Famicom Network System: Difference between revisions
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=System Overview= | =System Overview= | ||
The Famicom Network System is a complicated device with its own memory mapping system and internal CPU. The RF5C66 chip provides the main mapper functionality, delegating its own registers at $40A0, RF5A18 Famicom registers at $40D0, an internal Kanji ROM at $5000, an internal 8kByte W-RAM at $6000. It also controls the bank of a built-in | The Famicom Network System is a complicated device with its own memory mapping system and internal CPU. The RF5C66 chip provides the main mapper functionality, delegating its own registers at $40A0, RF5A18 Famicom registers at $40D0, an internal Kanji ROM at $5000, an internal 8kByte W-RAM at $6000. It also controls the bank of a built-in 16 KiB CHR RAM (using two 8 KiB CHR RAM chips). | ||
The RF5A18 contains CPU2, which is a 65'''<u>C</u>'''02 processor with its own independent CPU clock. It has a built-in 4kByte ROM. This chip is responsible for controlling the modem communications. It communicates with the Famicom CPU through four bidirectional registers at $40Dx. | The RF5A18 contains CPU2, which is a 65'''<u>C</u>'''02 processor with its own independent CPU clock. It has a built-in 4kByte ROM. This chip is responsible for controlling the modem communications. It communicates with the Famicom CPU through four bidirectional registers at $40Dx. | ||
The Famicom Network System plugs into the Famicom through its cartridge connector and provides the user a ZIF style slot to insert a | The Famicom Network System plugs into the Famicom through its cartridge connector and provides the user a ZIF style slot to insert a ''tsuushin card''. The card is similar to a normal cartridge but does not have access to any PPU signals. Commercial cards are observed to have their own MMC1 memory mapper, which does not interfere with any of the registers of the Famicom Network System. CPU R/W and the CPU data bus are routed through the RF5C66 chip before making it to the card and other internal hardware. It effectively blocks the Famicom Network System from driving the data bus for certain regions of memory, and possibly also is intended to act as a bidirectional buffer / signal conditioner. It is also used for blocking writes when the lid switch is open or when the CIC fails. Older revisions of Famicom Network System also buffered the Famicom address bus with 74HC541 chips, so it is plausible that signal conditioning was a concern. | ||
=LH5323M1 Kanji Graphic ROM= | =LH5323M1 Kanji Graphic ROM= | ||
Line 13: | Line 13: | ||
=Disk Drive Support= | =Disk Drive Support= | ||
According to a block diagram with potentially dubious origins, the RF5C66 chip contains a disk drive controller. Similar design in several ways to the Famicom Disk System, it is suspected that a disk drive can be connected to the expansion port and controlled by the RF5C66. Since this feature was never used, it is unknown how to use or activate it, or even if that feature is fully implemented. The original FDS has a large DRAM that is not present as a discrete chip in the Famicom Network System. It is unknown if such a DRAM could be already integrated into the RF5C66, or could be attached externally and simply not populated, or if a special card was to be constructed containing this RAM. All original FDS registers are notably absent and all discovered registers start immediately after where the FDS registers would normally be. There is no obvious path to produce FDS expansion audio. This remains a mystery presently. | According to a block diagram with potentially dubious origins, the RF5C66 chip contains a disk drive controller. Similar design in several ways to the Famicom Disk System, it is suspected that a disk drive can be connected to the expansion port and controlled by the RF5C66. Since this feature was never used, it is unknown how to use or activate it, or even if that feature is fully implemented. The original FDS has a large DRAM that is not present as a discrete chip in the Famicom Network System. It is unknown if such a DRAM could be already integrated into the RF5C66, or could be attached externally and simply not populated, or if a special tsuushin card was to be constructed containing this RAM. All original FDS registers are notably absent and all discovered registers start immediately after where the FDS registers would normally be. There is no obvious path to produce FDS expansion audio. This remains a mystery presently. | ||
One possibility if the RF5C66 follows a similar pinout to the FDS RP2C33: | One possibility if the RF5C66 follows a similar pinout to the FDS RP2C33: | ||
Line 27: | Line 27: | ||
=Memory Map= | =Memory Map= | ||
+================+ $0000 - | +================+ $0000 - Famicom Internam RAM | ||
| | | Famicom | | ||
| RAM | | Internal RAM | | ||
+----------------+ $0800 | +----------------+ $0800 | ||
| (Mirrors of | | | (Mirrors of | | ||
| $0000-$07FF) | | | $0000-$07FF) | | ||
+================+ $2000 - | +================+ $2000 - Famicom PPU Registers | ||
| | | Famicom PPU | | ||
| Registers | | | Registers | | ||
+----------------+ $2008 | +----------------+ $2008 | ||
| (Mirrors of | | | (Mirrors of | | ||
| $2000-$2007) | | | $2000-$2007) | | ||
+================+ $4000 - | +================+ $4000 - Famicom APU, IO, and Test Registers | ||
| | | FC APU and IO | | ||
| Registers | | | Registers | | ||
+----------------+ $4018 | +----------------+ $4018 | ||
| | | FC Test Mode | | ||
| Registers | | | Registers | | ||
+----------------+ $4020 | +----------------+ $4020 | ||
| (Open Bus) | | | (Open Bus) | | ||
+================+ $40A0 - Famicom | +================+ $40A0 - Famicom Network System Internal Registers | ||
| Famicom Modem | | | Famicom Modem | | ||
| RF5C66 | | | RF5C66 | | ||
Line 53: | Line 53: | ||
+----------------+ $40D0 | +----------------+ $40D0 | ||
| Famicom Modem | | | Famicom Modem | | ||
| RF5A18 | | RF5A18 (CPU2) | | ||
| Registers | | | Registers | | ||
+----------------+ $40D8 | +----------------+ $40D8 | ||
Line 59: | Line 59: | ||
| $40D0-$40D7) | | | $40D0-$40D7) | | ||
+----------------+ $40E0 | +----------------+ $40E0 | ||
| Unused Device | | |||
| Registers | | |||
| (Open Bus) | | |||
+----------------+ $40F0 | |||
| (Open Bus) | | | (Open Bus) | | ||
+----------------+ $4100 | +----------------+ $4100 | ||
Line 68: | Line 72: | ||
| (Mirrors of | | | (Mirrors of | | ||
| $4100-$41FF) | | | $4100-$41FF) | | ||
+================+ $5000 - Famicom | +================+ $5000 - Famicom Network System Internal Kanji ROM | ||
| | | FNS | | ||
| LH5323M1 | | | LH5323M1 | | ||
| Kanji ROM | | | Kanji ROM | | ||
+================+ $6000 - Famicom | +================+ $6000 - Famicom Network System Internal RAM and Tsuushin Card RAM | ||
| | | FNS | | ||
| Internal RAM | | | Internal RAM | | ||
+================+ $8000 - | +================+ $8000 - Tsuushin Card ROM Space | ||
| | | Tsuushin Card | | ||
| | | Space | | ||
| | | | | | ||
+================+ $10000 | +================+ $10000 | ||
==Data Bus Behavior== | |||
The CPU data bus is buffered in both directions through the RF5C66 chip before making it to the tsuushin card and other internal hardware, with the exception of the Kanji graphics ROM and the RF5C66's own registers, which sit directly on the CPU data bus. It appears that the buffer goes from CPU Data Bus to Card Data Bus, or Card Data Bus to CPU Data Bus only. There has not been a high-impedance state observed when testing each possible address in read and write directions on a standalone RF5C66 chip. The CPU Data Bus and Card Data Bus were always observed to be equal despite attaching opposite pull-up and pull-down resistors. | |||
When RF5C66 pin 29 is driven low by the master CIC chip's pin 11, it forces Card R/W always high, thereby preventing most RAM and register writes in the Famicom Network System. Potentially, the data bus buffer has an additional behavior in this mode in order to prevent bus conflicts. The lid switch also imposes such a behavior when the lid is open, but it does not appear that the RF5C66 has a way of knowing when the switch is open, so the bus conflicts do not appear to be prevented in that case. | |||
The propagation delay of the CPU data bus buffer and CPU R/W buffer are measured to be about 16 nsec. | |||
{| class=wikitable | |||
! Address Range !! Buffer Direction When Reading !! Buffer Direction When Writing !! Notes | |||
|- | |||
! $0x00-$4x1F | |||
| {{no|CPU -> Card}} || {{yes|CPU -> Card}} || Famicom internal RAM and registers | |||
|- | |||
! $4x20-$4x9F | |||
| {{no|CPU -> Card}} || {{yes|CPU -> Card}} || (unknown; [[FDS]] registers exactly fit here) | |||
|- | |||
! $4xA0-$4xCF | |||
| {{no|CPU -> Card}} || {{yes|CPU -> Card}} || RF5C66 registers | |||
|- | |||
! $4xD0-$4xDF | |||
| {{yes|CPU <- Card}} || {{yes|CPU -> Card}} || CPU 2 registers, /CE at RF5C66 pin 42 | |||
|- | |||
! $4xE0-$4xEF | |||
| {{yes|CPU <- Card}} || {{yes|CPU -> Card}} || Unused device registers, /CE at RF5C66 pin 41 | |||
|- | |||
! $4xF0-$4xFF | |||
| {{no|CPU -> Card}} || {{yes|CPU -> Card}} || (unknown) | |||
|- | |||
! $5x00-$5xFF | |||
| {{no|CPU -> Card}} || {{yes|CPU -> Card}} || Kanji graphic ROM, /CE at RF5C66 pin 50 | |||
|- | |||
! $6x00-$7xFF | |||
| {{yes|CPU <- Card}} || {{yes|CPU -> Card}} || Famicom Network System internal RAM, /CE at RF5C66 pin 40 | |||
|- | |||
! $8x00-$FxFF | |||
| {{yes|CPU <- Card}} || {{yes|CPU -> Card}} || Tsuushin card, /CE is /ROMSEL | |||
|- | |||
|} | |||
Note that address range $4xE0-$4xEF was meant for a second device similar to CPU 2. Since that device doesn't exist, a tsuushin card could theoretically exploit those 256 addresses for its own purposes; for example, its own read/write registers. | |||
=Known Registers= | =Known Registers= | ||
Line 91: | Line 136: | ||
!|Function | !|Function | ||
|- | |- | ||
|$ | |$40A0 | ||
|{{unknown}} | |{{unknown}} | ||
|{{ | |{{no}} | ||
|{{unknown}} | |{{unknown}} | ||
|RF5C66 | |RF5C66 | ||
| | |No evidence has been found that this register does or does not exist. It is possible that it is a write-only register that is not used by any known Famicom Network System card. No reads or writes to this register were ever observed to have any effect. However, its apparent absence is suspicious enough to have this placeholder here. | ||
<pre> | <pre> | ||
Write | Write | ||
Line 104: | Line 149: | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
Line 110: | Line 155: | ||
|- | |- | ||
| | | | ||
*Bench test | *Bench test found open bus when reading this register. | ||
|} | |} | ||
|- | |- | ||
|$40A2 | |$40A1 | ||
|{{yes}} | |{{unknown}} | ||
|{{yes}} | |||
|{{unknown}} | |||
|RF5C66 | |||
|Unknown Function. | |||
<pre> | |||
Write | |||
76543210 | |||
++++++++-- (unknown) | |||
Read | |||
76543210 | |||
++++++++-- Bits exist but function is unknown | |||
</pre> | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |||
| | |||
*Bench test observed value $FF with pull-downs. | |||
*Test code writing values $01,02,04,08,10,20,40,80 always read back $FF after each write. | |||
|} | |||
|- | |||
|$40A2 | |||
|{{yes}} | |||
|{{yes}} | |{{yes}} | ||
|{{unknown}} | |{{unknown}} | ||
Line 129: | Line 196: | ||
|||||||+-- Timer Interrupt (1: an IRQ occurred) | |||||||+-- Timer Interrupt (1: an IRQ occurred) | ||
||||||+--- Bit exists but function is unknown | ||||||+--- Bit exists but function is unknown | ||
||||++---- | ||||++---- (unlikely to exist) | ||
++++------ Bits exist but function is unknown | ++++------ Bits exist but function is unknown | ||
</pre> | </pre> | ||
Line 160: | Line 227: | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*Various values written to this register affect the behavior of pulses on pin 79. | *Various values written to this register affect the behavior of pulses on pin 79. | ||
Line 188: | Line 255: | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*Note: Reading test should be repeated with pull-ups and pull-downs on expansion pins. | *Note: Reading test should be repeated with pull-ups and pull-downs on expansion pins. | ||
Line 215: | Line 282: | ||
||||||+--- Input value of EXP 8 | ||||||+--- Input value of EXP 8 | ||
|||||+---- Input value of EXP 7 | |||||+---- Input value of EXP 7 | ||
|++++----- | |++++----- (unlikely to exist) | ||
+--------- Input value of EXP 11 | +--------- Input value of EXP 11 | ||
</pre> | </pre> | ||
Line 278: | Line 345: | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*Writing anything to this register resets the cycle counter to the reload value. | *Writing anything to this register resets the cycle counter to the reload value. | ||
Line 361: | Line 428: | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*Reading this register resets the value of $40A9 back to $00. | *Reading this register resets the value of $40A9 back to $00. | ||
Line 386: | Line 453: | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*Reading this register prevents timed toggle on RF5C66-69 (see notes in pinout). | *Reading this register prevents timed toggle on RF5C66-69 (see notes in pinout). | ||
Line 415: | Line 482: | ||
Read | Read | ||
76543210 | 76543210 | ||
|+++++++-- | |+++++++-- (unlikely to exist) | ||
+--------- Present value of CIRAM A10 | +--------- Present value of CIRAM A10 | ||
</pre> | </pre> | ||
Line 445: | Line 512: | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*Refer also to $40C0.0 for built-in RAM enabling. | *Refer also to $40C0.0 for built-in RAM enabling. | ||
Line 475: | Line 542: | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*All reads reset the Kanji auto-increment counter. | *All reads reset the Kanji auto-increment counter. | ||
Line 555: | Line 622: | ||
||||| See also $40B1.3. | ||||| See also $40B1.3. | ||
||||+----- Pin 5C66.38 = $40C0.3 (POR value = 0) | ||||+----- Pin 5C66.38 = $40C0.3 (POR value = 0) | ||
|||| CHR | |||| CHR RAM Bank Select (selects between two 8 KiB CHR RAM chips) | ||
++++------ (unknown) | ++++------ (unknown) | ||
Line 568: | Line 635: | ||
||||+----- Input value of pin 5C66.34: | ||||+----- Input value of pin 5C66.34: | ||
|||| Selected CHR RAM Bank | |||| Selected CHR RAM Bank | ||
|+++------ | |+++------ (unlikely to exist) | ||
+--------- Input value of pin 5C66.29: | +--------- Input value of pin 5C66.29: | ||
Filtered Host CIC +Start | Filtered Host CIC +Start | ||
Line 682: | Line 749: | ||
Read | Read | ||
76543210 | 76543210 | ||
|||+++++-- | |||+++++-- (unlikely to exist) | ||
+++------- 3-bit value read here was written by CPU2 to register $4122. | +++------- 3-bit value read here was written by CPU2 to register $4122. | ||
</pre> | </pre> | ||
Line 706: | Line 773: | ||
|{{yes}} | |{{yes}} | ||
|RF5A18 | |RF5A18 | ||
| | |Tone Rx and Expansion I/O Control | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
|||||||+-- RF5A18 Pin 65 (Exp 17) = $40D4.0 ( | |||||||+-- RF5A18 Pin 65 (Exp 17) = $40D4.0 (open-drain) | ||
||||||+--- RF5A18 Pin 67 (Exp 19) = $40D4.1 ( | ||||||+--- RF5A18 Pin 67 (Exp 19) = $40D4.1 (push-pull) | ||
|||||+---- RF5A18 Pin 66 (Exp 18) = $40D4.2 ( | |||||+---- RF5A18 Pin 66 (Exp 18) = $40D4.2 (open-drain) | ||
+++++----- (unknown) | +++++----- (unknown) | ||
Read | Read | ||
76543210 | 76543210 | ||
|||||||+-- $40D4.0 = | |||||||+-- $40D4.0 = I/O value of RF5A18 Pin 65 (Exp 17) | ||
||||||+--- $40D4.1 = output value of RF5A18 Pin 67 (Exp 19) | ||||||+--- $40D4.1 = output value of RF5A18 Pin 67 (Exp 19) | ||
|||||+---- $40D4.2 = | |||||+---- $40D4.2 = I/O value of RF5A18 Pin 66 (Exp 18) | ||
||||+----- $40D4.3 = input value of RF5A18 Pin 69 (Tone Rx D1) | ||||+----- $40D4.3 = input value of RF5A18 Pin 69 (Tone Rx D1) | ||
|||+------ $40D4.4 = input value of RF5A18 Pin 70 (Tone Rx D2) | |||+------ $40D4.4 = input value of RF5A18 Pin 70 (Tone Rx D2) | ||
Line 741: | Line 808: | ||
|{{unknown}} | |{{unknown}} | ||
|RF5A18 | |RF5A18 | ||
| | |Clocks | ||
<pre> | <pre> | ||
Write | Write | ||
Line 750: | Line 817: | ||
76543210 | 76543210 | ||
||++++++-- Bits exist but function is unknown | ||++++++-- Bits exist but function is unknown | ||
++-------- | ++-------- (unlikely to exist) | ||
</pre> | </pre> | ||
*The purpose is unknown but it could potentially serve to generate random numbers. | *The purpose is unknown but it could potentially serve to generate random numbers. | ||
**The Famicom CPU and CPU2 have separate clocks and are asynchronous, making the value read especially random. | **The Famicom CPU and CPU2 have separate clocks and are asynchronous, making the value read especially random. | ||
*Bit 5 is a 0.05% duty square wave, measured 1.200kHz (19.6608MHz CPU2 crystal / 16384) | *Bit 5 is a 0.05% duty square wave, measured 1.200kHz (19.6608MHz CPU2 crystal / 16384) | ||
**Negative pulse width measures 406 nsec, the same as period of bit 2. | **Negative pulse width measures 406 nsec, the same as period of bit 2. | ||
*Bit 4 is a 50% duty square wave, measured 19.20kHz (19.6608MHz CPU2 crystal / 1024) | *Bit 4 is a 50% duty square wave, depending on $4114.1 and $4114.0: | ||
**(0,0) measured 19.20kHz (19.6608MHz CPU2 crystal / 1024) | |||
**(0,1) measured 38.40kHz (19.6608MHz CPU2 crystal / 512) | |||
**(1,0) measured 76.80kHz (19.6608MHz CPU2 crystal / 256) | |||
**(1,1) measured 153.6kHz (19.6608MHz CPU2 crystal / 128) | |||
*Bit 3 is a 50% duty square wave, measured 307.3kHz (19.6608MHz CPU2 crystal / 64) | *Bit 3 is a 50% duty square wave, measured 307.3kHz (19.6608MHz CPU2 crystal / 64) | ||
*Bit 2 is a 50% duty square wave, measured 2.451MHz (19.6608MHz CPU2 crystal / 8) | *Bit 2 is a 50% duty square wave, measured 2.451MHz (19.6608MHz CPU2 crystal / 8) | ||
*Bit 1 is a 50% duty square wave, measured 4.902MHz (19.6608MHz CPU2 crystal / 4) | *Bit 1 is a 50% duty square wave, measured 4.902MHz (19.6608MHz CPU2 crystal / 4) | ||
**This bit toggles at the same rate as RF5A18 pin 42, though there is a 129.9 degree phase difference. | |||
*Bit 0 is a 50% duty square wave, measured 9.804MHz (19.6608MHz CPU2 crystal / 2) | *Bit 0 is a 50% duty square wave, measured 9.804MHz (19.6608MHz CPU2 crystal / 2) | ||
*The phasing of these signals do not line up nicely but they do stay in perfect sync with CPU2. | *The phasing of these signals do not line up nicely but they do stay in perfect sync with CPU2 M2. | ||
| | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |||
|- | |- | ||
|$40D6 | | | ||
*$40Dx registers can be monitored in real-time by statically giving the RF5A18 the bus signals for a read from this register. | |||
**M2 = 1, Card R/W (i.e. buffered CPU R/W) = 1, Famicom /CE = 0, CPU A0,A1,A2 = x,x,x | |||
**Unimplemented bits will latch the Famicom data bus's last value when toggling M2. | |||
*Bits 7,6 follow pull-ups and downs on the data bus. | |||
|} | |||
|- | |||
|$40D6 | |||
|{{unknown}} | |{{unknown}} | ||
|{{yes}} | |{{yes}} | ||
|{{unknown}} | |{{unknown}} | ||
|RF5A18 | |RF5A18 | ||
| | |UART Status | ||
<pre> | <pre> | ||
Write | Write | ||
Line 783: | Line 857: | ||
Read | Read | ||
76543210 | 76543210 | ||
||||| | |||||||+-- Bit exists but function is unknown | ||
||||+----- | ||||||+--- $40D6.1 = !($4112.0) read by CPU2. (0 = $4110 UART Rx buffer has a byte ready to be read.) | ||
|||+------ | |||||+---- $40D6.2 = !($4112.1) read by CPU2. (0 = $4110 UART Tx buffer can be written.) | ||
||+------- | ||||+----- $40D6.3 = !($4113.1 OR $4113.2) written by CPU2. | ||
++-------- | |||+------ $40D6.4 = !($4113.7) written by CPU2. (1 = Transmit repeat.) | ||
||+------- $40D6.5 = !($4113.6) written by CPU2. | |||
++-------- (unlikely to exist) | |||
</pre> | </pre> | ||
$40D6.2 previously observed to equal !($4113.7 AND $4112.1) written by CPU2. It was later discovered that this bit also follows the $4112.1 read value (Tx buffer ready), which makes a lot more sense being beside $40D6.1 (Rx buffer ready). The previous observation can be explained because writing to those CPU2 bits both likely changed the availability of the Tx buffer. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 794: | Line 871: | ||
| | | | ||
*Bits 7,6 follow pull-ups and downs on the data bus. | *Bits 7,6 follow pull-ups and downs on the data bus. | ||
* | *Bit 0 only ever observed with value 1 regardless of various techniques writing to lots of CPU2 registers. | ||
*Writing a value to this register does not ''seem to'' cause | *Writing a value to this register does not ''seem to'' cause its own read value to change. | ||
|} | |} | ||
|- | |- | ||
Line 801: | Line 878: | ||
=RF5A18 Internal 65C02 CPU= | =RF5A18 Internal 65C02 CPU= | ||
The RF5A18 contains its own CPU, termed "CPU2" on this page. It is a 65C02 supporting bitwise set/clear/branch instructions. Note that CPU2 has its own parallel execution with its own address and data busses that are not available to the Famicom's CPU. CPU2 also has its own clock source, so it does not execute synchronously with the Famicom CPU. This section describes CPU2's own memory mapping and its own internal registers. | The RF5A18 contains its own CPU, termed "CPU2" on this page. It is a 65C02 supporting bitwise set/clear/branch instructions. Note that CPU2 has its own parallel execution with its own address and data busses that are not available to the Famicom's CPU. CPU2 also has its own clock source, so it does not execute synchronously with the Famicom CPU. CPU2 clock speed is 2.4576 MHz (19.6608 MHz crystal / 8). This section describes CPU2's own memory mapping and its own internal registers. | ||
CPU2 /Reset is controlled 2 different ways depending on the revision of Famicom Network System. To support all revisions when enabling CPU2, both of these bits should be written: | CPU2 /Reset is controlled 2 different ways depending on the revision of Famicom Network System. To support all revisions when enabling CPU2, both of these bits should be written: | ||
Line 808: | Line 885: | ||
==CPU2 Memory Map== | ==CPU2 Memory Map== | ||
===RF5A18 Pin 26 Low (default)=== | |||
+================+ $0000 | +================+ $0000 | ||
| CPU2 RAM | | | CPU2 RAM | | ||
Line 821: | Line 899: | ||
| last fetch) | | | last fetch) | | ||
+================+ $C000 | +================+ $C000 | ||
| | | External ROM | | ||
| | | (not used) | | ||
+================+ $E000 | +================+ $E000 | ||
| RF5A18 | | | RF5A18 | | ||
| Internal ROM | | | Internal ROM | | ||
+================+ $10000 | |||
===RF5A18 Pin 26 High=== | |||
+================+ $0000 | |||
| CPU2 RAM | | |||
| (U6) | | |||
+================+ $2000 | |||
| (Returns | | |||
| last fetch) | | |||
+================+ $4100 | |||
| CPU2 Control | | |||
| Registers | | |||
+================+ $4140 | |||
| (Returns | | |||
| last fetch) | | |||
+================+ $C000 | |||
| | | |||
| | | |||
| External ROM | | |||
| | | |||
| | | |||
+================+ $10000 | +================+ $10000 | ||
Line 837: | Line 936: | ||
|- | |- | ||
|$4100 | |$4100 | ||
|{{ | |{{no}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
| | |NMI Timer 1 Period, low byte. | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- NMI timer 1 period low byte. | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (does not exist) | ||
</pre> | </pre> | ||
*Time (seconds) * 1200 = 16-bit timer 1 register value. | |||
**1 count = 2048 CPU cycles. | |||
*This is the LSB of the 16-bit period. Refer to $4101 for the MSB. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 856: | Line 958: | ||
*Read Bit Existence: | *Read Bit Existence: | ||
**Values $41, $40, and $BF from previous fetch observed unaffected. | **Values $41, $40, and $BF from previous fetch observed unaffected. | ||
* | *When tone dialing, the digit length is $0078 (~100ms) and the inter-digit gap is $0046 (~60ms). | ||
* | *Slow pulse dialing uses on-hook pulses of $004f (~67ms) and off-hook gaps of $0027 (~33ms) and the inter-digit gap is $031e (~666ms). | ||
** | *Fast pulse dialing uses on-hook pulses of $0027 (~33ms) and off-hook gaps of $0013 (~17ms) and the inter-digit gap is $027e (~533ms). | ||
** | **The times are approximate and assume a 1200Hz clock source, but the actual clock source is unknown. | ||
***Theory: 19.6608MHz RF5A18 crystal / 2^14 = 1200Hz. | |||
|} | |} | ||
|- | |- | ||
|$4101 | |$4101 | ||
|{{ | |{{no}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
| | |NMI Timer 1 Period, high byte. | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- NMI timer 1 period high byte. | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (does not exist) | ||
</pre> | </pre> | ||
*Time (seconds) * 1200 = 16-bit timer 1 register value. | |||
**1 count = 2048 CPU cycles. | |||
*This is the MSB of the 16-bit period. Refer to $4100 for the LSB. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 882: | Line 988: | ||
*Read Bit Existence: | *Read Bit Existence: | ||
**Values $41, $40, and $BF from previous fetch observed unaffected. | **Values $41, $40, and $BF from previous fetch observed unaffected. | ||
|} | |} | ||
|- | |- | ||
|$4102 | |$4102 | ||
|{{ | |{{no}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
| | |NMI Timer 1 Restart. | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
|||||||+-- | |||||||+-- $4102.0 = timer 1 loop. 1 = Loop, 0 = One-Shot | ||
||||||+--- | ||||||+--- $4102.1 = timer 1 restart. 1 = Restart. | ||
++++++---- (unknown) | ++++++---- (unknown) | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (does not exist) | ||
</pre> | </pre> | ||
* | *When setting bit 1 = 1, timer 1 restarts with the period specified in $4100, $4101. | ||
*The values of $4100, $4101 are not affected by running timer 1 and need not be rewritten each time. | |||
* | *NMI will be generated when timer 1 expires if $412F.0 = 1. | ||
*The behavior is untested when setting bits 0 or 1 = 1 while timer 1 is already running. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 919: | Line 1,025: | ||
|{{yes}} | |{{yes}} | ||
|{{unknown}} | |{{unknown}} | ||
|NMI Acknowledge | |NMI Timer 1 Acknowledge. | ||
<pre> | <pre> | ||
Write | Write | ||
Line 927: | Line 1,033: | ||
Read | Read | ||
76543210 | 76543210 | ||
|||||||+-- | |||||||+-- $4103.0 = Timer 1 NMI flag. 1 = Timer 1 NMI triggered. | ||
+++++++--- ( | +++++++--- (does not exist) | ||
</pre> | </pre> | ||
*Reading from this register likely acknowledges | *Reading from this register likely acknowledges timer 1 NMI. | ||
* | *The read value of $4103.0 reflects the timer 1 NMI flag, but does not reflect external NMI via pin 29. | ||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 946: | Line 1,052: | ||
|- | |- | ||
|$4104 | |$4104 | ||
|{{ | |{{no}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
| | |IRQ Timer 2 Period, low byte. | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- IRQ timer 2 period low byte. | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (does not exist) | ||
</pre> | </pre> | ||
*Time (seconds) * 2,457,600 = 16-bit timer 2 register value. | |||
**1 count = 1 CPU cycle. | |||
*This is the LSB of the 16-bit period. Refer to $4105 for the MSB | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 969: | Line 1,078: | ||
|- | |- | ||
|$4105 | |$4105 | ||
|{{ | |{{no}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
| | |IRQ Timer 2 Period, high byte. | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- IRQ Timer 2 Period, high byte. | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (does not exist) | ||
</pre> | </pre> | ||
*Time (seconds) * 2,457,600 = 16-bit timer 2 register value. | |||
**1 count = 1 CPU cycle. | |||
*This is the MSB of the 16-bit period. Refer to $4104 for the LSB | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 992: | Line 1,104: | ||
|- | |- | ||
|$4106 | |$4106 | ||
|{{ | |{{no}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
| | |IRQ Timer 2 Restart. | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- (unknown) | |||||||+-- $4106.0 = timer 2 loop. 1 = Loop, 0 = One-Shot | ||
||||||+--- $4106.1 = timer 2 restart. 1 = Restart. | |||
++++++---- (unknown) | |||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (does not exist) | ||
</pre> | </pre> | ||
*Theory: When setting bit 1 = 1, timer 2 restarts with the period specified in $4100, $4101. | |||
*Theory: The values of $4104, $4105 are not affected by running timer 2 and need not be rewritten each time. | |||
*IRQ will be generated when timer 2 expires if $412F.6 = 1. | |||
*The behavior is untested when setting bits 0 or 1 = 1 while timer 2 is already running. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,019: | Line 1,137: | ||
|{{yes}} | |{{yes}} | ||
|{{unknown}} | |{{unknown}} | ||
|IRQ Acknowledge | |IRQ Timer 2 Acknowledge. | ||
<pre> | <pre> | ||
Write | Write | ||
Line 1,027: | Line 1,145: | ||
Read | Read | ||
76543210 | 76543210 | ||
|||||||+-- ( | |||||||+-- (unlikely to exist) | ||
||||||+--- | ||||||+--- Likely to be the Timer 2 IRQ flag | ||
++++++---- ( | ++++++---- (unlikely to exist) | ||
</pre> | </pre> | ||
*Reading from this register likely acknowledges | *Reading from this register likely acknowledges timer 2 IRQ. | ||
* | *$4107.1 is probably the timer 2 IRQ flag. | ||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,045: | Line 1,163: | ||
|- | |- | ||
|$4110 | |$4110 | ||
|{{yes}} | |{{yes}} | ||
|{{yes}} | |{{yes}} | ||
| | |{{yes}} | ||
|UART Rx/Tx Data Buffer | |||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- UART Tx Data Byte | ||
Bits 7:0 in 8-bit mode, bits 6:0 in 7-bit mode | |||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- UART Rx Data Byte | ||
Bits 7:0 in 8-bit mode, bits 6:0 in 7-bit mode | |||
</pre> | </pre> | ||
*Writing a byte to this register automatically clears $4112.1 read value and triggers the byte to be sent on UART Tx. | |||
*Reading a byte from this register automatically clears $4112.0 read value, to be triggered high again next byte received on UART Rx. | |||
*This UART is connected to the MSM6827L TXD and RXD pins. | |||
*The byte is ready to read here when the IRQ flag $4112.0 is high. | *The byte is ready to read here when the IRQ flag $4112.0 is high. | ||
*The byte is ready to be written here when flag $4112.1 is high. | *The byte is ready to be written here when flag $4112.1 is high. | ||
*Writes to $4110 are specifically prevented in modes 0 and 5. | *Writes to $4110 are specifically prevented by built-in ROM in modes 0 and 5. | ||
*Bench testing confirmed reads and writes of this register correspond to data read by UART Rx and written to UART Tx. | |||
**In 7-bit mode, Rx bit 7 (unused in this case) observed to be 0 but not confirmed always to be 0. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,071: | Line 1,196: | ||
**Value $BF from previous fetch observed changed to $00. ($BF XOR $00 = $BF existence mask) | **Value $BF from previous fetch observed changed to $00. ($BF XOR $00 = $BF existence mask) | ||
**$BE OR $41 OR $40 OR $BF = $FF accumulated existence mask. | **$BE OR $41 OR $40 OR $BF = $FF accumulated existence mask. | ||
*ROM $E69B reads from this address. | *ROM $E69B reads from this address inside of an IRQ handler, seemingly caused by its own IRQ, with flag at $4112.0. | ||
*ROM $E72F writes to this address. | *ROM $E72F writes to this address inside of an IRQ handler, which may have been caused by timer 2. | ||
*ROM $E754 writes to this address. | *ROM $E754 writes to this address inside of an IRQ handler, which may have been caused by timer 2. | ||
|} | |} | ||
|- | |- | ||
Line 1,080: | Line 1,205: | ||
|{{yes}} | |{{yes}} | ||
|{{yes}} | |{{yes}} | ||
| | |UART Configuration | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
|++++ | |||||||+-- $4111.0 = UART Rx Enable (1 = enabled) | ||
+--------- | ||||||+--- $4111.1 = UART Tx Enable (1 = enabled) | ||
|||||+---- $4111.2 = Baudrate Scaler (0 = multiply baudrate x4) | |||
||||+----- $4111.3 = Data bits (0 = 7 bits, 1 = 8 bits) | |||
|||+------ $4111.4 = Tx Stop bits (0 = 1 stop bit, 1 = 2 stop bits) | |||
||+------- $4111.5 = Parity bit (0 = don't use, 1 = append parity bit) | |||
|+-------- $4111.6 = Parity type (0 = odd parity, 1 = even parity) | |||
+--------- $4111.7 = Send Tx Break (1 = force UART Tx low (break), 0 = normal) | |||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- | ++++++++-- Reads back the value written. | ||
</pre> | </pre> | ||
*See register $4114 for baudrate table. | |||
*Confirmed write bits 2,3,5,6 apply to both Rx and Tx. | |||
*Write bit $4111.4 confirmed not to enforce 2 stop bits for UART Rx. | |||
**Consecutive Rx bytes with 1 stop bit separation can still be received when $4111.4 = 1. | |||
*Write bit $4111.7 requires manual operation to send a break character and has no effect on Rx operation. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,100: | Line 1,236: | ||
**Value $BF from previous fetch observed changed to $00. ($BF XOR $00 = $BF existence mask) | **Value $BF from previous fetch observed changed to $00. ($BF XOR $00 = $BF existence mask) | ||
**$41 OR $40 OR $BF = $FF accumulated existence mask. | **$41 OR $40 OR $BF = $FF accumulated existence mask. | ||
*ROM $E151 writes to this | *The built-in ROM function at $E1BC determines the UART settings to be written to this register. | ||
*ROM $ECE3 writes to this | **Clears bits 0,1,7. | ||
*ROM $ED20 writes | **Sets bit 2 (slow baudrate scaler). | ||
*ROM $ED4E | **Figures out bits 3,4,5,6 (UART bits/parity settings). | ||
*ROM $EE83 writes | **Returns that $4111 value in accumulator A. | ||
*ROM $F0E8 reads from this address, AND's it with #$FE, and writes it back to this | **Also sets baudrate to 1200 bits/sec by writing to $4114 before returning. | ||
*ROM $F2DC writes | *ROM $E151 runs $E1BC, sets bits [1,0] = 0,0, and writes it to this register. | ||
*ROM $ECE3 runs $E1BC, sets bits [1,0] = 1,1, and writes it to this register. | |||
*ROM $ED20 runs $E1BC, sets bits [1,0] = 0,1, and writes it to this register. | |||
*ROM $ED4E reads from this address, OR's it with #$03 (i.e. sets bits [1,0] = 1,1), and writes it back to this register. | |||
*ROM $EE83 runs $E1BC, sets bits [1,0] = 0,1, and writes it to this register. | |||
*ROM $F0E8 reads from this address, AND's it with #$FE (i.e. clears bit 7), and writes it back to this register. | |||
*ROM $F2DC runs $E1BC, sets bits [1,0] = 0,1, and writes it to this register. | |||
|} | |} | ||
|- | |- | ||
Line 1,113: | Line 1,255: | ||
|{{yes}} | |{{yes}} | ||
|{{yes}} | |{{yes}} | ||
| | |UART Status | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
|||||||+-- Bit exists but function is unknown | |||||||+-- Bit exists but function is unknown | ||
|++++++--- (unknown) | ||||||+--- $4112.1: Tx Silence | ||
+--------- $4112.7 = $4110 | |||||| 0 = Set UART Tx directly high (idle state), 1 = Allow sending data. | ||
|||||| This bit figures into $40D6.2 read by the Famicom. (See register $40D6.) | |||
|+++++---- (unknown) | |||
+--------- $4112.7 = $4110 UART Rx Data IRQ Acknowledge, 1 = Acknowledge IRQ. | |||
Read | Read | ||
76543210 | 76543210 | ||
|||||||+-- $4112.0 = $4110 | |||||||+-- $4112.0 = $4110 UART Rx Buffer Ready Flag (1 = $4110 buffer has a byte ready to be read.) | ||
||||||+--- $4112.1 = $4110 | ||||||+--- $4112.1 = $4110 UART Tx Buffer Ready Flag (1 = $4110 buffer can be written.) | ||
++++++---- | |||||+---- $4112.2 = UART Tx Idle, 1 = Idle, 0 = Active. | ||
||||+----- Bit exists but function is unknown | |||
|||+------ $4112.4 = Rx Parity Error. (1 = error detected) | |||
||+------- $4112.5 = Rx Framing Error. (1 = error detected) | |||
|+-------- $4112.6 = Rx Break Received. (1 = break detected) | |||
+--------- Bit exists but function is unknown | |||
</pre> | </pre> | ||
* | *Error and Break bits persist through $4110 operations, but can be cleared by writing 1 to $4112.7. | ||
*Found $4112.4 read became 1 when setting in parity mode ($4111.5 = 1) and injecting a wrong parity bit. | |||
**Confirmed this flag not getting set anymore with the same test when changing parity even/odd (i.e. inverted $4111.6). | |||
*$4112.6 = 1 (break) comes accompanied with $4112.5 = 1 (framing error). | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,148: | Line 1,301: | ||
*ROM $EE7B writes value #$81 to this address. | *ROM $EE7B writes value #$81 to this address. | ||
*ROM $F2D4 writes value #$81 to this address. | *ROM $F2D4 writes value #$81 to this address. | ||
*ROM $E4F2 uses read bit 0. | |||
*ROM $E67C uses read bit 5. | |||
*ROM $E68E uses read bit 4. | |||
*ROM $E703 uses read bit 1. | |||
|} | |} | ||
|- | |- | ||
Line 1,154: | Line 1,312: | ||
|{{yes}} | |{{yes}} | ||
|{{yes}} | |{{yes}} | ||
| | |UART Configuration | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
||++++++-- (unknown) | |||||||+-- (unknown) | ||
++-------- | ||||||+--- $4113.1 figures into $40D6.3 read by the Famicom. (See register $40D6.) | ||
|||||+---- $4113.2 figures into $40D6.3 read by the Famicom. (See register $40D6.) | |||
||+++----- (unknown) | |||
|+-------- $4113.6 figures into $40D6.5 read by the Famicom. (See register $40D6.) | |||
+--------- $4113.7: Tx Repeat | |||
1 = Send once on pin 90 (UART Tx), 0 = Send repeatedly | |||
This figures into $40D6.2 and $40D6.4 read by the Famicom. (See register $40D6.) | |||
Read | Read | ||
Line 1,165: | Line 1,329: | ||
++++++++-- Bits exist but function is unknown | ++++++++-- Bits exist but function is unknown | ||
</pre> | </pre> | ||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
|- | |- | ||
| | | | ||
*Writing to Bit 4 appeared to have an effect in some tests, apparently sending only 1 bit on the UART Tx, but this was not able to be reproduced in later tests. | |||
*Read Bit Existence: | *Read Bit Existence: | ||
**Value $41 from previous fetch observed changed to $10. ($41 XOR $10 = $51 existence mask) | **Value $41 from previous fetch observed changed to $10. ($41 XOR $10 = $51 existence mask) | ||
Line 1,188: | Line 1,352: | ||
|$4114 | |$4114 | ||
|{{unknown}} | |{{unknown}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
| | |UART Baudrate | ||
<pre> | <pre> | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- (unknown) | ||||||++-- UART Baud Rate (Rx and Tx) | ||
|||||| This is a clock divider that also affects frequency seen on $40D5.4. | |||
++++++---- (unknown) | |||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
{| | *Baud Rate Selection: | ||
| | {|class="wikitable" | ||
!|$4111.2 | |||
!|$4114.1 | |||
!|$4114.0 | |||
!|Baudrate | |||
|- | |- | ||
| | |0 | ||
|0 | |||
|0 | |||
|1200 | |||
| | |||
|- | |- | ||
| | |0 | ||
| | |0 | ||
| | |1 | ||
| | |2400 | ||
| | |- | ||
|0 | |||
|1 | |||
|0 | |||
||||||| | |4800 | ||
| | |- | ||
|||| | |0 | ||
|||| | |1 | ||
| | |1 | ||
|| | |9600 | ||
| | |- | ||
|1 | |||
|0 | |||
|0 | |||
|300 | |||
| | |- | ||
|1 | |||
|0 | |||
|1 | |||
| | |600 | ||
|- | |||
|1 | |||
|1 | |||
|0 | |||
|1200 | |||
|- | |||
|1 | |||
|1 | |||
|1 | |||
|2400 | |||
|- | |- | ||
|} | |} | ||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |- | ||
|$ | | | ||
|{{unknown}} | *$40D5.4 shows these frequencies depending on $4114 bits 1 and 0: | ||
|{{yes}} | **(0,0) measured 19.20kHz (19.6608MHz CPU2 crystal / 1024) | ||
|{{yes}} | **(0,1) measured 38.40kHz (19.6608MHz CPU2 crystal / 512) | ||
|Unknown Function. | **(1,0) measured 76.80kHz (19.6608MHz CPU2 crystal / 256) | ||
<pre> | **(1,1) measured 153.6kHz (19.6608MHz CPU2 crystal / 128) | ||
*Note: $40D5.4 is not affected by $4111.2. | |||
*Read Bit Existence: | |||
**Values $41, $40, $FF, and $BF from previous fetch observed unaffected. | |||
*ROM $E1DE writes value #$02 to this address. | |||
|} | |||
|- | |||
|$4120 | |||
|{{unknown}} | |||
|{{yes}} | |||
|{{yes}} | |||
|Unknown Function. | |||
<pre> | |||
Write | Write | ||
76543210 | 76543210 | ||
|||||||+-- Pin 32 ( | |||||||+-- Pin 39 (MSM6827L AD0) = $4120.0 | ||
+ | ||||||+--- Pin 38 (MSM6827L AD1) = $4120.1 | ||
|||||+---- Pin 37 (n/c) = $4120.2 | |||
||||+----- Pin 36 (MSM6827L /RD) = $4120.3 | |||
|||+------ Pin 35 (MSM6827L /WR) = $4120.4 | |||
||+------- Pin 34 (MSM6827L EXCLK) = $4120.5 | |||
|+-------- Pin 32 (MSM6827L Data): Direction = $4120.6: 1 = input, 0 = output (refer to $4121.0) | |||
+--------- (unknown) | |||
Read | Read | ||
76543210 | 76543210 | ||
|+++++++-- Bits exist but function is unknown | |||
+--------- $4120.7 = Pin 33 (MSM6827L /INT) | |||
</pre> | </pre> | ||
*When pin 32 is set as input, it is unknown if or how the value can be read. | |||
*Pin 32 floats in input mode, regardless of the value written to $4121.0. | |||
*When pin 32 is set as output, it is a push-pull output. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,277: | Line 1,462: | ||
**Value $41 from previous fetch observed changed to $FF. ($41 XOR $FF = $BE existence mask) | **Value $41 from previous fetch observed changed to $FF. ($41 XOR $FF = $BE existence mask) | ||
**Value $40 from previous fetch observed changed to $FF. ($40 XOR $FF = $BF existence mask) | **Value $40 from previous fetch observed changed to $FF. ($40 XOR $FF = $BF existence mask) | ||
**Value $BF from previous fetch observed changed to $FF. ($BF XOR $FF = $40 existence mask) | **Value $BF from previous fetch observed changed to $FF. ($BF XOR $FF = $40 existence mask) | ||
**$BE OR $BF OR $40 = $FF accumulated existence mask. | **$BE OR $BF OR $40 = $FF accumulated existence mask. | ||
*ROM $ | *Sequence: | ||
*ROM $ | **ROM $E3BC writes value #$38 to this address. | ||
**ROM $E3C7 writes value #$38 & #$DF = #$18 to this address. | |||
**ROM $E3CC writes value #$18 | #$20 = #$38 to this address. | |||
**ROM $E3D4 writes value #$38 & #$DF = #$18 to this address. | |||
**ROM $E3D9 writes value #$18 & #$EF = #$08 to this address. | |||
**ROM $E3DE writes value #$08 | #$10 = #$18 to this address. | |||
**ROM $E3E3 writes value #$58 to this address. | |||
*ROM $E3E9 writes value #$5A to this address. | |||
*ROM $E3EE writes value #$52 to this address. | |||
*ROM $E3F5 writes value #$72 to this address. | |||
*ROM $E3FA writes value #$52 to this address. | |||
*ROM $E402 writes value #$72 to this address. | |||
|} | |} | ||
|- | |- | ||
|$4122 | |$4121 | ||
|{{unknown}} | |||
|{{yes}} | |||
|{{yes}} | |||
|Unknown Function. | |||
<pre> | |||
Write | |||
76543210 | |||
|||||||+-- Pin 32 (MSM6827L Data) = $4121.0 when set as output (refer to $4120.6) | |||
+++++++--- (unknown) | |||
Read | |||
76543210 | |||
++++++++-- Bits exist but function is unknown | |||
</pre> | |||
*Reading $4121.0 reflects the value written to $4121.0 when $4120.6 is set as output. | |||
*Surprisingly, reading $4121.0 is always 1 when $4120.6 is set as input regardless of: | |||
**Driving pin 32 high or low. | |||
**Writing 1 or 0 to $4121.0. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |||
| | |||
*Read Bit Existence: | |||
**Value $41 from previous fetch observed changed to $FF. ($41 XOR $FF = $BE existence mask) | |||
**Value $40 from previous fetch observed changed to $FF. ($40 XOR $FF = $BF existence mask) | |||
**Value $FF from previous fetch observed unaffected. | |||
**Value $BF from previous fetch observed changed to $FF. ($BF XOR $FF = $40 existence mask) | |||
**$BE OR $BF OR $40 = $FF accumulated existence mask. | |||
*ROM $E3BF writes to this address. | |||
*ROM $E405 reads this address. | |||
|} | |||
|- | |||
|$4122 | |||
|{{unknown}} | |{{unknown}} | ||
|{{yes}} | |{{yes}} | ||
Line 1,292: | Line 1,520: | ||
Write | Write | ||
76543210 | 76543210 | ||
|||+++++-- ( | |||+++++-- (unlikely to exist) | ||
+++------- 3-bit value written here can be read by Famicom CPU from register $40D3. | +++------- 3-bit value written here can be read by Famicom CPU from register $40D3. | ||
Read | Read | ||
76543210 | 76543210 | ||
|||+++++-- ( | |||+++++-- (unlikely to exist) | ||
+++------- 3-bit value read here was written by Famicom CPU to register $40D3. | +++------- 3-bit value read here was written by Famicom CPU to register $40D3. | ||
</pre> | </pre> | ||
Line 1,461: | Line 1,689: | ||
</pre> | </pre> | ||
*SW1 selects between pulse and DTMF dialing. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,485: | Line 1,714: | ||
|$4127 | |$4127 | ||
|{{unknown}} | |{{unknown}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
|Unknown Function. | |Unknown Function. | ||
Line 1,491: | Line 1,720: | ||
Write | Write | ||
76543210 | 76543210 | ||
|||||||+-- Pin 56 | |||||||+-- Pin 56 MSM6827L +Reset = $4127.0 | ||
||||||+--- Pin 57 | ||||||+--- Pin 57 /Red LED = $4127.1 | ||
|||||+---- Pin 58 | |||||+---- Pin 58 /Green LED = $4127.2 | ||
||||+----- Pin 59 (n/c) = $4127.3 | ||||+----- Pin 59 (n/c) = $4127.3 | ||
|||+------ Pin 60 | |||+------ Pin 60 /Phone Off Hook = $4127.4 | ||
||+------- Pin 61 | ||+------- Pin 61 /DTMF Output Enable = $4127.5 | ||
|+-------- Pin 62 | |+-------- Pin 62 /Phone Audio Enable = $4127.6 | ||
+--------- Pin 63 (Modem P4-19) = $4127.7 | +--------- Pin 63 (Modem P4-19) = $4127.7 | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*Pin 60 observed low corresponding to off hook and pulse dialing pulses. | |||
*Pin 61 observed low for the duration of DTMF numbers being dialed, but not in pulse mode. | |||
*Pin 62 observed low corresponding to modem sounds coming through the TV speakers. | |||
*Pin 63 observed always high. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,511: | Line 1,744: | ||
**Values $41, $40, $FF, and $BF from previous fetch observed unaffected. | **Values $41, $40, $FF, and $BF from previous fetch observed unaffected. | ||
*ROM implements a shadow write register at $0014. | *ROM implements a shadow write register at $0014. | ||
*ROM $E237 writes | *ROM $E237 writes the shadow register $0014 to this register, modified bit 6 (/Phone Audio Enable). | ||
*ROM $E24D writes | *ROM $E24D writes the shadow register $0014 to this register, modified bit 7 (Modem P4-19). | ||
*ROM $E263 writes | *ROM $E263 writes the shadow register $0014 to this register, modified bit 4 (/Phone Off Hook). | ||
*ROM $E27D writes | *ROM $E27D writes the shadow register $0014 to this register, modified bit 1 (/Red LED). | ||
*ROM $E29A writes | *ROM $E29A writes the shadow register $0014 to this register, modified bit 2 (/Green LED). | ||
*ROM $E3B0 writes | *ROM $E3B0 writes the shadow register $0014 to this register, modified bit 5 (/DTMF Output Enable). | ||
*ROM $E987 writes | *ROM $E987 writes the shadow register $0014 to this register, modified bit 4 (/Phone Off Hook). | ||
*ROM $EA83 writes | *ROM $EA83 writes the shadow register $0014 to this register, modified bit 4 (/Phone Off Hook). | ||
*ROM $F3BF writes value #$FF to this | *ROM $F3BF writes value #$FF directly to this register, then clears bit 0 with value #$FE via the shadow register $0014. | ||
|} | |} | ||
|- | |- | ||
Line 1,535: | Line 1,768: | ||
Read | Read | ||
76543210 | 76543210 | ||
|||||+++-- ( | |||||+++-- (unlikely to exist) | ||
||||+----- $4128.3 = Pin 69 (Tone Rx D1) | ||||+----- $4128.3 = Pin 69 (Tone Rx D1) | ||
|||+------ $4128.4 = Pin 70 (Tone Rx D2) | |||+------ $4128.4 = Pin 70 (Tone Rx D2) | ||
Line 1,602: | Line 1,835: | ||
Write | Write | ||
76543210 | 76543210 | ||
|||||||+-- | |||||||+-- $412F.0 = Timer 1 NMI enable. 1 = Enabled. | ||
||+++++--- ( | ||||+++--- (unknown) | ||
++-------- | |||+------ $412F.4 = Pin 33 (MSM6827L /INT) IRQ enable. 1 = Enabled. | ||
||+------- $412F.5 = Pin 73 (Tone Rx DV) IRQ enable. 1 = Enabled. | |||
|+-------- $412F.6 = Timer 2 IRQ enable. 1 = Enabled. | |||
+--------- $412F.7 = UART Rx IRQ enable. 1 = Enabled. | |||
Read | Read | ||
76543210 | 76543210 | ||
|||||||+-- Bit exists but function is unknown | |||||||+-- Bit exists but function is unknown | ||
|||||++--- ( | |||||++--- (unlikely to exist) | ||
||||+----- Bit exists but function is unknown | ||||+----- Bit exists but function is unknown | ||
|||+------ $412F.4 = !(Pin 33) ( | |||+------ $412F.4 = !(Pin 33) (MSM6827L /INT) | ||
||+------- | ||+------- $412F.5 is set when IRQ is triggered by writing 1 to $412F.5. | ||
|| This is probably the Tone Rx DV interrupt flag. | |||
|+-------- $412F.6 is an IRQ flag. 1 = IRQ pending. | |+-------- $412F.6 is an IRQ flag. 1 = IRQ pending. | ||
+--------- Bit exists but function is unknown | +--------- Bit exists but function is unknown | ||
</pre> | </pre> | ||
*ROM tends to clear $412F.0 immediately after disabling interrupts with SEI, and sets it right before enabling with CLI. | *ROM tends to clear $412F.0 immediately after disabling interrupts with SEI, and sets it right before enabling with CLI. | ||
**The ROM is apparently disabling/enabling both IRQs and the timer NMI this way. | |||
*None of the write bits in this register prevent external NMI generated from pin 29 low. | |||
*None of the write bits prevent exteral IRQ generated from pin 28 low either. | |||
*Pin 33 (MSM6827L /INT) low triggers interrupt. | |||
*Pin 73 (Tone Rx DV) high triggers interrupt. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,630: | Line 1,872: | ||
*ROM implements a shadow write register at $0016. | *ROM implements a shadow write register at $0016. | ||
*ROM $E31C clears bit 0 of this register. | *ROM $E31C clears bit 0 of this register. | ||
*ROM $E33B writes to this address. | *ROM $E33B writes to this address, setting bit 0 to 1. | ||
*ROM $E4D3 reads from this address in the IRQ handler and uses bit 6. | *ROM $E4D3 reads from this address in the IRQ handler and uses bit 6. | ||
*ROM $F377 writes value #$00 to this address. | *ROM $F377 writes value #$00 to this address. | ||
*ROM $F40A writes value #$C1 to this address. | *ROM $F40A writes value #$C1 to this address. | ||
*ROM $F4E1 writes value #$00 to this address. | *ROM $F4E1 writes value #$00 to this address. | ||
*ROM $F4E9 writes to this address. | *ROM $F4E9 writes the shadow register to this address. | ||
*ROM $F99C writes value #$00 to this address. | *ROM $F99C writes value #$00 to this address. | ||
*Bits 7, 6, and 0 differ in values written, suggesting that they exist. | *Bits 7, 6, and 0 differ in values written, suggesting that they exist. | ||
Line 1,642: | Line 1,884: | ||
|$4130 | |$4130 | ||
|{{unknown}} | |{{unknown}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
|Unknown Function. | |Unknown Function. | ||
Line 1,648: | Line 1,890: | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- (unknown) | |||||||+-- Serial bit to be written | ||
+++++++--- (unknown, unlikely to exist) | |||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*The buffer at RAM $0330 is written to this register 1 bit at a time, seemingly using only bit 0 of the register. | |||
*The most significant bit of each byte is sent first. | |||
*40 bytes are sent from $0330, then only the 6 most significant bits of the 41st byte. | |||
**A total of 326 bits are sent to this register. | |||
*Note: CPU2 commands $10 and $11 fill this buffer. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,666: | Line 1,914: | ||
|$4131 | |$4131 | ||
|{{unknown}} | |{{unknown}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
|Unknown Function. | |Unknown Function. | ||
Line 1,672: | Line 1,920: | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- (unknown) | |||||||+-- Serial bit to be written | ||
+++++++--- (unknown, unlikely to exist) | |||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*The buffer at RAM $0360 is written to this register 1 bit at a time, seemingly using only bit 0 of the register. | |||
*The most significant bit of each byte is sent first. | |||
*40 bytes are sent from $0360, then only the 6 most significant bits of the 41st byte. | |||
**A total of 326 bits are sent to this register. | |||
*Note: CPU2 commands $10, $11, and $6A fill this buffer. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,690: | Line 1,944: | ||
|$4132 | |$4132 | ||
|{{unknown}} | |{{unknown}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
|Unknown Function. | |Unknown Function. | ||
Line 1,696: | Line 1,950: | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- (unknown) | |||||||+-- Serial bit to be written | ||
+++++++--- (unknown, unlikely to exist) | |||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*The buffer at RAM $0390 is written to this register 1 bit at a time, seemingly using only bit 0 of the register. | |||
*The most significant bit of each byte is sent first. | |||
*40 bytes are sent from $0390, then only the 6 most significant bits of the 41st byte. | |||
**A total of 326 bits are sent to this register. | |||
*Note: CPU2 commands $10, $11, and $6A fill this buffer. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,714: | Line 1,974: | ||
|$4133 | |$4133 | ||
|{{unknown}} | |{{unknown}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
|Unknown Function. | |Unknown Function. | ||
Line 1,720: | Line 1,980: | ||
Write | Write | ||
76543210 | 76543210 | ||
++++++++-- (unknown) | |||||||+-- Serial bit to be written | ||
+++++++--- (unknown, unlikely to exist) | |||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*The buffer at RAM $0320 is written to this register 1 bit at a time, seemingly using only bit 0 of the register. | |||
*The most significant bit of each byte is sent first. | |||
*4 bytes are sent from $0320, then only the 4 most significant bits of the 5th byte. | |||
**A total of 36 bits are sent to this register. | |||
*Note: CPU2 commands $10 and $11 fill this buffer. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,737: | Line 2,003: | ||
|- | |- | ||
|$4134 | |$4134 | ||
|{{ | |{{yes}} | ||
|{{yes}} | |{{yes}} | ||
|{{unknown}} | |{{unknown}} | ||
Line 1,749: | Line 2,015: | ||
76543210 | 76543210 | ||
|||||||+-- Bit exists but function is unknown | |||||||+-- Bit exists but function is unknown | ||
+++++++--- ( | +++++++--- (unlikely to exist) | ||
</pre> | </pre> | ||
*This register has serial data that can be read 1 bit at a time from $4134.0. | |||
**Without any other register reads/writes, the next bit is provided the next time this register is read. | |||
*In each byte read, the most significant bit comes first. | |||
*CPU2 built-in ROM reads 40 bytes this way and stores them starting at RAM $03C0. | |||
**Then 6 additional bits are read and stored as the 41st byte bits 7:2, and 0 for bits 1:0. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,776: | Line 2,047: | ||
Read | Read | ||
76543210 | 76543210 | ||
|||||||+-- | |||||||+-- $4135.0 = $4134 Serial Data Ready (1 = ready) | ||
+++++++--- ( | +++++++--- (unlikely to exist) | ||
</pre> | </pre> | ||
*If $4135.0 = 1, Built-in ROM proceeds to read the serial data from $4134. | |||
*Note: Built-in ROM only treats this register as a flag and does not treat it as serial data. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,793: | Line 2,066: | ||
|$4136 | |$4136 | ||
|{{unknown}} | |{{unknown}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
|Unknown Function. | |Unknown Function. | ||
Line 1,803: | Line 2,076: | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*Built-in ROM writes #$00 to $4137, then writes serial data to $4130, $4131, $4132, $4133, then writes #$00 to this register. | |||
*Theory: This is a "start" flag that starts using new data from $4130-4133 when the flag is cleared. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,816: | Line 2,091: | ||
|$4137 | |$4137 | ||
|{{unknown}} | |{{unknown}} | ||
|{{ | |{{no}} | ||
|{{yes}} | |{{yes}} | ||
|Unknown Function. | |Unknown Function. | ||
Line 1,826: | Line 2,101: | ||
Read | Read | ||
76543210 | 76543210 | ||
++++++++-- ( | ++++++++-- (unlikely to exist) | ||
</pre> | </pre> | ||
*Built-in ROM writes #$00 to this register, then writes serial data to $4130, $4131, $4132, $4133, then writes #$00 to $4136. | |||
*Theory: This is a "clear" flag that resets write bit counters and/or clears old data from $4130-4133 when the flag is cleared. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |Reference Data | ||
Line 1,879: | Line 2,156: | ||
|$83 | |$83 | ||
|This command is received by the Famicom in response to writing to command $03. (See next section for details.) | |This command is received by the Famicom in response to writing to command $03. (See next section for details.) | ||
|- | |||
|$90 | |||
|This command is received by the Famicom in response to writing to command $10. (See next section for details.) | |||
|- | |||
|$91 | |||
|This command is received by the Famicom in response to writing to command $11. (See next section for details.) | |||
|- | |- | ||
|$92 | |$92 | ||
Line 1,884: | Line 2,167: | ||
|- | |- | ||
|$C0 | |$C0 | ||
| | |UART Rx Packet | ||
There are 2 different parts of the CPU2 code that can send this message: | There are 2 different parts of the CPU2 code that can send this message: | ||
<pre>[$C0] [count=N] [parameter] [...N bytes...]</pre> | <pre>[$C0] [count=N] [parameter] [...N bytes...]</pre> | ||
Line 1,891: | Line 2,174: | ||
*[...N bytes...] are read from register $4110, most recent reads first, 1 byte read from $4110 per IRQ. | *[...N bytes...] are read from register $4110, most recent reads first, 1 byte read from $4110 per IRQ. | ||
*Count N does not include the parameter byte. | *Count N does not include the parameter byte. | ||
* | *This is serial data received from the Oki MSM6827L integrated modem chip. | ||
*This response can only happen in mode 2 via IRQ. | *This response can only happen in mode 2 via IRQ. | ||
<br/> | <br/> | ||
Line 1,951: | Line 2,234: | ||
|>= 0<br/><= 60 | |>= 0<br/><= 60 | ||
|0 | |0 | ||
| | |Hook And Dialing Sequence Configuration | ||
<pre>Message Bytes: | <pre>Message Bytes: | ||
[$00] [count=N] [xx] [...N bytes...] | [$00] [count=N] [xx] [...N bytes command string...] | ||
Response: | Response: | ||
Line 1,959: | Line 2,242: | ||
*[xx] byte is ignored. | *[xx] byte is ignored. | ||
*All observed software uses this command when opening a connection. | *All observed software uses this command when opening a connection. | ||
* | *Changes to Command Mode 1 when the full message has been received from the Famicom. | ||
** | *[command string] is a series of one-byte commands executed in Command Mode 1. | ||
** | **$00-$1F: ignored | ||
** | **$20: wait up to 3 seconds for call progress (dial) tone to stop | ||
** | ***Fails with status $03 if the tone never stops | ||
* | **$21: switch to DTMF dialing | ||
**$22: switch to normal (10pps) pulse dialing | |||
**$23: switch to fast (20pps) pulse dialing | |||
**$24: turn on audio output | |||
**$25: turn off audio output | |||
**$26: disconnect phone line (on hook) | |||
**$27: connect phone line (off hook) | |||
**$28-$2F: ignored | |||
**$30: dial 0 (10 pulses) | |||
**$31-$39: dial 1-9 (1-9 pulses) | |||
**$3A: dial D (no pulses) | |||
**$3B: dial * (11 pulses) | |||
**$3C: dial # (12 pulses) | |||
**$3D: dial A (13 pulses) | |||
**$3E: dial B (14 pulses) | |||
**$3F: dial C (15 pulses) | |||
**$40-7F: currently unknown, but not ignored | |||
**$80-FF: delay 0.2-25.6 seconds (in 200ms increments) | |||
Response: | Response: | ||
*[connection status] comes from RAM $0052, see section below for enumerated values. | *[connection status] comes from RAM $0052, see section below for enumerated values. | ||
**When successful, the mode changes to $02. | **When successful, the mode changes to $02. | ||
**When unsuccessful, the mode changes to $00. | **When unsuccessful, the mode changes to $00. | ||
*This response can only happen in mode 1 via NMI. | *This response can only happen in mode 1 via NMI. | ||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
Line 1,975: | Line 2,275: | ||
|- | |- | ||
| | | | ||
*Writes #$06 to $4100 | *Starts NMI timer 1 with period $0006 (5 msec), one-shot: | ||
*Writes #$00 to $4101 | **Writes #$06 to $4100 | ||
*Writes #$02 to $4102 | **Writes #$00 to $4101 | ||
**Writes #$02 to $4102 | |||
*Observed Messages (unused bytes in parentheses): | *Observed Messages (unused bytes in parentheses): | ||
**Super Mario Club rev 09: | **Super Mario Club rev 09: | ||
Line 2,031: | Line 2,332: | ||
***01 01 (00) 01 (02 31) | ***01 01 (00) 01 (02 31) | ||
*Checks if the byte received is 00 and if so, acts differently. | *Checks if the byte received is 00 and if so, acts differently. | ||
*Writes #$06 to $4100 | *Starts NMI timer 1 with period $0006 (5 msec), one-shot: | ||
*Writes #$00 to $4101 | **Writes #$06 to $4100 | ||
*Writes #$02 to $4102 | **Writes #$00 to $4101 | ||
**Writes #$02 to $4102 | |||
*Changes to Command Mode 3 when complete. | *Changes to Command Mode 3 when complete. | ||
*Theory: This command generates response command $81 (see previous section). | |||
|- | |- | ||
|$02 | |$02 | ||
Line 2,047: | Line 2,350: | ||
*[parameter 1] gets written to $002B and $002C. | *[parameter 1] gets written to $002B and $002C. | ||
*9 zero-page addresses get zeroed out; seems to be initializing something. | *9 zero-page addresses get zeroed out; seems to be initializing something. | ||
*Writes #$06 to $4100 | *Starts NMI timer 1 with period $0006 (5 msec), one-shot: | ||
*Writes #$00 to $4101 | **Writes #$06 to $4100 | ||
*Writes #$02 to $4102 | **Writes #$00 to $4101 | ||
**Writes #$02 to $4102 | |||
*Changes to Command Mode 4 when complete. | *Changes to Command Mode 4 when complete. | ||
*Theory: This command generates response command $82 (see previous section). | |||
|- | |- | ||
|$03 | |$03 | ||
Line 2,056: | Line 2,361: | ||
|0 | |0 | ||
|0,1,2,3,<br/>4,5,6,7 | |0,1,2,3,<br/>4,5,6,7 | ||
| | |System Revision and Status Information | ||
<pre>Message Bytes: | <pre>Message Bytes: | ||
[$03] [count=$00] | [$03] [count=$00] | ||
Line 2,086: | Line 2,391: | ||
|40 | |40 | ||
|0,2,5 | |0,2,5 | ||
|Unknown Function. | |Unknown $413x Function. | ||
<pre>Message Bytes: | <pre>Message Bytes: | ||
[$10] [count=$28] [parameter] [...40 bytes...]</pre> | [$10] [count=$28] [parameter] [...40 bytes...] | ||
Response: | |||
[$90] [count=$28] [response parameter] [...40 bytes...]</pre> | |||
*This command is similar to command $11, except using pre-defined data from ROM instead of the additional chunks in command $11. | *This command is similar to command $11, except using pre-defined data from ROM instead of the additional chunks in command $11. | ||
*[parameter] is used but does not count towards the byte count. | *[parameter] is used but does not count towards the byte count. | ||
Line 2,095: | Line 2,403: | ||
**40 bytes from ROM are copied starting at RAM address $0360. ROM table index using parameter bits 2,1,0. | **40 bytes from ROM are copied starting at RAM address $0360. ROM table index using parameter bits 2,1,0. | ||
***$0388 (i.e. 41st byte) set to #$00. | ***$0388 (i.e. 41st byte) set to #$00. | ||
***See Register $4131. | |||
**40 bytes from ROM are copied starting at RAM address $0390. ROM table index using parameter bits 1,0. | **40 bytes from ROM are copied starting at RAM address $0390. ROM table index using parameter bits 1,0. | ||
***$03B8 (i.e. 41st byte) set to #$00. | ***$03B8 (i.e. 41st byte) set to #$00. | ||
***See Register $4132. | |||
**40 bytes from the command are copied starting at RAM address $0330. | **40 bytes from the command are copied starting at RAM address $0330. | ||
***$0358 (i.e. 41st byte) set to #$00. | ***$0358 (i.e. 41st byte) set to #$00. | ||
***$0330 (i.e. 1st byte) set to #$00. | ***$0330 (i.e. 1st byte) set to #$00. | ||
***See Register $4130. | |||
**5 static bytes from ROM are copied starting at RAM address $0320: 01 40 50 00 60 | **5 static bytes from ROM are copied starting at RAM address $0320: 01 40 50 00 60 | ||
***See Register $4133. | |||
*[parameter] value #$10: | *[parameter] value #$10: | ||
**Skips the $0360 and $0390 ROM copy routines if RAM $0055 == #$00. | **Skips the $0360 and $0390 ROM copy routines if RAM $0055 == #$00. | ||
**If $0055 is not #$00, it aborts the command. | **If $0055 is not #$00, it aborts the command. | ||
*Writes #$00 to $4137 | *Writes #$00 to $4137 | ||
*Writes shifting | *Writes the 4 data chunks shifting 1 bit at a time to $4130, $4131, $4132, $4133 | ||
*Writes #$00 to $4136 | *Writes #$00 to $4136 | ||
*For the response, the count has not been confirmed to include [response parameter] or not. | |||
*The response comes from RAM starting at $03C0. (See register $4134.) | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|ROM Data | |||
|- | |||
| | |||
Data Loaded to $0330 (which later gets written to register $4130): | |||
(These are the 40 bytes supplied by the Famicom to this command, with 1st byte and 41st byte set to $00.) | |||
|- | |||
| | |||
Data Loaded to $0360 (which later gets written to register $4131): | |||
{|class="wikitable" | |||
!|Parameter Bits | |||
!|Data | |||
|- | |||
|xxxxx000 | |||
|00000c6bbc41351b1e0fa372963f7af704415090ee9a139ff87c60ca610dec66f74bd5b992c8868300 | |||
|- | |||
|xxxxx001 | |||
|0000027473468ebd1f161331ad0e5512ba56487f7b30037dac78ed9c51b308b6d8c597ca8b59cc1300 | |||
|- | |||
|xxxxx010 | |||
|000001c89b4630b518cbc342a45282fa0908773df56830150ec1955c9ec1abbd1100d4d878604afd00 | |||
|- | |||
|xxxxx011 | |||
|00000939c25f1859304000e9fdab927959a49d1acdd136da4ddb2b551b2bc942a36077d1d09dbc3500 | |||
|- | |||
|xxxxx100 | |||
|3cfed7ad4cd7435c3544144572d1d0e83d1859864bf8c7412cac015ced49a1cabce13fbd6262af0b00 | |||
|- | |||
|xxxxx101 | |||
|8aac02df739c8c0a2572493bd95755450b06ea0d77f1f08bc665636ed3cf317cb89f6f301ef03a2f00 | |||
|- | |||
|xxxxx110 | |||
|39b07c4f12614dadb4eb214af3a6a0dc046b47d10c184b04d16c91d9eeb5e0c21a052529738c6f0100 | |||
|- | |||
|xxxxx111 | |||
|36a6a31fa79ba49a9f1d1985c640ad9a6c79a4195d06ece8726fc006e1d347efa5d129cdb79017b900 | |||
|- | |||
|} | |||
|- | |||
| | |||
Data Loaded to $0390 (which later gets written to register $4132): | |||
{|class="wikitable" | |||
!|Parameter Bits | |||
!|Data | |||
|- | |||
|xxxxxx00 | |||
|882a14099f3f32b2419d0b09237a252ece6534274700628043a6df86657a84c0c4463fa72b49ad4900 | |||
|- | |||
|xxxxxx01 | |||
|bbb57552f19d8a71d6ed68fd037188b700eab270071acedc624ff4c64b53ed1c4e1046ed89e775fd00 | |||
|- | |||
|xxxxxx10 | |||
|cfb8e78ec54b81a1100f02f524acf0e05a45cc36a98f161c115a41082abb587ecabad5453511877100 | |||
|- | |||
|xxxxxx11 | |||
|aa189432166db82500fffbb1107ced2469b12f0959b263c63a0332bb4a8e6ea378a0a47150cb296100 | |||
|- | |||
|} | |||
|- | |||
| | |||
Data Loaded to $0320 (which later gets written to register $4133): | |||
{|class="wikitable" | |||
!|Parameter Bits | |||
!|Data | |||
|- | |||
|xxxxxxxx | |||
|0140500060 | |||
|- | |||
|} | |||
|} | |||
|- | |- | ||
|$11 | |$11 | ||
Line 2,115: | Line 2,497: | ||
|127 | |127 | ||
|0,2,5 | |0,2,5 | ||
|Unknown Function. | |Unknown $413x Function. | ||
<pre>Message Bytes: | <pre>Message Bytes: | ||
[$11] [count=$7F] [...5 byte chunk...] [...41 byte chunk 0...] | [$11] [count=$7F] [...5 byte chunk...] [...41 byte chunk 0...] | ||
[...41 byte chunk 1...] [...41 byte chunk 2...]</pre> | [...41 byte chunk 1...] [...41 byte chunk 2...] | ||
Response: | |||
[$91] [count=$29] [response parameter] [...41 bytes...]</pre> | |||
*Note that the first byte of the 5 byte chunk is not ignored in this command like it is in most others, though it still does not count towards the byte count. | *Note that the first byte of the 5 byte chunk is not ignored in this command like it is in most others, though it still does not count towards the byte count. | ||
*The 5 byte chunk gets written to RAM starting at $0320 with lots of bit shifting and byte swapping. | *The 5 byte chunk gets written to RAM starting at $0320 with lots of bit shifting and byte swapping. (See Register $4133.) | ||
*The 41 byte chunk 0 gets copied to RAM starting at $0330. | *The 41 byte chunk 0 gets copied to RAM starting at $0330. (See Register $4130.) | ||
*The 41 byte chunk 1 gets copied to RAM starting at $0360. | *The 41 byte chunk 1 gets copied to RAM starting at $0360. (See Register $4131.) | ||
*The 41 byte chunk 2 gets copied to RAM starting at $0390. | *The 41 byte chunk 2 gets copied to RAM starting at $0390. (See Register $4132.) | ||
*Shares the remaining code in common with command $10. | *Shares the remaining code in common with command $10. | ||
*For the response, the count has not been confirmed to include [response parameter] or not. | |||
*The response comes from RAM starting at $03C0. (See register $4134.) | |||
|- | |- | ||
|$12 | |$12 | ||
Line 2,153: | Line 2,540: | ||
**Not known what sets up that pointer. | **Not known what sets up that pointer. | ||
*This command is tricky to disassemble because it actually does copy the [xx] byte, then writes over it with the byte count, ultimately not using it. | *This command is tricky to disassemble because it actually does copy the [xx] byte, then writes over it with the byte count, ultimately not using it. | ||
*Theory: This command sends a UART Tx Packet to the Oki MSM6827L, and connected with response command $C0. | |||
|- | |- | ||
|$41 | |$41 | ||
Line 2,171: | Line 2,559: | ||
*Writes value $FF directly to the location pointed to by $0000:0001. | *Writes value $FF directly to the location pointed to by $0000:0001. | ||
**Not known what sets up that pointer. | **Not known what sets up that pointer. | ||
*Theory: This command is something to do with the Tone Rx chip, and connected with response command $C1. | |||
|- | |- | ||
|$60 | |$60 | ||
Line 2,194: | Line 2,583: | ||
[$61] [count=$00]</pre> | [$61] [count=$00]</pre> | ||
*This command abruptly disconnects the modem. | *This command abruptly disconnects the modem. | ||
*Writes #$00 to register $4102. | *Writes #$00 to register $4102. (Stops NMI timer 1.) | ||
*Changes mode to 0 when complete. | *Changes mode to 0 when complete. | ||
|- | |- | ||
Line 2,223: | Line 2,612: | ||
|1 | |1 | ||
|0,2,5 | |0,2,5 | ||
|Modem | |Modem Off Hook Control | ||
<pre>Message Bytes: | <pre>Message Bytes: | ||
[$64] [count=$01] [xx] [ | [$64] [count=$01] [xx] [Modem Off Hook mode]</pre> | ||
*[xx] byte is ignored. | *[xx] byte is ignored. | ||
*[ | *[Modem Off Hook mode] Values: | ||
**$00 = Don't update but save mode as $00. | **$00 = Don't update but save mode as $00. | ||
**$01 = Set $4127.4 (Modem | **$01 = Set $4127.4 (/Modem Off Hook) = 0 (off hook). (Also stores #$00 to $0049) | ||
**$02-FF = Set $4127.4 (Modem | **$02-FF = Set $4127.4 (/Modem Off Hook) = 1 (hang up). (Also stores #$00 to $0049) | ||
**Value gets saved to $004E. | **Value gets saved to $004E. | ||
*PiT Motorboat Race uses this command when closing a connection. | *PiT Motorboat Race uses this command when closing a connection. | ||
Line 2,242: | Line 2,631: | ||
|2 | |2 | ||
|0,2,5 | |0,2,5 | ||
|Modem | |Modem Audio Enable and P4-19 Control | ||
<pre>Message Bytes: | <pre>Message Bytes: | ||
[$65] [count=$02] [xx] [ | [$65] [count=$02] [xx] [Modem Audio Enable mode] [P4-19 mode]</pre> | ||
*[xx] byte is ignored. | *[xx] byte is ignored. | ||
*[ | *[Modem Audio Enable mode] Values: | ||
**$00 = Don't update but save mode as $00. | **$00 = Don't update but save mode as $00. | ||
**$01 = Set $4127.6 (Modem | **$01 = Set $4127.6 (/Modem Audio Enable) = 0 (enabled to TV speakers). | ||
**$02-FF = Set $4127.6 (Modem | **$02-FF = Set $4127.6 (/Modem Audio Enable) = 1 (disabled). | ||
**Value gets saved to $004F. | **Value gets saved to $004F. | ||
*[P4-19 mode] Values: | *[P4-19 mode] Values: | ||
Line 2,304: | Line 2,693: | ||
**Writes [parameter 1] to $75. | **Writes [parameter 1] to $75. | ||
**Refreshes Green LED based on its mode. | **Refreshes Green LED based on its mode. | ||
**Refreshes P4-27 based on its mode. | **Refreshes P4-27 (Phone Off Hook) based on its mode. | ||
**Zeroes out RAM $76,77,37,39,38. | **Zeroes out RAM $76,77,37,39,38. | ||
**Refreshes P4-21 based on its mode. | **Refreshes P4-21 (Phone Audio Enable) based on its mode. | ||
**Zeroes out all queued up outgoing modem Tx messages at RAM $1300-1FFF. | **Zeroes out all queued up outgoing modem Tx messages at RAM $1300-1FFF. | ||
***Each message has space $100 and number of queued messages is at RAM $0100. | ***Each message has space $100 and number of queued messages is at RAM $0100. | ||
Line 2,345: | Line 2,734: | ||
|80 | |80 | ||
|0,2,5 | |0,2,5 | ||
|Unknown Function. | |Unknown $413x Function. | ||
<pre>Message Bytes: | <pre>Message Bytes: | ||
[$6A] [count=$50] [xx] [...40 byte chunk 0...] [...40 byte chunk 1...]</pre> | [$6A] [count=$50] [xx] [...40 byte chunk 0...] [...40 byte chunk 1...]</pre> | ||
*[xx] byte is ignored. | *[xx] byte is ignored. | ||
*Copies the 40 byte chunk 0 to RAM starting at $0360. | *Copies the 40 byte chunk 0 to RAM starting at $0360. (See Register $4131.) | ||
*Copies the negative (2's complement) of each byte in 40 byte chunk 1 to RAM starting at $0390. | *Copies the negative (2's complement) of each byte in 40 byte chunk 1 to RAM starting at $0390. (See Register $4132.) | ||
*Writes #$00 to $0388 and $03B8. (i.e. 41st byte of each.) | *Writes #$00 to $0388 and $03B8. (i.e. 41st byte of each.) | ||
*Writes #$10 to $0055. | *Writes #$10 to $0055. | ||
*Observations: | |||
**No updates were made to buffers at $0320, $0330 from this command. (i.e. register $4133, $4130 data) | |||
**The command does not appear to initiate any operations to the $413x registers. | |||
*Note: This description is fairly complete. | *Note: This description is fairly complete. | ||
|- | |- | ||
Line 2,380: | Line 2,772: | ||
[$F0] [read count N] [$00] ...N bytes from memory...</pre> | [$F0] [read count N] [$00] ...N bytes from memory...</pre> | ||
*[xx] byte does not count towards the byte count. | *[xx] byte does not count towards the byte count. | ||
*See next section for information about CRC | *See next section for information about CRC bytes. | ||
*If [address MSB] >= #$80, exits early with no response. (Prevent ROM dump?? :) ) | *If [address MSB] >= #$80, exits early with no response. (Prevent ROM dump?? :) ) | ||
*If | *If [read count N] >= #$39, exits early with no response. | ||
|- | |- | ||
|$7D | |$7D | ||
Line 2,392: | Line 2,784: | ||
[$7D] [count=N] [xx] [CRC 1] [CRC 2] [address MSB] [address LSB] [...N-4 bytes...]</pre> | [$7D] [count=N] [xx] [CRC 1] [CRC 2] [address MSB] [address LSB] [...N-4 bytes...]</pre> | ||
*[xx] byte does not count towards the byte count. | *[xx] byte does not count towards the byte count. | ||
*See next section for information about CRC | *See next section for information about CRC bytes. | ||
*count - 4 is the number of bytes to write to memory. | *count - 4 is the number of bytes to write to memory. | ||
*Writes $00 to $006E. | *Writes $00 to $006E. | ||
*Super Mario Club rev 09 uses this command at the welcome screen. | *Super Mario Club rev 09 uses this command at the welcome screen. | ||
**7D 1A 00 07 60 01 04 09 01 06 E0 16 A2 90 A5 29 F0 06 C9 FF D0 04 A2 01 86 29 4C 20 F4 (30) | **7D 1A (00) 07 60 01 04 09 01 06 E0 16 A2 90 A5 29 F0 06 C9 FF D0 04 A2 01 86 29 4C 20 F4 (30) | ||
**CRC | **CRC bytes: 07 60 | ||
**Starting address: $0104 (farthest reaches of the stack) | **Starting address: $0104 (farthest reaches of the stack) | ||
{| role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
| | |Disassembly | ||
|- | |- | ||
| <pre> .org $0104 | | <pre> .org $0104 | ||
Line 2,427: | Line 2,819: | ||
|} | |} | ||
*JRA-PAT rev 05 and 06 use this command at power-on. | *JRA-PAT rev 05 and 06 use this command at power-on. | ||
**7D 29 00 EC AD 01 02 1A 01 09 01 06 E0 DB A2 90 A5 29 F0 06 C9 FF D0 04 A2 01 86 29 4C 20 F4 AD 32 00 C9 05 D0 03 EE 32 00 4C 39 E8 (00) | **7D 29 (00) EC AD 01 02 1A 01 09 01 06 E0 DB A2 90 A5 29 F0 06 C9 FF D0 04 A2 01 86 29 4C 20 F4 AD 32 00 C9 05 D0 03 EE 32 00 4C 39 E8 (00) | ||
**CRC | **CRC bytes: EC AD | ||
**Starting address: $0102 (farthest reaches of the stack) | **Starting address: $0102 (farthest reaches of the stack) | ||
{| role="presentation" class="wikitable mw-collapsible mw-collapsed" | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
| | |Disassembly | ||
|- | |- | ||
| <pre> .org $0102 | | <pre> .org $0102 | ||
Line 2,479: | Line 2,871: | ||
[$7E] [count=$05] [xx] [CRC 1] [CRC 2] [parameter 0] [parameter 1] [parameter 2]</pre> | [$7E] [count=$05] [xx] [CRC 1] [CRC 2] [parameter 0] [parameter 1] [parameter 2]</pre> | ||
*[xx] byte does not count towards the byte count. | *[xx] byte does not count towards the byte count. | ||
*See next section for information about CRC | *See next section for information about CRC bytes. | ||
*Writes a lot of stuff to $4120 and $4121 | *Writes a lot of stuff to $4120 and $4121 | ||
*Writes to $4127 bit 5 ( | *Writes to $4127 bit 5 (/DTMF Output Enable) | ||
|- | |- | ||
|$7F | |$7F | ||
Line 2,491: | Line 2,883: | ||
[$7F] [count=$05] [parameter 0] [CRC 1] [CRC 2] [parameter 1] [parameter 2] [parameter 3]</pre> | [$7F] [count=$05] [parameter 0] [CRC 1] [CRC 2] [parameter 1] [parameter 2] [parameter 3]</pre> | ||
*[parameter 0] byte does not count towards the byte count. | *[parameter 0] byte does not count towards the byte count. | ||
*See next section for information about CRC | *See next section for information about CRC bytes. | ||
*If [parameter 0] is $00-7F, write value $0C out the P5 Expansion Port. | *If [parameter 0] is $00-7F, write value $0C out the P5 Expansion Port. | ||
*If [parameter 0] is $80-FF, dump RAM $0240-$0280 out the P5 Expansion Port. | *If [parameter 0] is $80-FF, dump RAM $0240-$0280 out the P5 Expansion Port. | ||
Line 2,522: | Line 2,914: | ||
|4001 | |4001 | ||
|No dial tone was detected. | |No dial tone was detected. | ||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |||
| | |||
Super Mario Club Manual: | |||
{| class="wikitable" | |||
|- | |||
! おもな原因 (Main Cause) !! 対処方法 (Workaround) | |||
|- style="vertical-align: top;" | |||
| | |||
電話線がはずれています。<br/> | |||
The telephone line is off. | |||
| | |||
*通信アダプタの電話回線の差し込みへ電話線を接続してください。 | |||
*Connect the telephone line to the telephone line plug of the communication adapter. | |||
<br/> | |||
*回線テストのテスト1(29ページ) を行ってください。 | |||
*Perform Test 1 (page 29) of the line test. | |||
|- style="vertical-align: top;" | |||
| | |||
既に電話が使われています。<br/> | |||
The phone is already in use. | |||
| | |||
通話が終わるまで待ってください。<br/> | |||
Please wait until the call ends. | |||
|- style="vertical-align: top;" | |||
| | |||
ホー厶テレホン用のモジュラーコンセントなどにテレホンスイッチを取りつけていませんか?<br/> | |||
Is the telephone switch attached to a modular outlet for the Ho 厶 telephone? | |||
| | |||
テレホンスイッチがNTT の局線に直接取りつけられるように工事を行ってください。<br/> | |||
Make sure that the telephone switch can be attached directly to the NTT station line. | |||
|} | |||
Kangyou Sumimaru no Famicom Trade Manual: | |||
{| class="wikitable" | |||
|- | |||
! 原 因•対応方法 (Cause • Countermeasure) | |||
|- style="vertical-align: top;" | |||
| | |||
電話線は正常に接続されていますか?<br/> | |||
Is the telephone line connected normally?<br/><br/> | |||
自宅の電話が使用中ではありませんか?<br/> | |||
Is your home phone in use? | |||
|} | |||
|} | |||
|- | |- | ||
|$02 | |$02 | ||
|4002 | |4002 | ||
|An incoming phone call is being received. | |An incoming phone call is being received. | ||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |- | ||
| | | | ||
Super Mario Club Manual: | |||
| | {| class="wikitable" | ||
|- | |- | ||
| | ! おもな原因 (Main Cause) !! 対処方法 (Workaround) | ||
| | |- style="vertical-align: top;" | ||
|" | | | ||
電話がかかってきました。<br/> | |||
I got a call. | |||
| | |||
受話器をお取りください。<br/> | |||
Please pick up the handset. | |||
|} | |||
Kangyou Sumimaru no Famicom Trade Manual: | |||
{| class="wikitable" | |||
|- | |- | ||
| | ! 原 因•対応方法 (Cause • Countermeasure) | ||
| | |- style="vertical-align: top;" | ||
| | | | ||
もう一度ご利用ください。<br/> | |||
Please use it again. | |||
|} | |||
|} | |||
|- | |- | ||
|$ | |$03 | ||
| | |4003 | ||
| | |Pulse vs. Tone setting is incorrect. | ||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |- | ||
| | | | ||
Super Mario Club Manual: | |||
| | {| class="wikitable" | ||
|- | |- | ||
|$08 | ! おもな原因 (Main Cause) !! 対処方法 (Workaround) | ||
|4008 | |- style="vertical-align: top;" | ||
|Server was busy, disconnected, or rejected the password. | | | ||
|- | プッシュ回線とダイヤル回線の設定を誤っています。<br/> | ||
|$09 | The push line and dial line settings are incorrect. | ||
|4009 | | | ||
|Server was busy | 通信アダプタ裏の切換スイッチを回線に合わせてください。<br/> | ||
|- | Set the changeover switch on the back of the communication adapter to match the line.<br/><br/> | ||
|$0A | |||
|400A | (番号をかけた時にプッシュ回線の場合はピ・ポ・パと鳴りますのでPBにセットしてください。それ以外はダイヤル回線ですので、20にセットしてください。 | ||
|DDX-TP registration incorrect or server disconnected. | *部の地域では 10 にセットしていただく場合があります。)<br/> | ||
|- | (If you use a push line when you dial a number, you will hear a beep, so set it to PB. Other than that, it is a dial line, so set it to 20. | ||
| | *Set it to 10 in some areas. You may be asked to do so.) | ||
| | |||
|DDX-TP registration | |- style="vertical-align: top;" | ||
|- | | | ||
|$0C | テレホンスイッチを新電電アダプタ等の後に取りつけていませんか?<br/> | ||
|400C | Is the telephone switch installed after the new electric adapter, etc.? | ||
| | |||
|- | テレホンスイッチを新電電アダプタより前(NTTの局線側)に取りつけてください。<br/> | ||
|$0D | Install the telephone switch in front of the new electric adapter (NTT station line side). | ||
|400D | |} | ||
|Problem with telephone line connection. | |||
|- | Kangyou Sumimaru no Famicom Trade Manual: | ||
|$0E | {| class="wikitable" | ||
|400E | |- | ||
|Problem with telephone line connection. | ! 原 因•対応方法 (Cause • Countermeasure) | ||
|- | |- style="vertical-align: top;" | ||
|} | | | ||
ご利用電話の種類の設定が誤っています。<br/> | |||
=Pinouts= | The phone type setting is incorrect.<br/><br/> | ||
==RF5C66 Mapper and Disk Drive Controller== | 通信アダプタ裏の電話回線切換スイッチをセットしください。<br/> | ||
Set the telephone line selector switch on the back of the communication adapter.<br/><br/> | |||
任天堂の通信アダプタセット取扱説明書をご覧下さい。<br/> | |||
_____ | Please refer to the Nintendo communication adapter set instruction manual. | ||
/ \ | |} | ||
CPU A0 -> / 1 100 \ -- +5Vcc | |} | ||
CPU A1 -> / 2 99 \ -- n/c | |||
CPU A2 -> / 3 98 \ <> CPU D0 | |- | ||
CPU A3 -> / 4 97 \ <> CPU D1 | |$04 | ||
CPU A4 -> / 5 96 \ <> CPU D2 | |4004 | ||
CPU A5 -> / 6 95 \ <> CPU D3 | |"0" Outgoing call setting is incorrect. | ||
CPU A6 -> / 7 94 \ <> CPU D4 | |||
CPU A7 -> / 8 93 \ <> CPU D5 | {|role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
|Reference Data | |||
|- | |||
| | |||
Super Mario Club Manual: | |||
{| class="wikitable" | |||
|- | |||
! おもな原因 (Main Cause) !! 対処方法 (Workaround) | |||
|- style="vertical-align: top;" | |||
| | |||
0発信の設定が誤っています。<br/> | |||
The 0 outgoing call setting is incorrect.<br/><br/> | |||
(0発信電話なのに0発信の設定がなされていません。 又は直通電話なのに0発信の設定がされています。)<br/> | |||
(0 outgoing call is not set even though it is a 0 outgoing call, or 0 outgoing call is set even though it is a direct call.) | |||
| | |||
登録内容を見直してください。(訂正する場合は、28ページをご参照ください。)<br/> | |||
Please review the registered contents. (Refer to page 28 for corrections.)<br/><br/> | |||
|- style="vertical-align: top;" | |||
| | |||
テレホンスイッチの取りつけが誤っています<br/> | |||
Wrong installation of telephone switch | |||
| | |||
通信機器の接続 (7,8ページ) をご確認ください。<br/> | |||
Check the connection of communication devices (pages 7 and 8). | |||
|} | |||
Kangyou Sumimaru no Famicom Trade Manual: | |||
{| class="wikitable" | |||
|- | |||
! 原 因•対応方法 (Cause • Countermeasure) | |||
|- style="vertical-align: top;" | |||
| | |||
電話回線は利用可能となっていますか?<br/> | |||
Is the telephone line available?<br/><br/> | |||
ご利用の電話は「ゼロ発信」ではありませんか?<br/> | |||
Isn't your phone "zero call"? | |||
|} | |||
|} | |||
|- | |||
|$05 | |||
|4005 | |||
|DDX-TP connection completed earlier than expected. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |||
| | |||
Super Mario Club Manual: | |||
{| class="wikitable" | |||
|- | |||
! おもな原因 (Main Cause) !! 対処方法 (Workaround) | |||
|- style="vertical-align: top;" | |||
| | |||
DDX-TPの開通 (工事) が完了していないと思われます。<br/> | |||
It seems that the opening (construction) of DDX-TP has not been completed.<br/><br/> | |||
| | |||
*回線テストのテスト2 (29ページ) を行ってください。(DDX-TP網IDの場合) | |||
*Perform Test 2 (page 29) of the line test. (For DDX-TP network ID) | |||
<br/> | |||
*NTTの113番に電話して確認してください。 | |||
*Please call NTT 113 to confirm. | |||
|- style="vertical-align: top;" | |||
| | |||
テレホンスイッチの取りつけが誤っています。<br/> | |||
The telephone switch is installed incorrectly. | |||
| | |||
通信機器の接続(7, 8ページ) をご確認ぐださい。<br/> | |||
Check the connection of communication devices (pages 7 and 8). | |||
|} | |||
Kangyou Sumimaru no Famicom Trade Manual: | |||
{| class="wikitable" | |||
|- | |||
! 原 因•対応方法 (Cause • Countermeasure) | |||
|- style="vertical-align: top;" | |||
| | |||
*113に電話して、NTTにDDXの工事完了を確認して下さい。 | |||
*Call 113 to confirm with NTT that the DDX construction has been completed. | |||
|} | |||
|} | |||
|- | |||
|$06 | |||
|4006 | |||
|Unknown. | |||
|- | |||
|$07 | |||
|4007 | |||
|Unknown. | |||
|- | |||
|$08 | |||
|4008 | |||
|Server was busy, disconnected, or rejected the password. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |||
| | |||
Super Mario Club Manual: | |||
{| class="wikitable" | |||
|- | |||
! おもな原因 (Main Cause) !! 対処方法 (Workaround) | |||
|- style="vertical-align: top;" | |||
| | |||
センター側が混雑しています。<br/> | |||
The center side is crowded. | |||
| | |||
しばらく経ってから再度お試しください。<br/> | |||
Please try again after a while. | |||
|- style="vertical-align: top;" | |||
| | |||
センターが停止しています。<br/> | |||
The center is stopped. | |||
| | |||
サービス時間を確認してください。<br/> | |||
Please check the service time. | |||
|- style="vertical-align: top;" | |||
| | |||
DDX-TP の開通 (工事) が完了していないと思われます。<br/> | |||
It seems that the opening (construction) of DDX-TP has not been completed. | |||
| | |||
*回線テストのテスト2(29ページ) を行ってください。(DDX- TP綱IDの場合) | |||
*Perform Test 2 (page 29) of the line test. (For DDX-TP rope ID) | |||
<br/> | |||
*NTTの113番に電話して確認してください。 | |||
*Please call NTT 113 to confirm. | |||
|- style="vertical-align: top;" | |||
| | |||
テレホンスイッチの取りつけが誤っています。<br/> | |||
The telephone switch is installed incorrectly. | |||
| | |||
通信機器の接続(7,8ページ) をご確認ください。<br/> | |||
Check the connection of communication devices (pages 7 and 8). | |||
|- style="vertical-align: top;" | |||
| | |||
DDX-TPパスワードで、登録に誤りがあります。<br/> | |||
There is an error in the registration of the DDX-TP password. | |||
| | |||
パスワード番号とパスワード登録電話番号をご確認ください。<br/> | |||
Please check your password number and password registration phone number. | |||
|} | |||
Kangyou Sumimaru no Famicom Trade Manual:<br/> | |||
Same as 4005. | |||
|} | |||
|- | |||
|$09 | |||
|4009 | |||
|Server was busy. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |||
| | |||
Super Mario Club Manual:<br/> | |||
Same as 4008.<br/><br/> | |||
Kangyou Sumimaru no Famicom Trade Manual: | |||
{| class="wikitable" | |||
|- | |||
! 原 因•対応方法 (Cause • Countermeasure) | |||
|- style="vertical-align: top;" | |||
| | |||
相手方が話中です。しばらくして、再度かけ返して下さい。<br/> | |||
The other party is busy. Please call back again after a while.<br/><br/> | |||
|} | |||
|} | |||
|- | |||
|$0A | |||
|400A | |||
|rowspan="3"|DDX-TP registration incorrect or server disconnected. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |||
| | |||
Super Mario Club Manual: | |||
{| class="wikitable" | |||
|- | |||
! おもな原因 (Main Cause) !! 対処方法 (Workaround) | |||
|- style="vertical-align: top;" | |||
| | |||
DDX-TPの登録内容に誤りがあります。<br/> | |||
There is an error in the registered contents of DDX-TP. | |||
| | |||
NTTの113番に電話して登録内容の確認をしてください。<br/> | |||
Please call NTT 113 to confirm your registration details. | |||
|- style="vertical-align: top;" | |||
| | |||
センターが停止しています。<br/> | |||
The center is stopped. | |||
| | |||
サービス時間を確認してください。(15ページ)<br/> | |||
Please check the service time. (Page 15) | |||
|} | |||
Kangyou Sumimaru no Famicom Trade Manual: | |||
{| class="wikitable" | |||
|- | |||
! 原 因•対応方法 (Cause • Countermeasure) | |||
|- style="vertical-align: top;" | |||
| | |||
再度、お試し下さい。<br/> | |||
Please try again.<br/><br/> | |||
頻繁に発生する場合にはファミコントレード事務局へお電話下さい。<br/> | |||
If it occurs frequently, please call the NES Trade Secretariat. | |||
|} | |||
|} | |||
|- | |||
|$0B | |||
|400B | |||
<!-- This cell rowspanned from 400A. --> | |||
|- | |||
|$0C | |||
|400C | |||
<!-- This cell rowspanned from 400A. --> | |||
|- | |||
|$0D | |||
|400D | |||
|Problem with telephone line connection. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |||
| | |||
Super Mario Club Manual: | |||
{| class="wikitable" | |||
|- | |||
! おもな原因 (Main Cause) !! 対処方法 (Workaround) | |||
|- style="vertical-align: top;" | |||
| | |||
通信アダプタから電話線がはずれました。<br/> | |||
The telephone line has been disconnected from the communication adapter. | |||
| | |||
通信アダプタと電話線の接続を確認してください。<br/> | |||
Check the connection between the communication adapter and the telephone line. | |||
|} | |||
|} | |||
|- | |||
|$0E | |||
|400E | |||
|Problem with telephone line connection or server. | |||
{|role="presentation" class="wikitable mw-collapsible mw-collapsed" | |||
|Reference Data | |||
|- | |||
| | |||
Super Mario Club Manual:<br/> | |||
Same as 400D.<br/><br/> | |||
Kangyou Sumimaru no Famicom Trade Manual:<br/> | |||
Same as 400A. | |||
|} | |||
|- | |||
|} | |||
=Pinouts= | |||
==RF5C66 Mapper and Disk Drive Controller== | |||
_____ | |||
/ \ | |||
CPU A0 -> / 1 100 \ -- +5Vcc | |||
CPU A1 -> / 2 99 \ -- n/c | |||
CPU A2 -> / 3 98 \ <> CPU D0 | |||
CPU A3 -> / 4 97 \ <> CPU D1 | |||
CPU A4 -> / 5 96 \ <> CPU D2 | |||
CPU A5 -> / 6 95 \ <> CPU D3 | |||
CPU A6 -> / 7 94 \ <> CPU D4 | |||
CPU A7 -> / 8 93 \ <> CPU D5 | |||
CPU A12 -> / 9 92 \ <> CPU D6 | CPU A12 -> / 9 92 \ <> CPU D6 | ||
CPU A13 -> / 10 91 \ <> CPU D7 | CPU A13 -> / 10 91 \ <> CPU D7 | ||
Line 2,643: | Line 3,378: | ||
- GND pins 23, 39, 70, 90 are all connected together internally. | - GND pins 23, 39, 70, 90 are all connected together internally. | ||
- 43, 44, 45, 46 are GND on the PCB, but have internal protection diodes from GND, suggesting they are logic pins. | - 43, 44, 45, 46 are GND on the PCB, but have internal protection diodes from GND, suggesting they are logic pins. | ||
- 24, 28, 36, 37, 41, 63 are n/c on the PCB, but | - Pins 45-46, when pulled high, causes oscillation on pin 56. | ||
- Pins 41 | - 24, 28, 36, 37, 41, 63 are n/c on the PCB, but function as noted. | ||
- | - /CE Pins 40, 41, 42 behaviors: | ||
- Pin 40 (Built-in RAM /CE) activates low in range $6000-7FFF, regardless of CPU R/W, but only when M2 is high. | |||
- Pin 29 (CIC-11) observed only high (with or without card inserted). | - Pin 41 (Unknown /CE) always activates low in range $4xE0-4xEF, regardless of CPU R/W and M2. | ||
- Pin 42 (RF5A18 CPU2 /CE) always activates low in range $4xD0-4xDF, regardless of CPU R/W and M2. | |||
- Pin 29 (CIC-11) observed only high (with or without tsuushin card inserted). | |||
- Seems to be a /reset because it sets pins 52-57 low when this pin is low, and possibly lots of other things. | - Seems to be a /reset because it sets pins 52-57 low when this pin is low, and possibly lots of other things. | ||
- Pin 31 (CIC-10) observed only high (with or without card inserted). | - Card R/W is always high when this pin is low. | ||
- Pin 32 (CIC-15) observed high with card inserted and low with no card inserted or when hot-removed. | - Pin 31 (CIC-10) observed only high (with or without tsuushin card inserted). | ||
- Pin 32 (CIC-15) observed high with tsuushin card inserted and low with no card inserted or when hot-removed. | |||
- Does not go high when hot-inserted or Famicom reset in low state, only high when card is present at power-on. | - Does not go high when hot-inserted or Famicom reset in low state, only high when card is present at power-on. | ||
- Pin 16 Pull-up of 20k to 5V is also required in order to avoid triggering reset. | - Pin 16 Pull-up of 20k to 5V is also required in order to avoid triggering reset. | ||
Line 2,684: | Line 3,422: | ||
+5Vcc -- / 9 92 \ <> CPU2 D7 | +5Vcc -- / 9 92 \ <> CPU2 D7 | ||
CPU2 A8 <- / 10 91 \ -- +5Vcc | CPU2 A8 <- / 10 91 \ -- +5Vcc | ||
CPU2 A9 <- / 11 90 \ -> | CPU2 A9 <- / 11 90 \ -> UART Tx (MSM6827L TXD) | ||
CPU2 A10 <- / 12 89 \ <- | CPU2 A10 <- / 12 89 \ <- UART Rx (MSM6827L RXD) | ||
CPU2 A11 <- / 13 88 \ <- CPU A2 | CPU2 A11 <- / 13 88 \ <- CPU A2 | ||
CPU2 A12 <- / 14 87 \ <- CPU A1 | CPU2 A12 <- / 14 87 \ <- CPU A1 | ||
Line 2,695: | Line 3,433: | ||
CPU2 R/W <- / 20 81 \ <> Card D6 | CPU2 R/W <- / 20 81 \ <> Card D6 | ||
RAM /CE ($0000-1FFF) <- / 21 \ | RAM /CE ($0000-1FFF) <- / 21 \ | ||
(n/c) ROM /CE ($C000- | (n/c) ROM /CE ($C000-xFFF) <- / 22 O / | ||
P5 /CE ($4129 Only) <- / 23 80 / <> Card D5 | P5 /CE ($4129 Only) <- / 23 80 / <> Card D5 | ||
(GND) CPU2 +Reset -> / 24 79 / <> Card D4 | |||
(GND) ? -> / 25 78 / -- GND | |||
/Internal ROM Enable -> / 26 Nintendo RF5A18 77 / <> Card D3 | |||
(5C66-68) CPU2 /Reset -> / 27 Package QFP-100, 0.65mm pitch 76 / <> Card D2 | (5C66-68) CPU2 /Reset -> / 27 Package QFP-100, 0.65mm pitch 76 / <> Card D2 | ||
(10k up) CPU2 /IRQ -> / 28 75 / <> Card D1 | |||
(10k up) CPU2 /NMI -> / 29 Modem Controller 74 / <> Card D0 | (10k up) CPU2 /NMI -> / 29 Modem Controller 74 / <> Card D0 | ||
n/c -- / 30 CPU2 73 / <- Tone Rx DV | n/c -- / 30 CPU2 73 / <- Tone Rx DV | ||
Line 2,707: | Line 3,445: | ||
\ 71 / <- Tone Rx D4 | \ 71 / <- Tone Rx D4 | ||
+5Vcc -- \ 31 70 / <- Tone Rx D2 | +5Vcc -- \ 31 70 / <- Tone Rx D2 | ||
MSM6827L DATA <> \ 32 69 / <- Tone Rx D1 | |||
MSM6827L /INT -> \ 33 68 / -> Tone Rx GT | |||
MSM6827L /RD <- \ 34 67 / -> Exp P3-19 | |||
MSM6827L /WR <- \ 35 66 / <> Exp P3-18 | |||
MSM6827L EXCLK <- \ 36 65 / <> Exp P3-17 | |||
(n/c) $4120.2 <- \ 37 64 / -- +5Vcc | (n/c) $4120.2 <- \ 37 64 / -- +5Vcc Orientation: | ||
MSM6827L AD1 <- \ 38 63 / -> Modem P4-19 -------------------- | |||
MSM6827L AD0 <- \ 39 62 / -> /Phone Audio Enable 80 51 | |||
(n/c) CPU2 D0 <- \ 40 61 / -> /DTMF Output Enable | | | |||
(n/c) ? <- \ 41 60 / -> | (n/c) ? <- \ 41 60 / -> /Phone Off Hook .-----------. | ||
(4.9152 MHz) Exp P3-16 <- \ 42 59 / -> $4127.3 (n/c) | (4.9152 MHz) Exp P3-16 <- \ 42 59 / -> $4127.3 (n/c) 81-|O RF5A18 |-50 | ||
GND -- \ 43 58 / -> Green LED | GND -- \ 43 58 / -> /Green LED | Nintendo | | ||
19.6608MHz Xtal -- \ 44 57 / -> Red LED | 19.6608MHz Xtal -- \ 44 57 / -> /Red LED 100-| GCD 8C O|-31 | ||
1k to Xtal -- \ 45 56 / -> | 1k to Xtal -- \ 45 56 / -> MSM6827L +Reset \-----------' | ||
GND -- \ 46 55 / <- Audio from phone line | | | |||
(+5Vcc) $4126.0 -> \ 47 54 / <- Modem P4-28 | (+5Vcc) $4126.0 -> \ 47 54 / <- Modem P4-28 01 30 | ||
(+5Vcc) !($4126.1) -> \ 48 53 / <- Modem P4-25 | (+5Vcc) !($4126.1) -> \ 48 53 / <- Modem P4-25 | ||
5C66-69 -> \ 49 52 / <- Switch SW1-4 | 5C66-69 -> \ 49 52 / <- Switch SW1-4 Legend: | ||
n/c -- \ 50 51 / <- Switch SW1-2 | n/c -- \ 50 51 / <- Switch SW1-2 ------------------------------ | ||
\ / | \ / --[RF5A18]-- Power, n/a | ||
\ / | \ / ->[RF5A18]<- RF5A18 input | ||
\ / | \ / <-[RF5A18]-> RF5A18 output | ||
V | V <>[RF5A18]<> Bidirectional | ||
Notes: | Notes: | ||
- This chip contains its very own 65C02 CPU, with built-in ROM. | - This chip contains its very own 65C02 CPU, with built-in ROM. | ||
- +5Vcc pins 9, 31, 64, 91 are all connected together internally. | - +5Vcc pins 9, 31, 64, 91 are all connected together internally. | ||
- GND pins 18, 43, 46, 78, 100 are all connected together internally. | - GND pins 18, 43, 46, 78, 100 are all connected together internally. | ||
- 24 | - 24, 26 are GND on the PCB, but function as noted. | ||
- 47, 48 are +5Vcc on the PCB, but | - 25 is GND on the PCB, but has internal protection diode from GND, suggesting it is a logic pin. | ||
- 15, 16, 17, 19, 22, 37, 40 | - 47, 48 are +5Vcc on the PCB, but function as noted. | ||
- 15, 16, 17, 19, 22, 37, 40, 59 are n/c on the PCB, but function as noted. | |||
- 41 is n/c on the PCB, but has protection diode from GND, suggesting it may have a function. | |||
- Pin 42 (Exp 16) puts out a 4.92 MHz square wave, ~50% duty. This is 19.6608 MHz / 4. | - Pin 42 (Exp 16) puts out a 4.92 MHz square wave, ~50% duty. This is 19.6608 MHz / 4. | ||
- CPU2 /Reset comes from RF5C66 pin 68 on new revisions and selectable with J1, J2 on old revisions: | - CPU2 /Reset comes from RF5C66 pin 68 on new revisions and selectable with J1, J2 on old revisions: | ||
- J2 closed = RF5C66 pin 37 (default) | - J2 closed = RF5C66 pin 37 (default) | ||
- J1 closed = RF5C66 pin 68 | - J1 closed = RF5C66 pin 68 | ||
- Pin 24 prevents CPU2 functioning when held high at power-on. If the pin is then driven low, the reset vector is then fetched after that. | |||
- Pin 24 can be freely used as a +reset at any time this way. | |||
- Pin 25 low at any time causes address bus to go to $FFFF and data bus shows a toggle on bits 2,5,6,7: period 208.7 usec, low for 7.93 usec. | |||
- Other data bits always low. | |||
- Shortly after applying power, the toggle has a lot of variations for a period of about 1.5 seconds, including a 225 msec gap where the bits are low. | |||
- The mentioned data bits all appear to have the same data. | |||
- Held low at power-on will fetch the reset vector later when driven high. | |||
- Held high at power-on, driven low later, enters the data bus toggle mode but: | |||
- Does not appear to fetch the reset vector when driven high after that. | |||
- Does execute code, possibly resuming from where it left off. | |||
- When pin 26 is set low (default case: This pin is tied directly to GND on the PCB): | |||
- Internal ROM is enabled in CPU2 range $E000-FFFF. | |||
- Open Bus in CPU2 range $C000-DFFF. | |||
- Pin 22 (ROM /CE) is enabled low in range $C000-DFFF | |||
- This mode allows ROM expansion at $C000-DFFF, with internal ROM (and its vector table) in place. | |||
- When pin 26 is set high: | |||
- Internal ROM is disabled, leaving open bus in CPU2 range $E000-FFFF. | |||
- Open Bus in CPU2 range $C000-DFFF. | |||
- Pin 22 (ROM /CE) is enabled low in the entire range $C000-FFFF. | |||
- This mode allows a totally custom external CPU2 ROM with its own interrupt vector table. | |||
==LH5323M1 Kanji Graphic ROM== | ==LH5323M1 Kanji Graphic ROM== | ||
Line 2,817: | Line 3,577: | ||
- Note: Some assumptions made on CIC chips based on similarity to F411A from Super NES. | - Note: Some assumptions made on CIC chips based on similarity to F411A from Super NES. | ||
==8kByte CHR | ==8kByte CHR RAM== | ||
_______ _______ | _______ _______ | ||
| \_/ | | | \_/ | | ||
Line 2,876: | Line 3,636: | ||
==P4: Modem Module Edge Connector== | ==P4: Modem Module Edge Connector== | ||
Famicom | Modem | Famicom | |||
Network System | Module | Network System | |||
__________ | |||
| | | |||
+5Vcc -- | 1 19 | <- 5A18-63 | |||
MSM6827L +Reset -> | 2 20 | <- Tone Rx GT | |||
MSM6827L AD0 <> | 3 21 | <- /Phone Audio Enable | |||
GND -- | 4 22 | -> Tone Rx DV | |||
MSM6827L AD1 <> | 5 23 | -> 5A18-55, Audio from phone line | |||
MSM6827L RXD <- | 6 24 | <- Tone Rx Xin, from 5C66-26 | |||
MSM6827L DATA <- | 7 25 | -> 5A18-53 | |||
MSM6827L TXD -> | 8 26 | -- GND | |||
MSM6827L /WR -> | 9 27 | <- /Phone Off Hook | |||
MSM6827L EXCLK -> | 10 28 | -> 5A18-54 | |||
MSM6827L /RD -> | 11 29 | <> 5C66-60 | |||
+5Vcc -- | 12 30 | <- /DTMF Output Enable | |||
Tone Rx D1 <- | 13 31 | <> 5C66-62 __________________________ | |||
MSM6827L /INT <- | 14 32 | <> 5C66-61 | Modem Module | | |||
+5Vcc -- | 15 33 | <- Audio from 2A03 | Orientation | | |||
Tone Rx D2 <- | 16 34 | -> Audio to RF | | | |||
Tone Rx D8 <- | 17 35 | -- GND | 19 _____________ 36 | | |||
Tone Rx D4 <- | 18 36 | -- GND | 1 |___________| 18 | | |||
|________| |________________________| | |||
Note: The modem module uses modem chip Oki MSM6827L and Dual Tone Receiver MC14LC5436P. | Note: The modem module uses modem chip Oki MSM6827L and Dual Tone Receiver MC14LC5436P. | ||
==P2: | ==P2: Tsuushin Card Connector== | ||
Note that the tsuushin card may appear to have a metric 1mm pin pitch, but in fact it has an imperial 0.040" (40 thousandths) pin pitch. | |||
Card | | Famicom Network System | Card | | Famicom Network System | ||
Line 2,908: | Line 3,670: | ||
1 |--| +5Vcc | 1 |--| +5Vcc | ||
2 |--| +5Vcc | 2 |--| +5Vcc | ||
3 |??| n/c in host | 3 |??| n/c in JRA-PAT, n/c in host | ||
4 |??| n/c in JRA-PAT, Host has 10k pull-up only. | 4 |??| n/c in JRA-PAT, Host has 10k pull-up only. | ||
5 |<>| Card D0 | 5 |<>| Card D0 | ||
Line 2,989: | Line 3,751: | ||
=See Also= | =See Also= | ||
*https://forums.nesdev.org/viewtopic.php?f=9&t=18530 | *https://forums.nesdev.org/viewtopic.php?f=9&t=18530 | ||
*https://niwanetwork.org/wiki/Tsuushin_Cartridge | |||
*https://niwanetwork.org/wiki/List_of_Famicom_Network_System_software | |||
[[Category:Mappers using $4020-$5FFF]][[Category:Mappers_with_IRQs]][[Category:ASIC_mappers]][[Category:Pinouts]][[Category:Expansion audio]] | [[Category:Mappers using $4020-$5FFF]][[Category:Mappers_with_IRQs]][[Category:ASIC_mappers]][[Category:Pinouts]][[Category:Expansion audio]] |
Revision as of 00:40, 23 May 2024
System Overview
The Famicom Network System is a complicated device with its own memory mapping system and internal CPU. The RF5C66 chip provides the main mapper functionality, delegating its own registers at $40A0, RF5A18 Famicom registers at $40D0, an internal Kanji ROM at $5000, an internal 8kByte W-RAM at $6000. It also controls the bank of a built-in 16 KiB CHR RAM (using two 8 KiB CHR RAM chips).
The RF5A18 contains CPU2, which is a 65C02 processor with its own independent CPU clock. It has a built-in 4kByte ROM. This chip is responsible for controlling the modem communications. It communicates with the Famicom CPU through four bidirectional registers at $40Dx.
The Famicom Network System plugs into the Famicom through its cartridge connector and provides the user a ZIF style slot to insert a tsuushin card. The card is similar to a normal cartridge but does not have access to any PPU signals. Commercial cards are observed to have their own MMC1 memory mapper, which does not interfere with any of the registers of the Famicom Network System. CPU R/W and the CPU data bus are routed through the RF5C66 chip before making it to the card and other internal hardware. It effectively blocks the Famicom Network System from driving the data bus for certain regions of memory, and possibly also is intended to act as a bidirectional buffer / signal conditioner. It is also used for blocking writes when the lid switch is open or when the CIC fails. Older revisions of Famicom Network System also buffered the Famicom address bus with 74HC541 chips, so it is plausible that signal conditioning was a concern.
LH5323M1 Kanji Graphic ROM
The LH5323M1 is a 256kByte graphics ROM containing primarily Kanji data that is mapped at $5000-5FFF. Each index in this range is a 32-byte space containing 16x16 1bpp graphics, usually for a single character, and each read automatically advances to the next byte in the sequence. There are 2 128kByte banks, and the low bank is default at power-on. Writing 1 to $40B0.0 selects the high bank. Reading from $40B0 resets to the beginning of the 32-byte sequence. Writing $40B0 does not reset the sequence however. No values written to $40B0 have been observed to arbitrarily change or reset the position in the sequence.
Expansion Audio
The Famicom Network System does have expansion audio capabilities. The Famicom audio is routed through the modem module, but nowhere directly to either of the large ASICs. Dial tones have been observed through the television speakers. It is unlikely but unknown if there are other possible sources of sound.
Disk Drive Support
According to a block diagram with potentially dubious origins, the RF5C66 chip contains a disk drive controller. Similar design in several ways to the Famicom Disk System, it is suspected that a disk drive can be connected to the expansion port and controlled by the RF5C66. Since this feature was never used, it is unknown how to use or activate it, or even if that feature is fully implemented. The original FDS has a large DRAM that is not present as a discrete chip in the Famicom Network System. It is unknown if such a DRAM could be already integrated into the RF5C66, or could be attached externally and simply not populated, or if a special tsuushin card was to be constructed containing this RAM. All original FDS registers are notably absent and all discovered registers start immediately after where the FDS registers would normally be. There is no obvious path to produce FDS expansion audio. This remains a mystery presently.
One possibility if the RF5C66 follows a similar pinout to the FDS RP2C33:
79 / -> Exp P3-2 (reg unknown) Serial Out (observed 95.95kHz) 78 / <- Exp P3-3 (reg unknown) Serial In 77 / -> Exp P3-4 (!$40A4.2) Read / Write 76 / -> Exp P3-5 (!$40A4.1) Reset Transfer Timing 75 / -> Exp P3-6 ($40A3.0) Turn on Motor 74 / <- Exp P3-7 ($40A5.2) Write Protect 73 / <- Exp P3-8 ($40A5.1) Disk Not Ready 72 / <- Exp P3-9 ($40A5.0) Disk Missing 71 / <- Exp P3-11 ($40A5.7) Battery Health
Memory Map
+================+ $0000 - Famicom Internam RAM | Famicom | | Internal RAM | +----------------+ $0800 | (Mirrors of | | $0000-$07FF) | +================+ $2000 - Famicom PPU Registers | Famicom PPU | | Registers | +----------------+ $2008 | (Mirrors of | | $2000-$2007) | +================+ $4000 - Famicom APU, IO, and Test Registers | FC APU and IO | | Registers | +----------------+ $4018 | FC Test Mode | | Registers | +----------------+ $4020 | (Open Bus) | +================+ $40A0 - Famicom Network System Internal Registers | Famicom Modem | | RF5C66 | | Registers | +----------------+ $40D0 | Famicom Modem | | RF5A18 (CPU2) | | Registers | +----------------+ $40D8 | (Mirror of | | $40D0-$40D7) | +----------------+ $40E0 | Unused Device | | Registers | | (Open Bus) | +----------------+ $40F0 | (Open Bus) | +----------------+ $4100 | (Open Bus) | +----------------+ $41A0 | (Mirror of | | $40A0-$40FF) | +----------------+ $4200 | (Mirrors of | | $4100-$41FF) | +================+ $5000 - Famicom Network System Internal Kanji ROM | FNS | | LH5323M1 | | Kanji ROM | +================+ $6000 - Famicom Network System Internal RAM and Tsuushin Card RAM | FNS | | Internal RAM | +================+ $8000 - Tsuushin Card ROM Space | Tsuushin Card | | Space | | | +================+ $10000
Data Bus Behavior
The CPU data bus is buffered in both directions through the RF5C66 chip before making it to the tsuushin card and other internal hardware, with the exception of the Kanji graphics ROM and the RF5C66's own registers, which sit directly on the CPU data bus. It appears that the buffer goes from CPU Data Bus to Card Data Bus, or Card Data Bus to CPU Data Bus only. There has not been a high-impedance state observed when testing each possible address in read and write directions on a standalone RF5C66 chip. The CPU Data Bus and Card Data Bus were always observed to be equal despite attaching opposite pull-up and pull-down resistors.
When RF5C66 pin 29 is driven low by the master CIC chip's pin 11, it forces Card R/W always high, thereby preventing most RAM and register writes in the Famicom Network System. Potentially, the data bus buffer has an additional behavior in this mode in order to prevent bus conflicts. The lid switch also imposes such a behavior when the lid is open, but it does not appear that the RF5C66 has a way of knowing when the switch is open, so the bus conflicts do not appear to be prevented in that case.
The propagation delay of the CPU data bus buffer and CPU R/W buffer are measured to be about 16 nsec.
Address Range | Buffer Direction When Reading | Buffer Direction When Writing | Notes |
---|---|---|---|
$0x00-$4x1F | CPU -> Card | CPU -> Card | Famicom internal RAM and registers |
$4x20-$4x9F | CPU -> Card | CPU -> Card | (unknown; FDS registers exactly fit here) |
$4xA0-$4xCF | CPU -> Card | CPU -> Card | RF5C66 registers |
$4xD0-$4xDF | CPU <- Card | CPU -> Card | CPU 2 registers, /CE at RF5C66 pin 42 |
$4xE0-$4xEF | CPU <- Card | CPU -> Card | Unused device registers, /CE at RF5C66 pin 41 |
$4xF0-$4xFF | CPU -> Card | CPU -> Card | (unknown) |
$5x00-$5xFF | CPU -> Card | CPU -> Card | Kanji graphic ROM, /CE at RF5C66 pin 50 |
$6x00-$7xFF | CPU <- Card | CPU -> Card | Famicom Network System internal RAM, /CE at RF5C66 pin 40 |
$8x00-$FxFF | CPU <- Card | CPU -> Card | Tsuushin card, /CE is /ROMSEL |
Note that address range $4xE0-$4xEF was meant for a second device similar to CPU 2. Since that device doesn't exist, a tsuushin card could theoretically exploit those 256 addresses for its own purposes; for example, its own read/write registers.
Known Registers
Note: All registers available to the Famicom ignore address bits 8-11 because those bits are not physically connected to the RF5C66. Therefore, register $4xA0 has mirrors that exist at $40A0, $41A0 ... $4FA0. For simplicity, this page shows all registers as the $40xx mirror.
Address | Read Has Effect |
Read Has Data |
Write | Owner | Function | ||
---|---|---|---|---|---|---|---|
$40A0 | Unknown | No | Unknown | RF5C66 | No evidence has been found that this register does or does not exist. It is possible that it is a write-only register that is not used by any known Famicom Network System card. No reads or writes to this register were ever observed to have any effect. However, its apparent absence is suspicious enough to have this placeholder here.
Write 76543210 ++++++++-- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
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$40A1 | Unknown | Yes | Unknown | RF5C66 | Unknown Function.
Write 76543210 ++++++++-- (unknown) Read 76543210 ++++++++-- Bits exist but function is unknown
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$40A2 | Yes | Yes | Unknown | RF5C66 | IRQ Acknowledge, similar to FDS register $4030
Write 76543210 ++++++++-- (unknown) Read 76543210 |||||||+-- Timer Interrupt (1: an IRQ occurred) ||||||+--- Bit exists but function is unknown ||||++---- (unlikely to exist) ++++------ Bits exist but function is unknown
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$40A3 | Unknown | No | Yes | RF5C66 | Unknown Function.
Write 76543210 |||||||+-- EXP 6 = $40A3.0 (POR value = 0) +++++++--- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
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$40A4 | Unknown | No | Yes | RF5C66 | Expansion Port Control
Write 76543210 |||||||+-- (unknown) ||||||+--- EXP 5 = !($40A4.1) (POR value = 0) |||||+---- EXP 4 = !($40A4.2) (POR value = 0) +++++----- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
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$40A5 | Unknown | Yes | Unknown | RF5C66 | Expansion Port Input Data
Write 76543210 ++++++++-- (unknown) Read 76543210 |||||||+-- Input value of EXP 9 ||||||+--- Input value of EXP 8 |||||+---- Input value of EXP 7 |++++----- (unlikely to exist) +--------- Input value of EXP 11
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$40A6 | Unknown | Yes | Yes | RF5C66 | M2 Cycle Counter LSB, similar to FDS register $4020
Write 76543210 ++++++++-- Cycle counter reload value (LSB) Read 76543210 ++++++++-- Cycle counter present value (LSB)
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$40A7 | Unknown | Yes | Yes | RF5C66 | M2 Cycle Counter MSB, similar to FDS register $4021
Write 76543210 ++++++++-- Cycle counter reload value (MSB) Read 76543210 ++++++++-- Cycle counter present value (MSB)
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$40A8 | Unknown | No | Yes | RF5C66 | IRQ Control, similar to FDS register $4022
Write 76543210 |||||||+-- IRQ Repeat Flag ||||||+--- IRQ Enable ++++++---- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
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$40A9 | Yes | Yes | Unknown | RF5C66 | Unknown Function.
Write 76543210 ++++++++-- (unknown) Read 76543210 ++++++++-- Bits exist but function is unknown
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$40AA | No | Yes | Unknown | RF5C66 | Unknown Function.
Write 76543210 ++++++++-- (unknown) Read 76543210 ++++++++-- Bits exist but function is unknown
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$40AB | Yes | No | Yes | RF5C66 | Unknown Function.
Write 76543210 ++++++++-- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
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$40AC | Yes | No | Unknown | RF5C66 | Unknown Function.
Write 76543210 ++++++++-- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
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$40AD | Unknown | Yes | Yes | RF5C66 | Mirroring Control
Write 76543210 |+++++++-- (unknown) +--------- Mirroring (POR value = 0) 0 = Vertical Mirroring (CIRAM A10 = PPU A10) 1 = Horizontal Mirroring (CIRAM A10 = PPU A11) Read 76543210 |+++++++-- (unlikely to exist) +--------- Present value of CIRAM A10
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$40AE | Unknown | No | Yes | RF5C66 | Unknown Function.
Write 76543210 |||||||+-- Built-in RAM /CE control (POR value = 1) ||||||| 1 = Built-in RAM /CE enabled to go low for reads and writes in the range $6000-7FFF. ||||||| Pin 5C66.28 = 1 at all address ranges. (This pin normally n/c.) ||||||| 0 = Built-in RAM /CE is always high, preventing all reads and writes of the built-in RAM. ||||||| Pin 5C66.28 = 0 at all address ranges. (This pin normally n/c.) +++++++--- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
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$40B0 | Yes | No | Yes | RF5C66 | Kanji Graphic ROM Control
Write 76543210 |||||||+-- Kanji ROM Bank Select (POR value = 0) +++++++--- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
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$40B1 | Unknown | Yes | Yes | RF5C66 | Modem Control
Write 76543210 |||||||+-- Modem Module pin 29 = $40B1.0, rises slowly, goes low fast (POR value = 1) ||||||+--- Modem Module pin 32 = $40B1.1, rises slowly, goes low fast (POR value = 1) |||||+---- Modem Module pin 31 = $40B1.2, rises slowly, goes low fast (POR value = 1) ||||+----- Pin 5C66.68: CPU2 Reset on new revision Famicom Network Systems (POR value = 1) |||| CPU2 /Reset = !($40B1.3) |||| CPU2 runs when $40B1.3 = 0. |||| See also $40C0.2. |||+------ Exp 15 = $40B1.4, rises slowly, goes low fast (POR value = 1) ||+------- Exp 14 = $40B1.5, rises slowly, goes low fast (POR value = 1) |+-------- Exp 13 = $40B1.6, rises slowly, goes low fast (POR value = 1) +--------- Exp 12 = $40B1.7, rises slowly, goes low fast (POR value = 1) Read 76543210 |||||||+-- Input value of Modem Module pin 29 ||||||+--- Input value of Modem Module pin 32 |||||+---- Input value of Modem Module pin 31 ||||+----- Input value of 5C66 pin 63 (normally n/c) |||+------ Input value of EXP 15 ||+------- Input value of EXP 14 |+-------- Input value of EXP 13 +--------- Input value of EXP 12
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$40C0 | Unknown | Yes | Yes | RF5C66 | CIC Status, CHR Bank, and RAM Control
Write 76543210 |||||||+-- Pin 5C66.35 = $40C0.0 (POR value = 0) ||||||| RAM +CE Enable (1 = enabled, 0 = disabled) ||||||+--- Pin 5C66.36 = $40C0.1 (POR value = 0) |||||| (This pin normally n/c) |||||+---- Pin 5C66.37 = $40C0.2 (POR value = 0) ||||| Old Revision Famicom Network System: CPU2 /Reset (This pin n/c on newer revisions) ||||| CPU2 runs on old revisions when $40C0.2 = 1. ||||| See also $40B1.3. ||||+----- Pin 5C66.38 = $40C0.3 (POR value = 0) |||| CHR RAM Bank Select (selects between two 8 KiB CHR RAM chips) ++++------ (unknown) Read 76543210 |||||||+-- Input value of pin 5C66.31: ||||||| Host CIC /Reset ||||||+--- Input value of pin 5C66.32: |||||| Host CIC /Fail |||||+---- Input value of pin 5C66.33: ||||| CPU2 /Reset ||||+----- Input value of pin 5C66.34: |||| Selected CHR RAM Bank |+++------ (unlikely to exist) +--------- Input value of pin 5C66.29: Filtered Host CIC +Start
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$40D0 | Unknown | Yes | Yes | RF5A18 | Famicom CPU <-> CPU2 Interface, Data Byte 0
Write 76543210 ++++++++-- 8-bit value written here can be read by CPU2 from register $4123. Read 76543210 ++++++++-- 8-bit value read here was written by CPU2 to register $4123.
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$40D1 | Unknown | Yes | Yes | RF5A18 | Famicom CPU <-> CPU2 Interface, Data Byte 1
Write 76543210 ++++++++-- 8-bit value written here can be read by CPU2 from register $4124. Read 76543210 ++++++++-- 8-bit value read here was written by CPU2 to register $4124.
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$40D2 | Unknown | Yes | Yes | RF5A18 | Famicom CPU <-> CPU2 Interface, Data Byte 2
Write 76543210 ++++++++-- 8-bit value written here can be read by CPU2 from register $4125. Read 76543210 ++++++++-- 8-bit value read here was written by CPU2 to register $4125.
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$40D3 | Unknown | Yes | Yes | RF5A18 | Famicom CPU <-> CPU2 Interface, Data Acknowledge
Write 76543210 |||+++++-- (unknown) +++------- 3-bit value written here can be read by CPU2 from register $4122. Read 76543210 |||+++++-- (unlikely to exist) +++------- 3-bit value read here was written by CPU2 to register $4122.
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$40D4 | Unknown | Yes | Yes | RF5A18 | Tone Rx and Expansion I/O Control
Write 76543210 |||||||+-- RF5A18 Pin 65 (Exp 17) = $40D4.0 (open-drain) ||||||+--- RF5A18 Pin 67 (Exp 19) = $40D4.1 (push-pull) |||||+---- RF5A18 Pin 66 (Exp 18) = $40D4.2 (open-drain) +++++----- (unknown) Read 76543210 |||||||+-- $40D4.0 = I/O value of RF5A18 Pin 65 (Exp 17) ||||||+--- $40D4.1 = output value of RF5A18 Pin 67 (Exp 19) |||||+---- $40D4.2 = I/O value of RF5A18 Pin 66 (Exp 18) ||||+----- $40D4.3 = input value of RF5A18 Pin 69 (Tone Rx D1) |||+------ $40D4.4 = input value of RF5A18 Pin 70 (Tone Rx D2) ||+------- $40D4.5 = input value of RF5A18 Pin 71 (Tone Rx D4) |+-------- $40D4.6 = input value of RF5A18 Pin 72 (Tone Rx D8) +--------- $40D4.7 = input value of RF5A18 Pin 73 (Tone Rx DV)
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$40D5 | Unknown | Yes | Unknown | RF5A18 | Clocks
Write 76543210 ++++++++-- (unknown) Read 76543210 ||++++++-- Bits exist but function is unknown ++-------- (unlikely to exist)
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$40D6 | Unknown | Yes | Unknown | RF5A18 | UART Status
Write 76543210 ++++++++-- (unknown) Read 76543210 |||||||+-- Bit exists but function is unknown ||||||+--- $40D6.1 = !($4112.0) read by CPU2. (0 = $4110 UART Rx buffer has a byte ready to be read.) |||||+---- $40D6.2 = !($4112.1) read by CPU2. (0 = $4110 UART Tx buffer can be written.) ||||+----- $40D6.3 = !($4113.1 OR $4113.2) written by CPU2. |||+------ $40D6.4 = !($4113.7) written by CPU2. (1 = Transmit repeat.) ||+------- $40D6.5 = !($4113.6) written by CPU2. ++-------- (unlikely to exist) $40D6.2 previously observed to equal !($4113.7 AND $4112.1) written by CPU2. It was later discovered that this bit also follows the $4112.1 read value (Tx buffer ready), which makes a lot more sense being beside $40D6.1 (Rx buffer ready). The previous observation can be explained because writing to those CPU2 bits both likely changed the availability of the Tx buffer.
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RF5A18 Internal 65C02 CPU
The RF5A18 contains its own CPU, termed "CPU2" on this page. It is a 65C02 supporting bitwise set/clear/branch instructions. Note that CPU2 has its own parallel execution with its own address and data busses that are not available to the Famicom's CPU. CPU2 also has its own clock source, so it does not execute synchronously with the Famicom CPU. CPU2 clock speed is 2.4576 MHz (19.6608 MHz crystal / 8). This section describes CPU2's own memory mapping and its own internal registers.
CPU2 /Reset is controlled 2 different ways depending on the revision of Famicom Network System. To support all revisions when enabling CPU2, both of these bits should be written:
- $40B1.3 = 0 (new revisions Famicom Network System, and old revisions with J1 closed)
- $40C0.2 = 1 (old revisions Famicom Network System with J2 closed)
CPU2 Memory Map
RF5A18 Pin 26 Low (default)
+================+ $0000 | CPU2 RAM | | (U6) | +================+ $2000 | (Returns | | last fetch) | +================+ $4100 | CPU2 Control | | Registers | +================+ $4140 | (Returns | | last fetch) | +================+ $C000 | External ROM | | (not used) | +================+ $E000 | RF5A18 | | Internal ROM | +================+ $10000
RF5A18 Pin 26 High
+================+ $0000 | CPU2 RAM | | (U6) | +================+ $2000 | (Returns | | last fetch) | +================+ $4100 | CPU2 Control | | Registers | +================+ $4140 | (Returns | | last fetch) | +================+ $C000 | | | | | External ROM | | | | | +================+ $10000
CPU2 Known Registers
Address | Read Has Effect |
Read Has Data |
Write | Function | ||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
$4100 | No | No | Yes | NMI Timer 1 Period, low byte.
Write 76543210 ++++++++-- NMI timer 1 period low byte. Read 76543210 ++++++++-- (does not exist)
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$4101 | No | No | Yes | NMI Timer 1 Period, high byte.
Write 76543210 ++++++++-- NMI timer 1 period high byte. Read 76543210 ++++++++-- (does not exist)
| ||||||||||||||||||||||||||||||||||||||
$4102 | No | No | Yes | NMI Timer 1 Restart.
Write 76543210 |||||||+-- $4102.0 = timer 1 loop. 1 = Loop, 0 = One-Shot ||||||+--- $4102.1 = timer 1 restart. 1 = Restart. ++++++---- (unknown) Read 76543210 ++++++++-- (does not exist)
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$4103 | Yes | Yes | Unknown | NMI Timer 1 Acknowledge.
Write 76543210 ++++++++-- (unknown) Read 76543210 |||||||+-- $4103.0 = Timer 1 NMI flag. 1 = Timer 1 NMI triggered. +++++++--- (does not exist)
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$4104 | No | No | Yes | IRQ Timer 2 Period, low byte.
Write 76543210 ++++++++-- IRQ timer 2 period low byte. Read 76543210 ++++++++-- (does not exist)
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$4105 | No | No | Yes | IRQ Timer 2 Period, high byte.
Write 76543210 ++++++++-- IRQ Timer 2 Period, high byte. Read 76543210 ++++++++-- (does not exist)
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$4106 | No | No | Yes | IRQ Timer 2 Restart.
Write 76543210 |||||||+-- $4106.0 = timer 2 loop. 1 = Loop, 0 = One-Shot ||||||+--- $4106.1 = timer 2 restart. 1 = Restart. ++++++---- (unknown) Read 76543210 ++++++++-- (does not exist)
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$4107 | Yes | Yes | Unknown | IRQ Timer 2 Acknowledge.
Write 76543210 ++++++++-- (unknown) Read 76543210 |||||||+-- (unlikely to exist) ||||||+--- Likely to be the Timer 2 IRQ flag ++++++---- (unlikely to exist)
| ||||||||||||||||||||||||||||||||||||||
$4110 | Yes | Yes | Yes | UART Rx/Tx Data Buffer
Write 76543210 ++++++++-- UART Tx Data Byte Bits 7:0 in 8-bit mode, bits 6:0 in 7-bit mode Read 76543210 ++++++++-- UART Rx Data Byte Bits 7:0 in 8-bit mode, bits 6:0 in 7-bit mode
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$4111 | Unknown | Yes | Yes | UART Configuration
Write 76543210 |||||||+-- $4111.0 = UART Rx Enable (1 = enabled) ||||||+--- $4111.1 = UART Tx Enable (1 = enabled) |||||+---- $4111.2 = Baudrate Scaler (0 = multiply baudrate x4) ||||+----- $4111.3 = Data bits (0 = 7 bits, 1 = 8 bits) |||+------ $4111.4 = Tx Stop bits (0 = 1 stop bit, 1 = 2 stop bits) ||+------- $4111.5 = Parity bit (0 = don't use, 1 = append parity bit) |+-------- $4111.6 = Parity type (0 = odd parity, 1 = even parity) +--------- $4111.7 = Send Tx Break (1 = force UART Tx low (break), 0 = normal) Read 76543210 ++++++++-- Reads back the value written.
| ||||||||||||||||||||||||||||||||||||||
$4112 | Unknown | Yes | Yes | UART Status
Write 76543210 |||||||+-- Bit exists but function is unknown ||||||+--- $4112.1: Tx Silence |||||| 0 = Set UART Tx directly high (idle state), 1 = Allow sending data. |||||| This bit figures into $40D6.2 read by the Famicom. (See register $40D6.) |+++++---- (unknown) +--------- $4112.7 = $4110 UART Rx Data IRQ Acknowledge, 1 = Acknowledge IRQ. Read 76543210 |||||||+-- $4112.0 = $4110 UART Rx Buffer Ready Flag (1 = $4110 buffer has a byte ready to be read.) ||||||+--- $4112.1 = $4110 UART Tx Buffer Ready Flag (1 = $4110 buffer can be written.) |||||+---- $4112.2 = UART Tx Idle, 1 = Idle, 0 = Active. ||||+----- Bit exists but function is unknown |||+------ $4112.4 = Rx Parity Error. (1 = error detected) ||+------- $4112.5 = Rx Framing Error. (1 = error detected) |+-------- $4112.6 = Rx Break Received. (1 = break detected) +--------- Bit exists but function is unknown
| ||||||||||||||||||||||||||||||||||||||
$4113 | Unknown | Yes | Yes | UART Configuration
Write 76543210 |||||||+-- (unknown) ||||||+--- $4113.1 figures into $40D6.3 read by the Famicom. (See register $40D6.) |||||+---- $4113.2 figures into $40D6.3 read by the Famicom. (See register $40D6.) ||+++----- (unknown) |+-------- $4113.6 figures into $40D6.5 read by the Famicom. (See register $40D6.) +--------- $4113.7: Tx Repeat 1 = Send once on pin 90 (UART Tx), 0 = Send repeatedly This figures into $40D6.2 and $40D6.4 read by the Famicom. (See register $40D6.) Read 76543210 ++++++++-- Bits exist but function is unknown
| ||||||||||||||||||||||||||||||||||||||
$4114 | Unknown | No | Yes | UART Baudrate
Write 76543210 ||||||++-- UART Baud Rate (Rx and Tx) |||||| This is a clock divider that also affects frequency seen on $40D5.4. ++++++---- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
| ||||||||||||||||||||||||||||||||||||||
$4120 | Unknown | Yes | Yes | Unknown Function.
Write 76543210 |||||||+-- Pin 39 (MSM6827L AD0) = $4120.0 ||||||+--- Pin 38 (MSM6827L AD1) = $4120.1 |||||+---- Pin 37 (n/c) = $4120.2 ||||+----- Pin 36 (MSM6827L /RD) = $4120.3 |||+------ Pin 35 (MSM6827L /WR) = $4120.4 ||+------- Pin 34 (MSM6827L EXCLK) = $4120.5 |+-------- Pin 32 (MSM6827L Data): Direction = $4120.6: 1 = input, 0 = output (refer to $4121.0) +--------- (unknown) Read 76543210 |+++++++-- Bits exist but function is unknown +--------- $4120.7 = Pin 33 (MSM6827L /INT)
| ||||||||||||||||||||||||||||||||||||||
$4121 | Unknown | Yes | Yes | Unknown Function.
Write 76543210 |||||||+-- Pin 32 (MSM6827L Data) = $4121.0 when set as output (refer to $4120.6) +++++++--- (unknown) Read 76543210 ++++++++-- Bits exist but function is unknown
| ||||||||||||||||||||||||||||||||||||||
$4122 | Unknown | Yes | Yes | Famicom CPU <-> CPU2 Interface, Data Acknowledge
Write 76543210 |||+++++-- (unlikely to exist) +++------- 3-bit value written here can be read by Famicom CPU from register $40D3. Read 76543210 |||+++++-- (unlikely to exist) +++------- 3-bit value read here was written by Famicom CPU to register $40D3.
| ||||||||||||||||||||||||||||||||||||||
$4123 | Unknown | Yes | Yes | Famicom CPU <-> CPU2 Interface, Data Byte 0
Write 76543210 ++++++++-- 8-bit value written here can be read by Famicom CPU from register $40D0. Read 76543210 ++++++++-- 8-bit value read here was written by Famicom CPU to register $40D0.
| ||||||||||||||||||||||||||||||||||||||
$4124 | Unknown | Yes | Yes | Famicom CPU <-> CPU2 Interface, Data Byte 1
Write 76543210 ++++++++-- 8-bit value written here can be read by Famicom CPU from register $40D1. Read 76543210 ++++++++-- 8-bit value read here was written by Famicom CPU to register $40D1.
| ||||||||||||||||||||||||||||||||||||||
$4125 | Unknown | Yes | Yes | Famicom CPU <-> CPU2 Interface, Data Byte 2
Write 76543210 ++++++++-- 8-bit value written here can be read by Famicom CPU from register $40D2. Read 76543210 ++++++++-- 8-bit value read here was written by Famicom CPU to register $40D2.
| ||||||||||||||||||||||||||||||||||||||
$4126 | Unknown | Yes | Unknown | Unknown Function.
Write 76543210 ++++++++-- (unknown) Read 76543210 |||||||+-- $4126.0 = Pin 47 (+5V) ||||||+--- $4126.1 = !(Pin 48) (+5V) |||||+---- $4126.2 = Pin 49 (from 5C66-69) ||||+----- $4126.3 = Pin 51 (Switch SW1-2) |||+------ $4126.4 = Pin 52 (Switch SW1-4) ||+------- $4126.5 = Pin 53 (Modem P4-25) |+-------- $4126.6 = Pin 54 (Modem P4-28) +--------- $4126.7 = Pin 55 (Modem P4-23)
| ||||||||||||||||||||||||||||||||||||||
$4127 | Unknown | No | Yes | Unknown Function.
Write 76543210 |||||||+-- Pin 56 MSM6827L +Reset = $4127.0 ||||||+--- Pin 57 /Red LED = $4127.1 |||||+---- Pin 58 /Green LED = $4127.2 ||||+----- Pin 59 (n/c) = $4127.3 |||+------ Pin 60 /Phone Off Hook = $4127.4 ||+------- Pin 61 /DTMF Output Enable = $4127.5 |+-------- Pin 62 /Phone Audio Enable = $4127.6 +--------- Pin 63 (Modem P4-19) = $4127.7 Read 76543210 ++++++++-- (unlikely to exist)
| ||||||||||||||||||||||||||||||||||||||
$4128 | Unknown | Yes | Yes | Unknown Function.
Write 76543210 |||||||+-- Pin 68 (Tone Rx GT) = $4128.0 +++++++--- (unknown) Read 76543210 |||||+++-- (unlikely to exist) ||||+----- $4128.3 = Pin 69 (Tone Rx D1) |||+------ $4128.4 = Pin 70 (Tone Rx D2) ||+------- $4128.5 = Pin 71 (Tone Rx D4) |+-------- $4128.6 = Pin 72 (Tone Rx D8) +--------- $4128.7 = Pin 73 (Tone Rx DV)
| ||||||||||||||||||||||||||||||||||||||
$4129 | Unknown | Unknown | Yes | P5 Expansion Port
Write 76543210 ||||++++-- Data nybble written to device attached to P5 connector. ||++------ Used for sequencing writes to the device. ++-------- (unknown) Read 76543210 ||++++++-- Controlled by device attached to P5 connector, though the ROM code never reads it. ++-------- Not used
| ||||||||||||||||||||||||||||||||||||||
$412F | Unknown | Yes | Yes | Unknown Function.
Write 76543210 |||||||+-- $412F.0 = Timer 1 NMI enable. 1 = Enabled. ||||+++--- (unknown) |||+------ $412F.4 = Pin 33 (MSM6827L /INT) IRQ enable. 1 = Enabled. ||+------- $412F.5 = Pin 73 (Tone Rx DV) IRQ enable. 1 = Enabled. |+-------- $412F.6 = Timer 2 IRQ enable. 1 = Enabled. +--------- $412F.7 = UART Rx IRQ enable. 1 = Enabled. Read 76543210 |||||||+-- Bit exists but function is unknown |||||++--- (unlikely to exist) ||||+----- Bit exists but function is unknown |||+------ $412F.4 = !(Pin 33) (MSM6827L /INT) ||+------- $412F.5 is set when IRQ is triggered by writing 1 to $412F.5. || This is probably the Tone Rx DV interrupt flag. |+-------- $412F.6 is an IRQ flag. 1 = IRQ pending. +--------- Bit exists but function is unknown
| ||||||||||||||||||||||||||||||||||||||
$4130 | Unknown | No | Yes | Unknown Function.
Write 76543210 |||||||+-- Serial bit to be written +++++++--- (unknown, unlikely to exist) Read 76543210 ++++++++-- (unlikely to exist)
| ||||||||||||||||||||||||||||||||||||||
$4131 | Unknown | No | Yes | Unknown Function.
Write 76543210 |||||||+-- Serial bit to be written +++++++--- (unknown, unlikely to exist) Read 76543210 ++++++++-- (unlikely to exist)
| ||||||||||||||||||||||||||||||||||||||
$4132 | Unknown | No | Yes | Unknown Function.
Write 76543210 |||||||+-- Serial bit to be written +++++++--- (unknown, unlikely to exist) Read 76543210 ++++++++-- (unlikely to exist)
| ||||||||||||||||||||||||||||||||||||||
$4133 | Unknown | No | Yes | Unknown Function.
Write 76543210 |||||||+-- Serial bit to be written +++++++--- (unknown, unlikely to exist) Read 76543210 ++++++++-- (unlikely to exist)
| ||||||||||||||||||||||||||||||||||||||
$4134 | Yes | Yes | Unknown | Unknown Function.
Write 76543210 ++++++++-- (unknown) Read 76543210 |||||||+-- Bit exists but function is unknown +++++++--- (unlikely to exist)
| ||||||||||||||||||||||||||||||||||||||
$4135 | Unknown | Yes | Unknown | Unknown Function.
Write 76543210 ++++++++-- (unknown) Read 76543210 |||||||+-- $4135.0 = $4134 Serial Data Ready (1 = ready) +++++++--- (unlikely to exist)
| ||||||||||||||||||||||||||||||||||||||
$4136 | Unknown | No | Yes | Unknown Function.
Write 76543210 ++++++++-- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
| ||||||||||||||||||||||||||||||||||||||
$4137 | Unknown | No | Yes | Unknown Function.
Write 76543210 ++++++++-- (unknown) Read 76543210 ++++++++-- (unlikely to exist)
|
Communication Between Famicom and CPU2
Registers $40D0, $40D1, $40D2, and $40D3 are used for communication between Famicom and CPU2. One would tend to expect the Famicom to receive the same value from any of these four registers if read back right after writing. However, each register is actually a separate register in each direction. The Famicom only controls the value read by CPU2, and CPU2 only controls the value read by the Famicom. It may be that CPU2 echoes the value back in some cases, but don't be fooled.
Data packets are sent in both directions between the Famicom and CPU2 using these registers. The data flow is controlled by status and acknowledge flags in $40D3, and data is sent 3 bytes at a time using registers $40D0, $40D1, and $40D2. When CPU2 receives each 3-byte chunk, it buffers it in its RAM starting at address $0401 until the full message has been received. The maximum message length is at most 255 bytes, possibly less.
Each message starts with a command byte, followed by a byte count. The byte after the byte count is not used and not counted towards the byte count in most commands. There are a total of 25 command bytes, which are stored in a lookup table at CPU2 ROM address $FB52. The index of this lookup table corresponds to the index of a function pointer table at address $FBB2, and a command mode support bitfield table at address $FB6B. This is how CPU2 efficiently directs to a unique message handler function for each command byte. The mode bitfield checks against the mode byte at $0051. It is probably used for enforcing the correct sequence of commands, as the command handlers themselves seem to be a major contributor changing the mode. It seems there are 6 possible modes: 0, 1, 2, 3, 4, and 5, though command $03 is set to support modes 6 and 7 as well. The mode may actually represent a global state machine, such as 0 = disconnected, 1 = dialing, etc.
CPU2 Commands
Commands Read by the Famicom from CPU2
Command Byte |
Description |
---|---|
$80 | This command is received by the Famicom in response to writing to command $00. (See next section for details.) |
$81 | Unknown function.
[$81] [count=$01] [$00] [connection status]
|
$82 | Unknown function.
[$82] [count=$01] [$00] [connection status]
Response:
|
$83 | This command is received by the Famicom in response to writing to command $03. (See next section for details.) |
$90 | This command is received by the Famicom in response to writing to command $10. (See next section for details.) |
$91 | This command is received by the Famicom in response to writing to command $11. (See next section for details.) |
$92 | This command is received by the Famicom in response to writing to command $12. (See next section for details.) |
$C0 | UART Rx Packet
There are 2 different parts of the CPU2 code that can send this message: [$C0] [count=N] [parameter] [...N bytes...]
[$C0] [count=$01] [$00] [parameter]
|
$C1 | Tone Rx Data Packet.
When the packet only contains 1 nybble: [$C1] [count=$01] [$80] [tone Rx nybble]
[$C1] [count=N] [parameter] [tone Rx bytes]
|
$E1 | This command indicates that CPU2 had a failure receiving a command from the Famicom.
Command from Famicom that failed due to invalid command byte, or a command not supported in the present mode: Message from Famicom: [invalid command] [count] [byte 0] [byte 1] ... Response back to Famicom: [$E1] [count=$03] [?] [$00] [invalid command] [byte 1]
Message from Famicom: [command] [invalid count] [byte 0] [byte 1] ... Response back to Famicom: [$E1] [count=$03] [$00] [$01] [command] [byte 1] |
$F0 | This command is received by the Famicom in response to writing to command $7C. (See next section for details.) |
Commands Written by the Famicom to CPU2
Note that most descriptions are incomplete.
Command Byte |
CPU2 Handler Address |
Byte Count Expected |
Modes Supported |
Description | |||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
$00 | $F43A | >= 0 <= 60 |
0 | Hook And Dialing Sequence Configuration
Message Bytes: [$00] [count=N] [xx] [...N bytes command string...] Response: [$80] [count=$01] [$00] [status byte]
Response:
| |||||||||||||||||||||||||||||||||||||
$01 | $F46C | 1 | 2 | Unknown Function.
Message Bytes: [$01] [count=$01] [xx] [parameter]
| |||||||||||||||||||||||||||||||||||||
$02 | $F48A | 2 | 0 | Unknown Function.
Message Bytes: [$02] [count=$02] [xx] [parameter 0] [parameter 1]
| |||||||||||||||||||||||||||||||||||||
$03 | $F4BB | 0 | 0,1,2,3, 4,5,6,7 |
System Revision and Status Information
Message Bytes: [$03] [count=$00] Response: [$83] [count=$0A] [$00] [ROM revision] [ROM checksum MSB] [ROM checksum LSB] [byte 4] ... [byte 10]
| |||||||||||||||||||||||||||||||||||||
$10 | $F71A | 40 | 0,2,5 | Unknown $413x Function.
Message Bytes: [$10] [count=$28] [parameter] [...40 bytes...] Response: [$90] [count=$28] [response parameter] [...40 bytes...]
| |||||||||||||||||||||||||||||||||||||
$11 | $F75C | 127 | 0,2,5 | Unknown $413x Function.
Message Bytes: [$11] [count=$7F] [...5 byte chunk...] [...41 byte chunk 0...] [...41 byte chunk 1...] [...41 byte chunk 2...] Response: [$91] [count=$29] [response parameter] [...41 bytes...]
| |||||||||||||||||||||||||||||||||||||
$12 | $F773 | >= 3 <= 252 |
0,2,5 | CRC Calculator
Message Bytes: [$12] [count=N] [initial] [polynomial 1] [polynomial 2] [...N-2 bytes...] Response: [$92] [count=$02] [$00] [CRC 2] [CRC 1]
| |||||||||||||||||||||||||||||||||||||
$40 | $F7AF | >= 1 <= 252 |
2 | Unknown Function.
Message Bytes: [$40] [count=N] [xx] [...N-1 bytes...]
| |||||||||||||||||||||||||||||||||||||
$41 | $F7D0 | >= 1 <= 100 |
5 | Unknown Function.
Message Bytes: [$41] [count=N] [xx] [...N bytes...]
| |||||||||||||||||||||||||||||||||||||
$60 | $F829 | 6 | 0 | Unknown Function.
Message Bytes: [$60] [count=$06] [...6 data bytes...]
| |||||||||||||||||||||||||||||||||||||
$61 | $F839 | 0 | 1,3,4 | Disconnect
Message Bytes: [$61] [count=$00]
| |||||||||||||||||||||||||||||||||||||
$62 | $F849 | 1 | 0,2,5 | Unknown Function.
Message Bytes: [$62] [count=$01] [xx] [parameter]
| |||||||||||||||||||||||||||||||||||||
$63 | $F887 | 0 | 0,1,2,3, 4,5 |
NOP Command
Message Bytes: [$63] [count=$00]
| |||||||||||||||||||||||||||||||||||||
$64 | $F88D | 1 | 0,2,5 | Modem Off Hook Control
Message Bytes: [$64] [count=$01] [xx] [Modem Off Hook mode]
| |||||||||||||||||||||||||||||||||||||
$65 | $F89D | 2 | 0,2,5 | Modem Audio Enable and P4-19 Control
Message Bytes: [$65] [count=$02] [xx] [Modem Audio Enable mode] [P4-19 mode]
| |||||||||||||||||||||||||||||||||||||
$66 | $F8B7 | 2 | 0,2,5 | LED Control
Message Bytes: [$66] [count=$02] [xx] [red LED mode] [green LED mode]
| |||||||||||||||||||||||||||||||||||||
$67 | $F8D1 | 2 | 0,5 | Unknown Function.
Message Bytes: [$67] [count=$02] [xx] [parameter 0] [parameter 1]
| |||||||||||||||||||||||||||||||||||||
$68 | $F912 | 1 | 0,5 | Unknown Function.
Message Bytes: [$68] [count=$01] [xx] [parameter]
| |||||||||||||||||||||||||||||||||||||
$69 | $F951 | 10 | 0 | Unknown Function.
Message Bytes: [$69] [count=$0A] [xx] [...10 data bytes...]
| |||||||||||||||||||||||||||||||||||||
$6A | $F96F | 80 | 0,2,5 | Unknown $413x Function.
Message Bytes: [$6A] [count=$50] [xx] [...40 byte chunk 0...] [...40 byte chunk 1...]
| |||||||||||||||||||||||||||||||||||||
$7B | $F994 | No Check |
0,1,2,3, 4,5 |
Software Reset
Message Bytes: [$7B] [count=xx] [xx]
| |||||||||||||||||||||||||||||||||||||
$7C | $F9AC | 5 | 0,1,2,3, 4,5 |
Arbitrary Memory Read
Message Bytes: [$7C] [count=$05] [xx] [CRC 1] [CRC 2] [address MSB] [address LSB] [read count N] Response: [$F0] [read count N] [$00] ...N bytes from memory...
| |||||||||||||||||||||||||||||||||||||
$7D | $F9D9 | >= 5 | 0,1,2,3, 4,5 |
Arbitrary Memory Write
Message Bytes: [$7D] [count=N] [xx] [CRC 1] [CRC 2] [address MSB] [address LSB] [...N-4 bytes...]
| |||||||||||||||||||||||||||||||||||||
$7E | $F9FE | 5 | 0,1,2,3, 4,5 |
Unknown Function.
Message Bytes: [$7E] [count=$05] [xx] [CRC 1] [CRC 2] [parameter 0] [parameter 1] [parameter 2]
| |||||||||||||||||||||||||||||||||||||
$7F | $FA16 | 5 | 0,1,2,3, 4,5 |
Unknown Function.
Message Bytes: [$7F] [count=$05] [parameter 0] [CRC 1] [CRC 2] [parameter 1] [parameter 2] [parameter 3]
|
CPU2 Commands with CRC key bytes
CPU2 command $12 calculates the CRC-16 of its message using [polynomial 1] and [polynomial 2] as the CRC polynomial, with [initial] placed in both bytes of the initial value, and performs the calculation LSB-first or "reflected". This command requires the polynomial to be specified in reciprocal form. For example, to calculate the standard CRC-16 with polynomial $8005, [polynomial 1] would be set to $40, [polynomial 2] would be set to $03, and [initial] would be set to $00.
CPU2 Commands $7C, $7D, $7E, and $7F use CRC key bytes [CRC 1] and [CRC 2] to validate the message. These commands calculate a CRC-16 across the message backwards, starting from the last byte and ending at [CRC 1]. The result must be 0 or the command is ignored. The CRC-16 polynomial is $8385 and the initial value is $35AC. The calculation is done LSB-first, or "reflected".
Connection Status Byte
Response commands $80, $81, and $82 send an enumerated value indicating the result when attempting to make a telephone connection. These enumerations are used clearly in the CPU2 ROM: 00, 01, 02, 03, 04, 05, 06, 07, 08, 0B, 0C, 0D, 0E. CPU2 ROM keeps track of this value at RAM location $0052. $00 indicates a successful connection, and all other values indicate a failure. Super Mario Club shows these failures with error code 40xx, xx directly reflecting this byte. Super Mario Club's manual gives troubleshooting information for most of these values. That information was used to create the table below.
Status Byte |
Error Code |
Description | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
$00 | (n/a) | Connection was successful. | ||||||||||||||
$01 | 4001 | No dial tone was detected.
| ||||||||||||||
$02 | 4002 | An incoming phone call is being received.
| ||||||||||||||
$03 | 4003 | Pulse vs. Tone setting is incorrect.
| ||||||||||||||
$04 | 4004 | "0" Outgoing call setting is incorrect.
| ||||||||||||||
$05 | 4005 | DDX-TP connection completed earlier than expected.
| ||||||||||||||
$06 | 4006 | Unknown. | ||||||||||||||
$07 | 4007 | Unknown. | ||||||||||||||
$08 | 4008 | Server was busy, disconnected, or rejected the password.
| ||||||||||||||
$09 | 4009 | Server was busy.
| ||||||||||||||
$0A | 400A | DDX-TP registration incorrect or server disconnected.
| ||||||||||||||
$0B | 400B | |||||||||||||||
$0C | 400C | |||||||||||||||
$0D | 400D | Problem with telephone line connection.
| ||||||||||||||
$0E | 400E | Problem with telephone line connection or server.
|
Pinouts
RF5C66 Mapper and Disk Drive Controller
_____ / \ CPU A0 -> / 1 100 \ -- +5Vcc CPU A1 -> / 2 99 \ -- n/c CPU A2 -> / 3 98 \ <> CPU D0 CPU A3 -> / 4 97 \ <> CPU D1 CPU A4 -> / 5 96 \ <> CPU D2 CPU A5 -> / 6 95 \ <> CPU D3 CPU A6 -> / 7 94 \ <> CPU D4 CPU A7 -> / 8 93 \ <> CPU D5 CPU A12 -> / 9 92 \ <> CPU D6 CPU A13 -> / 10 91 \ <> CPU D7 CPU A14 -> / 11 90 \ -- GND /ROMSEL -> / 12 89 \ <> Card D0 CPU R/W -> / 13 88 \ <> Card D1 M2 -> / 14 87 \ <> Card D2 P6-1 Lid Switch, Card R/W <- / 15 86 \ <> Card D3 (20k resistor to 5Vcc) ? -> / 16 85 \ <> Card D4 /IRQ <- / 17 84 \ <> Card D5 +5Vcc -- / 18 83 \ <> Card D6 n/c -- / 19 82 \ <> Card D7 21.47727MHz Xtal -- / 20 81 \ -- +5Vcc Xtal -- / 21 \ n/c -- / 22 O / GND -- / 23 80 / -- n/c (n/c) Xtal Osc Out <- / 24 79 / -> Exp P3-2 n/c -- / 25 78 / <- Exp P3-3 ToneRx Xin, CIC Clock <- / 26 Nintendo RF5C66 77 / -> Exp P3-4 n/c -- / 27 Package QFP-100, 0.65mm pitch 76 / -> Exp P3-5 (n/c) $40AE.0 <- / 28 75 / -> Exp P3-6 Filt'd HostCIC +Start -> / 29 Mapper and 74 / <- Exp P3-7 Host CIC-12 <- / 30 Disk Drive Controller 73 / <- Exp P3-8 / O 72 / <- Exp P3-9 \ 71 / <- Exp P3-11 Host CIC /Reset -> \ 31 70 / -- GND Host CIC /Fail -> \ 32 69 / -> 5A18-49 CPU2 /Reset -> \ 33 68 / -> CPU2 /Reset (new rev) CHR RAM /CE (input) -> \ 34 67 / <> Exp P3-12 Orientation: RAM +CE <- \ 35 66 / <> Exp P3-13 -------------------- (n/c) $40C0.1 <- \ 36 65 / <> Exp P3-14 80 51 CPU2 /Reset (old rev: J2) <- \ 37 64 / <> Exp P3-15 | | CHR RAM /CE <- \ 38 63 / <- $40B1.3 (n/c) .-----------. GND -- \ 39 62 / <> Modem P4-31 81-|O Nintendo |-50 Built-in RAM /CE ($6000-7FFF) <- \ 40 61 / <> Modem P4-32 | RF5C66 | (n/c) ? /CE ($4xE0-4xEF) <- \ 41 60 / <> Modem P4-29 100-| GCD 4R O|-31 5A18-85 /CE ($4xD0-4xDF) <- \ 42 59 / -- +5Vcc \-----------' (GND) ? -> \ 43 58 / -- n/c | | (GND) ? -> \ 44 57 / -> Kanji ROM A17 01 30 (GND) ? -> \ 45 56 / -> Kanji ROM A4 (GND) ? -> \ 46 55 / -> Kanji ROM A3 Legend: CIRAM A10 <- \ 47 54 / -> Kanji ROM A2 ------------------------------ PPU A11 -> \ 48 53 / -> Kanji ROM A1 --[RF5C66]-- Power PPU A10 -> \ 49 52 / -> Kanji ROM A0 ->[RF5C66]<- RF5C66 input Kanji ROM /CE ($5000-5FFF) <- \ 50 51 / -- n/c <-[RF5C66]-> RF5C66 output \ / <>[RF5C66]<> Bidirectional \ / f Famicom connection \ / r ROM chip connection V R RAM chip connection Notes: - +5Vcc pins 18, 59, 81, 100 are all connected together internally. - GND pins 23, 39, 70, 90 are all connected together internally. - 43, 44, 45, 46 are GND on the PCB, but have internal protection diodes from GND, suggesting they are logic pins. - Pins 45-46, when pulled high, causes oscillation on pin 56. - 24, 28, 36, 37, 41, 63 are n/c on the PCB, but function as noted. - /CE Pins 40, 41, 42 behaviors: - Pin 40 (Built-in RAM /CE) activates low in range $6000-7FFF, regardless of CPU R/W, but only when M2 is high. - Pin 41 (Unknown /CE) always activates low in range $4xE0-4xEF, regardless of CPU R/W and M2. - Pin 42 (RF5A18 CPU2 /CE) always activates low in range $4xD0-4xDF, regardless of CPU R/W and M2. - Pin 29 (CIC-11) observed only high (with or without tsuushin card inserted). - Seems to be a /reset because it sets pins 52-57 low when this pin is low, and possibly lots of other things. - Card R/W is always high when this pin is low. - Pin 31 (CIC-10) observed only high (with or without tsuushin card inserted). - Pin 32 (CIC-15) observed high with tsuushin card inserted and low with no card inserted or when hot-removed. - Does not go high when hot-inserted or Famicom reset in low state, only high when card is present at power-on. - Pin 16 Pull-up of 20k to 5V is also required in order to avoid triggering reset. - Pin 16 seems to be related to pin 29. With pin 29 floating and pin 16 pulled high at power on, the chip runs for 5 seconds, then enters reset. - Tested 10k instead of 20k (per original PCB) on pin 16, found no difference in time or function. - Pin 69 has a high pulse of 11.9085 usec at any time that register $4xAC has not been read for 12.4892 seconds. - Each additional 12.4892 seconds generates another pulse. - It has very repeatable precision, at least 6 figures on each. - It is not synchronized to M2 or any other inputs. - Note that 12.4892 sec * 21.47727 MHz = 2^28, with an error of 0.075%. (Nominal would be 12.4986 sec.) - Note that 11.9085 usec * 21.47727 MHz = 2^8, with an error of 0.093%. (Nominal would be 11.9196 usec.) - Pins 52-56 drive the address pins of the Kanji ROM. (See notes below the LH5323M1 pinout.) - Pin 15 (Card R/W) is a non-inverted buffer of CPU R/W. This signal connects through the lid switch. - Pin 26 puts out a 3.58 MHz square wave, ~50% duty. This corresponds to 21.47727 MHz / 6. - Pin 79 (Exp 2) puts out a 95.95 kHz square wave, 93.7% duty. Clock source unknown. - Note that this seems similar to FDS serial bitrate. - Standalone chip can get into a 341.2 kHz mode when touching pin 80, though pulling 80 high or low doesn't correlate. - Either frequency, the negative pulse width is 650 nsec. - Pins 71-79 appear strikingly similar to an FDS interface. - CIRAM A10 follows PPU A10 by default.
RF5A18 CPU2 / Modem Controller
_____ / \ CPU2 A0 <- / 1 100 \ -- GND CPU2 A1 <- / 2 99 \ <> CPU2 D0 CPU2 A2 <- / 3 98 \ <> CPU2 D1 CPU2 A3 <- / 4 97 \ <> CPU2 D2 CPU2 A4 <- / 5 96 \ <> CPU2 D3 CPU2 A5 <- / 6 95 \ <> CPU2 D4 CPU2 A6 <- / 7 94 \ <> CPU2 D5 CPU2 A7 <- / 8 93 \ <> CPU2 D6 +5Vcc -- / 9 92 \ <> CPU2 D7 CPU2 A8 <- / 10 91 \ -- +5Vcc CPU2 A9 <- / 11 90 \ -> UART Tx (MSM6827L TXD) CPU2 A10 <- / 12 89 \ <- UART Rx (MSM6827L RXD) CPU2 A11 <- / 13 88 \ <- CPU A2 CPU2 A12 <- / 14 87 \ <- CPU A1 (n/c) CPU2 A13 <- / 15 86 \ <- CPU A0 (n/c) CPU2 A14 <- / 16 85 \ <- /CE (5C66-42) (n/c) CPU2 A15 <- / 17 84 \ <- P6-1 Lid Switch, Card R/W GND -- / 18 83 \ <- M2 (2.4576 MHz) (n/c) CPU2 M2 <- / 19 82 \ <> Card D7 CPU2 R/W <- / 20 81 \ <> Card D6 RAM /CE ($0000-1FFF) <- / 21 \ (n/c) ROM /CE ($C000-xFFF) <- / 22 O / P5 /CE ($4129 Only) <- / 23 80 / <> Card D5 (GND) CPU2 +Reset -> / 24 79 / <> Card D4 (GND) ? -> / 25 78 / -- GND /Internal ROM Enable -> / 26 Nintendo RF5A18 77 / <> Card D3 (5C66-68) CPU2 /Reset -> / 27 Package QFP-100, 0.65mm pitch 76 / <> Card D2 (10k up) CPU2 /IRQ -> / 28 75 / <> Card D1 (10k up) CPU2 /NMI -> / 29 Modem Controller 74 / <> Card D0 n/c -- / 30 CPU2 73 / <- Tone Rx DV / O 72 / <- Tone Rx D8 \ 71 / <- Tone Rx D4 +5Vcc -- \ 31 70 / <- Tone Rx D2 MSM6827L DATA <> \ 32 69 / <- Tone Rx D1 MSM6827L /INT -> \ 33 68 / -> Tone Rx GT MSM6827L /RD <- \ 34 67 / -> Exp P3-19 MSM6827L /WR <- \ 35 66 / <> Exp P3-18 MSM6827L EXCLK <- \ 36 65 / <> Exp P3-17 (n/c) $4120.2 <- \ 37 64 / -- +5Vcc Orientation: MSM6827L AD1 <- \ 38 63 / -> Modem P4-19 -------------------- MSM6827L AD0 <- \ 39 62 / -> /Phone Audio Enable 80 51 (n/c) CPU2 D0 <- \ 40 61 / -> /DTMF Output Enable | | (n/c) ? <- \ 41 60 / -> /Phone Off Hook .-----------. (4.9152 MHz) Exp P3-16 <- \ 42 59 / -> $4127.3 (n/c) 81-|O RF5A18 |-50 GND -- \ 43 58 / -> /Green LED | Nintendo | 19.6608MHz Xtal -- \ 44 57 / -> /Red LED 100-| GCD 8C O|-31 1k to Xtal -- \ 45 56 / -> MSM6827L +Reset \-----------' GND -- \ 46 55 / <- Audio from phone line | | (+5Vcc) $4126.0 -> \ 47 54 / <- Modem P4-28 01 30 (+5Vcc) !($4126.1) -> \ 48 53 / <- Modem P4-25 5C66-69 -> \ 49 52 / <- Switch SW1-4 Legend: n/c -- \ 50 51 / <- Switch SW1-2 ------------------------------ \ / --[RF5A18]-- Power, n/a \ / ->[RF5A18]<- RF5A18 input \ / <-[RF5A18]-> RF5A18 output V <>[RF5A18]<> Bidirectional Notes: - This chip contains its very own 65C02 CPU, with built-in ROM. - +5Vcc pins 9, 31, 64, 91 are all connected together internally. - GND pins 18, 43, 46, 78, 100 are all connected together internally. - 24, 26 are GND on the PCB, but function as noted. - 25 is GND on the PCB, but has internal protection diode from GND, suggesting it is a logic pin. - 47, 48 are +5Vcc on the PCB, but function as noted. - 15, 16, 17, 19, 22, 37, 40, 59 are n/c on the PCB, but function as noted. - 41 is n/c on the PCB, but has protection diode from GND, suggesting it may have a function. - Pin 42 (Exp 16) puts out a 4.92 MHz square wave, ~50% duty. This is 19.6608 MHz / 4. - CPU2 /Reset comes from RF5C66 pin 68 on new revisions and selectable with J1, J2 on old revisions: - J2 closed = RF5C66 pin 37 (default) - J1 closed = RF5C66 pin 68 - Pin 24 prevents CPU2 functioning when held high at power-on. If the pin is then driven low, the reset vector is then fetched after that. - Pin 24 can be freely used as a +reset at any time this way. - Pin 25 low at any time causes address bus to go to $FFFF and data bus shows a toggle on bits 2,5,6,7: period 208.7 usec, low for 7.93 usec. - Other data bits always low. - Shortly after applying power, the toggle has a lot of variations for a period of about 1.5 seconds, including a 225 msec gap where the bits are low. - The mentioned data bits all appear to have the same data. - Held low at power-on will fetch the reset vector later when driven high. - Held high at power-on, driven low later, enters the data bus toggle mode but: - Does not appear to fetch the reset vector when driven high after that. - Does execute code, possibly resuming from where it left off. - When pin 26 is set low (default case: This pin is tied directly to GND on the PCB): - Internal ROM is enabled in CPU2 range $E000-FFFF. - Open Bus in CPU2 range $C000-DFFF. - Pin 22 (ROM /CE) is enabled low in range $C000-DFFF - This mode allows ROM expansion at $C000-DFFF, with internal ROM (and its vector table) in place. - When pin 26 is set high: - Internal ROM is disabled, leaving open bus in CPU2 range $E000-FFFF. - Open Bus in CPU2 range $C000-DFFF. - Pin 22 (ROM /CE) is enabled low in the entire range $C000-FFFF. - This mode allows a totally custom external CPU2 ROM with its own interrupt vector table.
LH5323M1 Kanji Graphic ROM
_____ Note: Flat spot does not correspond to pin 1. / \ n/c -- / 12 11 \ -- n/c (5C66-52) A0 -> / 13 10 \ -- n/c CPU D0 <> / 14 9 \ <- A1 (5C66-53) CPU D1 <> / 15 8 \ <- A2 (5C66-54) CPU D2 <> / 16 7 \ <- A3 (5C66-55) GND -- / 17 6 \ -- GND CPU D3 <> / 18 5 \ <- A5 (CPU A0) CPU D4 <> / 19 4 \ -- n/c CPU D5 <> / 20 3 \ <- A6 (CPU A1) CPU D6 <> / 21 2 \ <- A7 (CPU A2) CPU D7 <> / 22 Nintendo LH5323M1 1 \ -- n/c / Package QFP-44 \ \ 0.8mm pitch / n/c -- \ 23 44 / <- A8 (CPU A3) n/c -- \ 24 Kanji Graphic 43 / <- A13 (CPU A8) (GND) /OE -- \ 25 ROM 42 / <- A16 (CPU A11) (CPU A6) A11 -> \ 26 41 / <- A4 (5C66-56) Orientation: (5C66-50) /CE -> \ 27 40 / -- n/c -------------------- GND -- \ 28 39 / -- n/c 33 23 (CPU A7) A12 -> \ 29 38 / -- +5Vcc | | (CPU A5) A10 -> \ 30 37 / <- A17 (5C66-57 Bankswitch) .-----------. n/c -- \ 31 36 / <- A15 (CPU A10) 34-| Nintendo O|-22 n/c -- \ 32 35 / -- n/c | CCR-01 | (CPU A4) A9 -> \ 33 34 / <- A14 (CPU A9) | LH5323M1 | \ / 44-|O 9528 D |-12 \ / '-----------/ \ / | | V 01 11 Notes: - 6 & 28 are connected together internally. - 17 has no measurable connection to 6 & 28. - All logic pins have protection diode from pin 17, suggesting this is the true GND. - Pin 25 also appears as a logic pin with respect to pin 17. - When pins 25 and 27 are both driven low, the data bus becomes an output. Otherwise it is hi-z. - Pins 13, 9, 8, 7, 41, 37 are controlled by the RF5C66. - Pins 13, 9, 8, 7, 41 are controlled with auto-increment function. - The value of these pins increments each M2 falling edge when the CPU is in range $5000-5FFF. - Pin 37 is a bankswitch, controlled by register $40B0.0 - At reset and when reading from register $40B0, these pins reset to 0. - The conditions resetting or maintaining the bankswitch pin to 1 are still unknown.
8633 CIC Host
_______ _______ | \_/ | (Guest CIC-2) Data 0 <> | 1 18 | -- +5Vcc (Guest CIC-1) Data 1 <> | 2 O 17 | -- n/c n/c -- | 3 8633 16 | -- n/c n/c -- | 4 15 | -> /Fail (5C66-32) n/c -- | 5 CIC 14 | -- n/c n/c -- | 6 Host 13 | -- n/c (5C66-26) Clock -> | 7 12 | <- 5C66-30 (Guest CIC-11) /Reset -> | 8 U8 11 | -> +Start (5C66-29) GND -- | 9 10 | -> /Reset (5C66-31) |_______________|
8634A CIC Guest
_______ _______ | \_/ | (Host CIC-2) Data 0 <> | 1 18 | -- +5Vcc (Host CIC-1) Data 1 <> | 2 O 17 | -- n/c n/c -- | 3 8634A 16 | ?? GND n/c -- | 4 15 | -- n/c n/c -- | 5 CIC 14 | -- n/c n/c -- | 6 Guest 13 | ?? +5V (5C66-26) Clock -> | 7 12 | ?? Card-33, n/c in Famicom Network System (Cap to 5V) /Reset -> | 8 11 | -> +Start (Host CIC-8) GND -- | 9 10 | -- n/c |_______________|
- Note: Some assumptions made on CIC chips based on similarity to F411A from Super NES.
8kByte CHR RAM
_______ _______ | \_/ | n/c? -- | 1 28 | -- +5Vcc PPU A12 -> | 2 O 27 | <- PPU /WR PPU A7 -> | 3 26 | <- +CE: U3=RF5C66 34/38, U4=PPU /A13 PPU A6 -> | 4 25 | <- PPU A8 PPU A5 -> | 5 LH5268 24 | <- PPU A9 PPU A4 -> | 6 CHR 23 | <- PPU A11 PPU A3 -> | 7 RAM 22 | <- /OE: PPU /RD PPU A2 -> | 8 U3/U4 21 | <- PPU A10 PPU A1 -> | 9 20 | <- /CE: U3=PPU A13, U4=RF5C66 34/38 PPU A0 -> | 10 19 | <> PPU D7 PPU D0 <> | 11 18 | <> PPU D6 PPU D1 <> | 12 17 | <> PPU D5 PPU D2 <> | 13 16 | <> PPU D4 GND -- | 14 15 | <> PPU D3 |_______________|
8kByte W-RAM
_______ _______ | \_/ | n/c? -- | 1 28 | -- +5Vcc CPU A12 -> | 2 O 27 | <- /WR: Card R/W (P6-2 Lid Switch) CPU A7 -> | 3 26 | <- +CE: RAM +CE CPU A6 -> | 4 25 | <- CPU A8 CPU A5 -> | 5 LH5268 24 | <- CPU A9 CPU A4 -> | 6 Built-in 23 | <- CPU A11 CPU A3 -> | 7 W-RAM 22 | <- /OE: GND CPU A2 -> | 8 U5 21 | <- Card A10 CPU A1 -> | 9 20 | <- /CE: Built-in RAM /CE CPU A0 -> | 10 19 | <> Card D7 Card D0 <> | 11 18 | <> Card D6 Card D1 <> | 12 17 | <> Card D5 Card D2 <> | 13 16 | <> Card D4 GND -- | 14 15 | <> Card D3 |_______________|
8kByte CPU2 RAM
_______ _______ | \_/ | n/c? -- | 1 28 | -- +5Vcc CPU2 A12 -> | 2 O 27 | <- /WR: CPU2 R/W CPU2 A7 -> | 3 26 | <- +CE: +5Vcc CPU2 A6 -> | 4 25 | <- CPU2 A8 CPU2 A5 -> | 5 LH5268 24 | <- CPU2 A9 CPU2 A4 -> | 6 CPU2 23 | <- CPU2 A11 CPU2 A3 -> | 7 RAM 22 | <- /OE: GND CPU2 A2 -> | 8 U6 21 | <- CPU2 A10 CPU2 A1 -> | 9 20 | <- /CE: CPU2 RAM /CE CPU2 A0 -> | 10 19 | <> CPU2 D7 CPU2 D0 <> | 11 18 | <> CPU2 D6 CPU2 D1 <> | 12 17 | <> CPU2 D5 CPU2 D2 <> | 13 16 | <> CPU2 D4 GND -- | 14 15 | <> CPU2 D3 |_______________|
P4: Modem Module Edge Connector
Famicom | Modem | Famicom Network System | Module | Network System __________ | | +5Vcc -- | 1 19 | <- 5A18-63 MSM6827L +Reset -> | 2 20 | <- Tone Rx GT MSM6827L AD0 <> | 3 21 | <- /Phone Audio Enable GND -- | 4 22 | -> Tone Rx DV MSM6827L AD1 <> | 5 23 | -> 5A18-55, Audio from phone line MSM6827L RXD <- | 6 24 | <- Tone Rx Xin, from 5C66-26 MSM6827L DATA <- | 7 25 | -> 5A18-53 MSM6827L TXD -> | 8 26 | -- GND MSM6827L /WR -> | 9 27 | <- /Phone Off Hook MSM6827L EXCLK -> | 10 28 | -> 5A18-54 MSM6827L /RD -> | 11 29 | <> 5C66-60 +5Vcc -- | 12 30 | <- /DTMF Output Enable Tone Rx D1 <- | 13 31 | <> 5C66-62 __________________________ MSM6827L /INT <- | 14 32 | <> 5C66-61 | Modem Module | +5Vcc -- | 15 33 | <- Audio from 2A03 | Orientation | Tone Rx D2 <- | 16 34 | -> Audio to RF | | Tone Rx D8 <- | 17 35 | -- GND | 19 _____________ 36 | Tone Rx D4 <- | 18 36 | -- GND | 1 |___________| 18 | |________| |________________________| Note: The modem module uses modem chip Oki MSM6827L and Dual Tone Receiver MC14LC5436P.
P2: Tsuushin Card Connector
Note that the tsuushin card may appear to have a metric 1mm pin pitch, but in fact it has an imperial 0.040" (40 thousandths) pin pitch.
Card | | Famicom Network System -----+--+------------------------- 1 |--| +5Vcc 2 |--| +5Vcc 3 |??| n/c in JRA-PAT, n/c in host 4 |??| n/c in JRA-PAT, Host has 10k pull-up only. 5 |<>| Card D0 6 |<>| Card D1 7 |<>| Card D2 8 |<>| Card D3 9 |<>| Card D4 10 |<>| Card D5 11 |<>| Card D6 12 |<>| Card D7 13 |<-| Card R/W (P6-2 Lid Switch) 14 |<-| M2 15 |<-| /ROMSEL 16 |<-| CPU A0 17 |<-| CPU A1 18 |<-| CPU A2 19 |<-| CPU A3 20 |<-| CPU A4 21 |<-| CPU A5 | | | | 22 |<-| CPU A6 23 |<-| CPU A7 24 |<-| CPU A8 25 |<-| CPU A9 26 |<-| CPU A10 27 |<-| CPU A11 28 |<-| CPU A12 29 |<-| CPU A13 30 |<-| CPU A14 31 |??| n/c in JRA-PAT, Host has 10k pull-up only. 32 |??| n/c in JRA-PAT, Host has 10k pull-up only. 33 |??| connected to Guest CIC-12 in JRA-PAT, n/c in host 34 |??| n/c in JRA-PAT, n/c in host 35 |->| Guest CIC-11 -> Host CIC-8 36 |<>| Guest CIC-1 <> Host CIC-2 37 |<>| Guest CIC-2 <> Host CIC-1 38 |<-| CIC Clock 39 |??| n/c in JRA-PAT, Host has 10k pull-up only. 40 |<-| RAM +CE (n/c in JRA-PAT) 41 |--| GND 42 |--| GND
P3: Expansion Connector
Outside | FNS | Outside _____________________ _________ / Orientation /| | | /____________________/ | /IRQ -> | 1 20 | -- +5Vcc |o|_| == |_||_|o|/ (95.94kHz Clock) 5C66-79 <- | 2 19 | -> 5A18-67 \_ _ _ _||_ _ _ _/| 5C66-78 -> | 3 18 | -> 5A18-66 |-| | || HVC-050| | 5C66-77 <- | 4 17 | -> 5A18-65 |-|_| || | | 5C66-76 <- | 5 16 | -> 5A18-42 (4.92MHz Clock) | || | | 5C66-75 <- | 6 15 | <> 5C66-64 | 20 __/__\__ 11 | | | | |o 1 |______| 10 o| | 5C66-74 -> | 7 14 | <> 5C66-65 | ________________ | | 5C66-73 -> | 8 13 | <> 5C66-66 |/_______________/|| | 5C66-72 -> | 9 12 | <> 5C66-67 ||______________|/ | | GND -- | 10 11 | <- 5C66-71 | | | |_______| | ______ | | |o | | | o| | \_____|/ |_____|/
P5: Expansion Connector
Note: This connector only exists on old revisions of Famicom Network System. Expansion P5 /CE is activated low specifically at CPU2 address $4129.
Outside | | Famicom Network System --------+--+------------------------- 9 |--| GND 8 |<>| CPU2 D5 7 |<>| CPU2 D4 6 |<>| CPU2 D3 5 |<>| CPU2 D2 4 |<>| CPU2 D1 3 |<>| CPU2 D0 2 |<-| Expansion P5 /CE 1 |--| +5V