Famicom Network System: Revision history

4 May 2021

• curprev 02:1002:10, 4 May 2021‎ Ben Boldt talk contribs‎ 117,685 bytes +935‎ →‎CPU2 Known Registers: Added some control register bits that affect pin 90 (MSM6827L TXD)
• curprev 01:1501:15, 4 May 2021‎ Ben Boldt talk contribs‎ 116,750 bytes 0‎ →‎RF5A18 CPU2 / Modem Controller: Corrected RF5A18 pins 38, 39 are outputs only, pins 65, 66 are input only (none of those appear to behave bidirectional).
• curprev 00:1900:19, 4 May 2021‎ Ben Boldt talk contribs‎ 116,750 bytes +57‎ →‎CPU2 Known Registers: Note that Pin 32 is a push-pull output when set as output mode in $4120.6
• curprev 00:0800:08, 4 May 2021‎ Ben Boldt talk contribs‎ 116,693 bytes +579‎ Added info for $40D5.4 frequency depending on value written to $4114 bits 1 and 0.

2 May 2021

• curprev 02:0402:04, 2 May 2021‎ Ben Boldt talk contribs‎ 116,114 bytes +383‎ →‎CPU2 Known Registers: Added details for $4120/$4121 input/output modes for pin 32.
• curprev 01:3001:30, 2 May 2021‎ Ben Boldt talk contribs‎ 115,731 bytes −43‎ Updated push-pull vs. open drain configuration of Exp P3-17,18,19 via Famicom register $40D4.
• curprev 00:1500:15, 2 May 2021‎ Ben Boldt talk contribs‎ m 115,774 bytes −68‎ →‎Known Registers: cleanup

1 May 2021

• curprev 23:3023:30, 1 May 2021‎ Ben Boldt talk contribs‎ 115,842 bytes +313‎ Found more connections with register $40D6, depending on CPU2 registers $4112 and $4113.
• curprev 01:4501:45, 1 May 2021‎ Ben Boldt talk contribs‎ 115,529 bytes +1,492‎ Added /IRQ pin to CPU2, removed +IRQ (can't replicate that), added info about $412F.5 IRQ

27 April 2021

• curprev 15:1415:14, 27 April 2021‎ Ben Boldt talk contribs‎ 114,037 bytes +432‎ →‎CPU2 Known Registers: Corrected errors in register $4127 reference data.

26 April 2021

• curprev 04:4904:49, 26 April 2021‎ Ben Boldt talk contribs‎ m 113,605 bytes +411‎ →‎Commands Written by the Famicom to CPU2: Cleanup
• curprev 02:5502:55, 26 April 2021‎ Ben Boldt talk contribs‎ m 113,194 bytes −14‎ →‎Commands Written by the Famicom to CPU2

21 April 2021

• curprev 04:4904:49, 21 April 2021‎ Joe talk contribs‎ 113,208 bytes +540‎ →‎Commands Written by the Famicom to CPU2: there's a lot going on in command $00

15 April 2021

• curprev 22:5422:54, 15 April 2021‎ Ben Boldt talk contribs‎ 112,668 bytes +113‎ →‎CPU2 Known Registers: Added additional $4112 read bit observations.
• curprev 22:4322:43, 15 April 2021‎ Ben Boldt talk contribs‎ 112,555 bytes +716‎ →‎CPU2 Known Registers: Added a few small observations.

12 April 2021

• curprev 02:0902:09, 12 April 2021‎ Ben Boldt talk contribs‎ 111,839 bytes +842‎ →‎CPU2 Known Registers: Added newly-found info about IRQ timer in registers $4104,5,6,7 and $412F.6. It is similar to the NMI timer found by Joe.
• curprev 00:3300:33, 12 April 2021‎ Ben Boldt talk contribs‎ m 110,997 bytes +224‎ →‎CPU2 Known Registers: Update "Read Has Data" column and change "(unknown)" read bits to "(unlikely to exist)" based on observed internal open bus behavior.

11 April 2021

• curprev 23:3523:35, 11 April 2021‎ Ben Boldt talk contribs‎ 110,773 bytes +318‎ →‎Commands Written by the Famicom to CPU2: Cleanup.
• curprev 23:0323:03, 11 April 2021‎ Ben Boldt talk contribs‎ 110,455 bytes +40‎ →‎CPU2 Known Registers: Added $4102.0 = NMI timer loop.
• curprev 22:4322:43, 11 April 2021‎ Ben Boldt talk contribs‎ 110,415 bytes +683‎ →‎CPU2 Known Registers: Added info found about timer NMI.

10 April 2021

• curprev 20:5120:51, 10 April 2021‎ Ben Boldt talk contribs‎ 109,732 bytes +59‎ →‎RF5A18 Internal 65C02 CPU: Measured CPU2 clock speed and found that it is 2.4576MHz.

7 April 2021

• curprev 20:4920:49, 7 April 2021‎ Ben Boldt talk contribs‎ 109,673 bytes −76‎ Undo revision 18582: Theoretically pins 43-46 could be A8-A11, I don't want to exclude that.
• curprev 20:4320:43, 7 April 2021‎ Ben Boldt talk contribs‎ 109,749 bytes +76‎ →‎Disk Drive Support: Updated statement about internal DRAM, not really possible.
• curprev 02:5402:54, 7 April 2021‎ Quietust talk contribs‎ m 109,673 bytes +8‎ for completeness, repeat the "$0027 = ~33ms" here

6 April 2021

• curprev 22:4022:40, 6 April 2021‎ Ben Boldt talk contribs‎ 109,665 bytes +54‎ →‎CPU2 Known Registers: Added clock source theory to Joe's awesome NMI findings.
• curprev 04:2704:27, 6 April 2021‎ Joe talk contribs‎ 109,611 bytes −188‎ →‎CPU2 Known Registers: Found the dialing code. It uses $4100/$4101/$4102 to control the time between NMIs.

5 April 2021

• curprev 02:3802:38, 5 April 2021‎ Ben Boldt talk contribs‎ m 109,799 bytes 0‎ →‎RF5A18 CPU2 / Modem Controller: Corrected error I made on Jan 29, 2021 where RF5A18 pin 40 lost its (n/c) label.

4 April 2021

• curprev 20:0120:01, 4 April 2021‎ Ben Boldt talk contribs‎ 109,799 bytes +448‎ Updated modem signals

3 April 2021

• curprev 05:0505:05, 3 April 2021‎ Joe talk contribs‎ 109,351 bytes −1,642‎ →‎CPU2 Commands with CRC key bytes
• curprev 05:0505:05, 3 April 2021‎ Joe talk contribs‎ 110,993 bytes +32‎ →‎Commands Written by the Famicom to CPU2: better identifiers

2 April 2021

• curprev 23:1623:16, 2 April 2021‎ Ben Boldt talk contribs‎ 110,961 bytes +1,629‎ →‎CPU2 Commands: Added table for connection status byte used in $80,81,82 response commands.
• curprev 16:2616:26, 2 April 2021‎ Ben Boldt talk contribs‎ 109,332 bytes +87‎ →‎Commands Written by the Famicom to CPU2: Added $80/$81/$82 status bytes found in CPU2 ROM.
• curprev 15:5715:57, 2 April 2021‎ Ben Boldt talk contribs‎ 109,245 bytes +1,509‎ →‎CPU2 Commands: Added some more CPU2 response commands.

1 April 2021

• curprev 23:1423:14, 1 April 2021‎ Ben Boldt talk contribs‎ m 107,736 bytes +2,056‎ →‎Known Registers: Added more collapsible wikitables to hide messy reference data.
• curprev 02:5402:54, 1 April 2021‎ Ben Boldt talk contribs‎ m 105,680 bytes +2,656‎ →‎CPU2 Known Registers: Hid a bunch of messy stuff inside collapsed tables
• curprev 02:2202:22, 1 April 2021‎ Ben Boldt talk contribs‎ 103,024 bytes +1,281‎ →‎Commands Written by the Famicom to CPU2: Added disassembly of JRA-PAT's use of $7D, put disassemblies into collapsed wikitables.
• curprev 00:2900:29, 1 April 2021‎ Ben Boldt talk contribs‎ m 101,743 bytes +20‎ →‎Commands Written by the Famicom to CPU2

31 March 2021

• curprev 23:5323:53, 31 March 2021‎ Ben Boldt talk contribs‎ 101,723 bytes +430‎ →‎CPU2 Commands: Added some more CPU2 messages observed from JRA-PAT and added revisions.
• curprev 05:1405:14, 31 March 2021‎ Ben Boldt talk contribs‎ 101,293 bytes +186‎ →‎Commands Written by the Famicom to CPU2: Improved Command $7D example disassembly
• curprev 04:4204:42, 31 March 2021‎ Ben Boldt talk contribs‎ 101,107 bytes +471‎ →‎Commands Written by the Famicom to CPU2: Added disassembly of arbitrary code that Super Mario Club writes with command $7D.

30 March 2021

• curprev 01:0201:02, 30 March 2021‎ Ben Boldt talk contribs‎ 100,636 bytes +418‎ →‎CPU2 Commands: Added examples of commands $03 and $7D from Super Mario Club

29 March 2021

• curprev 23:5323:53, 29 March 2021‎ Ben Boldt talk contribs‎ 100,218 bytes +13‎ →‎CPU2 Commands: Removed incorrect information about response command $80 from command $69. Added PiT command examples $60 and $00.
• curprev 16:0916:09, 29 March 2021‎ Ben Boldt talk contribs‎ 100,205 bytes 0‎ Swapped EXCLK and /RD of the MSM6827 chip as pointed out by Joe in the forum. No similar errors found testing the related signals.
• curprev 06:2406:24, 29 March 2021‎ Ben Boldt talk contribs‎ m 100,205 bytes −20‎ →‎CPU2 Commands
• curprev 01:4201:42, 29 March 2021‎ Ben Boldt talk contribs‎ 100,225 bytes +1,207‎ →‎CPU2 Commands: Added additional examples of response command $80 and added info that command $69 also generates response command $80.

27 March 2021

• curprev 17:0517:05, 27 March 2021‎ Ben Boldt talk contribs‎ m 99,018 bytes −6‎ →‎Commands Written by the Famicom to CPU2
• curprev 16:5616:56, 27 March 2021‎ Ben Boldt talk contribs‎ m 99,024 bytes +2‎ →‎Commands Written by the Famicom to CPU2
• curprev 16:5516:55, 27 March 2021‎ Ben Boldt talk contribs‎ 99,022 bytes +1,172‎ →‎Commands Written by the Famicom to CPU2: Added observed CPU2 commands from forum thread.
• curprev 14:2214:22, 27 March 2021‎ Ben Boldt talk contribs‎ 97,850 bytes +739‎ →‎CPU2 Commands: Added info about response $80 from CPU2 command $00.

18 March 2021

• curprev 03:3503:35, 18 March 2021‎ Ben Boldt talk contribs‎ m 97,111 bytes +635‎ →‎CPU2 Known Registers: Cleanup.

16 March 2021

• curprev 15:1015:10, 16 March 2021‎ Ben Boldt talk contribs‎ 96,476 bytes +9‎ →‎Commands Written by the Famicom to CPU2: Added a couple ways to disconnect the modem.
• curprev 14:4014:40, 16 March 2021‎ Ben Boldt talk contribs‎ 96,467 bytes +786‎ →‎CPU2 Known Registers: Added some IRQ / NMI info.

15 March 2021

• curprev 06:5306:53, 15 March 2021‎ Ben Boldt talk contribs‎ m 95,681 bytes +18‎ →‎Commands Written by the Famicom to CPU2: Reduced excessive width of command $11.
• curprev 04:0104:01, 15 March 2021‎ Ben Boldt talk contribs‎ m 95,663 bytes +45‎ →‎Commands Read by the Famicom from CPU2: Clarification in CPU2->FC command 0xC1.
• curprev 03:5403:54, 15 March 2021‎ Ben Boldt talk contribs‎ 95,618 bytes +1,623‎ →‎CPU2 Commands: Organized CPU2 read commands into a new section, added read commands $C0 and $C1.

14 March 2021

• curprev 23:1623:16, 14 March 2021‎ Ben Boldt talk contribs‎ 93,995 bytes +589‎ →‎CPU2 Commands: Added information to CPU2 command $03.
• curprev 22:0422:04, 14 March 2021‎ Ben Boldt talk contribs‎ m 93,406 bytes +20‎ →‎CPU2 Known Registers: Update CPU2 register $4102 description.
• curprev 21:2421:24, 14 March 2021‎ Ben Boldt talk contribs‎ 93,386 bytes +116‎ →‎CPU2 Commands: Added some CPU2 command responses.

28 February 2021

• curprev 22:3522:35, 28 February 2021‎ Ben Boldt talk contribs‎ 93,270 bytes +82‎ →‎Known Registers: Added note in register $40A3 about the effect on RF5C66 pin 79 as noted previously in the forum.

27 February 2021

• curprev 22:3222:32, 27 February 2021‎ Ben Boldt talk contribs‎ m 93,188 bytes −7‎ →‎CPU2 Commands: Minor fixes referencing CRC bytes within command descriptions.
• curprev 22:1522:15, 27 February 2021‎ Ben Boldt talk contribs‎ 93,195 bytes −144‎ →‎CPU2 Commands: Updated "lock" / encryption terminology to CRC as pointed out by lidnariq.
• curprev 10:0710:07, 27 February 2021‎ Ben Boldt talk contribs‎ 93,339 bytes +2,375‎ →‎CPU2 Commands: Added info about key/lock bytes.

20 February 2021

• curprev 03:5603:56, 20 February 2021‎ Ben Boldt talk contribs‎ m 90,964 bytes 0‎ →‎CPU2 Commands: Command $60 destination RAM address was incorrect.
• curprev 03:5003:50, 20 February 2021‎ Ben Boldt talk contribs‎ 90,964 bytes +758‎ →‎CPU2 Known Registers: More info for $4100/1/2

15 February 2021

• curprev 07:1907:19, 15 February 2021‎ Ben Boldt talk contribs‎ 90,206 bytes +938‎ →‎CPU2 Commands: Realized command $12 is also using the key bytes. Added info to command $10. Better use of brackets.
• curprev 05:4305:43, 15 February 2021‎ Ben Boldt talk contribs‎ 89,268 bytes +335‎ →‎Known Registers: Added Power-On-Reset values for some RF5C66 register write bits.
• curprev 04:1804:18, 15 February 2021‎ Ben Boldt talk contribs‎ m 88,933 bytes 0‎ →‎CPU2 Commands: $7C minor fixes
• curprev 04:1004:10, 15 February 2021‎ Ben Boldt talk contribs‎ 88,933 bytes +170‎ Added just a couple small items.
• curprev 04:0104:01, 15 February 2021‎ Ben Boldt talk contribs‎ 88,763 bytes +2,259‎ →‎Communication Between Famicom and CPU2: Added more command info.

14 February 2021

• curprev 23:5523:55, 14 February 2021‎ Ben Boldt talk contribs‎ 86,504 bytes +981‎ →‎CPU2 Known Registers: CPU2 register updates, list shadow registers at $0011=0016.
• curprev 22:0022:00, 14 February 2021‎ Ben Boldt talk contribs‎ 85,523 bytes −271‎ →‎Communication Between Famicom and CPU2: Removed "type" column. There is a way to read data but it does not work like I thought. Will add it back if new findings support it.
• curprev 21:4121:41, 14 February 2021‎ Ben Boldt talk contribs‎ 85,794 bytes +797‎ Details about CPU2 /Reset on older revisions Famicom Network System.
• curprev 20:2220:22, 14 February 2021‎ Ben Boldt talk contribs‎ 84,997 bytes +64‎ →‎CPU2 Command Bytes: Clarify hex values with '$'.
• curprev 05:2905:29, 14 February 2021‎ Ben Boldt talk contribs‎ 84,933 bytes +2,835‎ →‎Communication Between Famicom and CPU2: Improvements to command descriptions.

13 February 2021

• curprev 04:0904:09, 13 February 2021‎ Ben Boldt talk contribs‎ 82,098 bytes +534‎ →‎Communication Between Famicom and CPU2: Added column for which modes commands are supported in.

9 February 2021

• curprev 08:2208:22, 9 February 2021‎ Ben Boldt talk contribs‎ 81,564 bytes +5,471‎ →‎Communication Between Famicom and CPU2: Added Famicom <-> CPU2 command functions found by disassembling CPU2 ROM.

8 February 2021

• curprev 05:0705:07, 8 February 2021‎ Ben Boldt talk contribs‎ 76,093 bytes +2,684‎ Added information about Famicom <-> CPU2 communication, list of commands.

4 February 2021

• curprev 02:4002:40, 4 February 2021‎ Lidnariq talk contribs‎ m 73,409 bytes 0‎ discrete ≠ discreet
• curprev 01:5901:59, 4 February 2021‎ Ben Boldt talk contribs‎ 73,409 bytes +555‎ →‎Disk Drive Support: Added FDS pinout possibility

3 February 2021

• curprev 05:0805:08, 3 February 2021‎ Ben Boldt talk contribs‎ 72,854 bytes +614‎ →‎Known Registers: Added details about $40D5.
• curprev 04:0504:05, 3 February 2021‎ Ben Boldt talk contribs‎ 72,240 bytes +510‎ →‎Known Registers: Added more input pins found on $40D4.
• curprev 02:3902:39, 3 February 2021‎ Ben Boldt talk contribs‎ 71,730 bytes −57‎ Found +IRQ on CPU2, strangely enough.
• curprev 01:3101:31, 3 February 2021‎ Ben Boldt talk contribs‎ 71,787 bytes +115‎ Added more input bits found in RF5A18, including /NMI.

2 February 2021

• curprev 02:5702:57, 2 February 2021‎ Ben Boldt talk contribs‎ 71,672 bytes +58‎ Cleanup
• curprev 02:3602:36, 2 February 2021‎ Ben Boldt talk contribs‎ 71,614 bytes +709‎ →‎CPU2 Known Registers: Added more info about the Famicom <-> CPU2 interface registers.
• curprev 02:2502:25, 2 February 2021‎ Ben Boldt talk contribs‎ 70,905 bytes +1,248‎ →‎Known Registers: Added more information to $40Dx registers.

1 February 2021

• curprev 18:4918:49, 1 February 2021‎ Ben Boldt talk contribs‎ 69,657 bytes +2,730‎ Rearranged the page, added overview section, added disk drive section.
• curprev 18:0018:00, 1 February 2021‎ Ben Boldt talk contribs‎ m 66,927 bytes −63‎ Clarifications
• curprev 17:5117:51, 1 February 2021‎ Ben Boldt talk contribs‎ m 66,990 bytes +91‎ Clarifications
• curprev 05:2205:22, 1 February 2021‎ Ben Boldt talk contribs‎ 66,899 bytes +55‎ Added info about $40D3/4122 and $40D6/4113 register connections from CPU2 to Famicom CPU. Cleanup.
• curprev 03:0303:03, 1 February 2021‎ Ben Boldt talk contribs‎ 66,844 bytes +2,278‎ Added $40D0/4123, 40D1/4124, 40D2/4125 connections. Added registers $40D5 and $40D6

31 January 2021

• curprev 00:5400:54, 31 January 2021‎ Ben Boldt talk contribs‎ 64,566 bytes +83‎ →‎CPU2 Known Registers: Added theory that register $40D3 on Famicom CPU bus is dual-port with $4122 on CPU2 bus.

30 January 2021

• curprev 08:5908:59, 30 January 2021‎ Ben Boldt talk contribs‎ 64,483 bytes −39‎ →‎CPU2 Known Registers: Corrected error in CPU2 Register $4128
• curprev 05:0705:07, 30 January 2021‎ Ben Boldt talk contribs‎ 64,522 bytes +1,579‎ →‎CPU2 Known Registers: Added CPU2 read register information from $40 testing
• curprev 04:3104:31, 30 January 2021‎ Ben Boldt talk contribs‎ 62,943 bytes +5,141‎ →‎CPU2 Known Registers: Added more CPU2 register read bit findings based on runaway $8F branching and redoing $41 tests on the standalone RF5A18 setup.
• curprev 02:1302:13, 30 January 2021‎ Ben Boldt talk contribs‎ 57,802 bytes +464‎ →‎RF5A18 CPU2 Modem Controller: Confirmed correct CPU2 M2 pin on both of my setups is pin 19.

29 January 2021

• curprev 08:5208:52, 29 January 2021‎ Ben Boldt talk contribs‎ 57,338 bytes −113‎ Cleanup odds and ends
• curprev 08:2608:26, 29 January 2021‎ Ben Boldt talk contribs‎ 57,451 bytes +55‎ Added info about CPU2 register $4129 - P5 expansion port control.
• curprev 05:3605:36, 29 January 2021‎ Ben Boldt talk contribs‎ 57,396 bytes +1,275‎ →‎CPU2 Known Registers: Found a number of I/O pins in the CPU2 registers.

27 January 2021

• curprev 03:0803:08, 27 January 2021‎ Ben Boldt talk contribs‎ 56,121 bytes 0‎ →‎RF5A18 CPU2 Modem Controller: Identified /reset pin.