Famicom Network System
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Memory Map
- $4xA0-$4xCF: RF5C66 Registers
- $4xD0-$4xDF: RF5A18 Registers
- $4xE0-$4xEF: Unimplemented (pin not hooked up)
- $5000-$5FFF: LH5323M1 ROM
- $6000-$7FFF: Card Bus RAM
Known Registers
| Address | Read | Write | Owner | Function |
|---|---|---|---|---|
| $4xA1 | Yes | Unknown | RF5C66 | Unknown Function.
|
| $4xA2 | Yes | Unknown | RF5C66 | Unknown Function.
|
| $4xA3 | No | Yes | RF5C66 | Unknown Function.
|
| $4xA5 | Yes | Unknown | RF5C66 | Unknown Function.
|
| $4xA6 | Yes | Yes | RF5C66 | Unknown Function.
|
| $4xA7 | Yes | Yes | RF5C66 | Unknown Function.
|
| $4xA8 | No | Yes | RF5C66 | Unknown Function.
|
| $4xA9 | Yes | Unknown | RF5C66 | Unknown Function.
|
| $4xAA | Yes | Unknown | RF5C66 | Unknown Function.
|
| $4xAB | No | Yes | RF5C66 | Unknown Function.
|
| $40AC | Unknown | Unknown | RF5C66 | Unknown Function.
|
| $4xAD | Yes | Yes | RF5C66 | Unknown Function.
|
| $4xAE | No | Yes | RF5C66 | Unknown Function.
|
| $4xB0 | Unknown | Unknown | RF5C66 | Unknown Function.
|
| $4xB1 | Yes | Yes | RF5C66 | Unknown Function.
|
| $4xC0 | Yes | Yes | RF5C66 | Unknown Function.
|
| $40D0 | Unknown | Yes | RF5A18 | Unknown Function.
|
| $40D1 | Unknown | Yes | RF5A18 | Unknown Function.
|
| $40D2 | Unknown | Yes | RF5A18 | Unknown Function.
|
| $4xD3 | Unknown | Yes | RF5A18 | Unknown Function.
|
| $4xD4 | Unknown | Yes | RF5A18 | Unknown Function.
|
Pinouts
_____
/ \
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
P4-24, P2-38, CIC-7 <- / 26 Nintendo RF5C66 77 / -> Exp P3-4
n/c -- / 27 Package QFP-100, 0.65mm pitch 76 / -> Exp P3-5
(n/c) ? <- / 28 75 / -> Exp P3-6
CIC-11 w/ filter -> / 29 Memory Controller 74 / <- Exp P3-7
CIC-12 <- / 30 73 / <- Exp P3-8
/ O 72 / <- Exp P3-9
\ 71 / <- Exp P3-11
CIC-10 -> \ 31 70 / -- GND
CIC-15 -> \ 32 69 / -> 5A18-49
5A18-27, 5C66-68 -> \ 33 68 / -> 5A18-27, 5C66-33 Orientation:
CHR RAM /CE (input) -> \ 34 67 / <- Exp P3-12 --------------------
Card RAM +CE <- \ 35 66 / <- Exp P3-13 80 51
(n/c) ? <- \ 36 65 / <- Exp P3-14 | |
(n/c) ? <- \ 37 64 / <- Exp P3-15 .-----------.
CHR RAM /CE <- \ 38 63 / <- ? (n/c) 81-|O Nintendo |-50
GND -- \ 39 62 / <- Modem P4-31 | RF5C66 |
W-RAM /CE ($6000-7FFF) <- \ 40 61 / <- Modem P4-32 100-| GCD 4R O|-31
(n/c) ? /CE ($4xE0-4xEF) <- \ 41 60 / <- Modem P4-29 \-----------'
5A18-85 /CE ($4xD0-4xDF) <- \ 42 59 / -- +5Vcc | |
(GND) ? -> \ 43 58 / -- n/c 01 30
(GND) ? -> \ 44 57 / -> 5323-37
(GND) ? -> \ 45 56 / -> 5323-41 Legend:
(GND) ? -> \ 46 55 / -> 5323-7 ------------------------------
CIRAM A10 <- \ 47 54 / -> 5323-8 --[RF5C66]-- Power
PPU A11 -> \ 48 53 / -> 5323-9 ->[RF5C66]<- RF5C66 input
PPU A10 -> \ 49 52 / -> 5323-13 <-[RF5C66]-> RF5C66 output
LH5323M1 /CE ($5000-5FFF) <- \ 50 51 / -- n/c <>[RF5C66]<> Bidirectional
\ / ??[RF5C66]?? Unknown
\ / 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, 29, 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.
- 24, 28, 36, 37, 41, 63 are n/c on the PCB, but have protection diodes from GND, suggesting they may have a function.
- Pins 41 and 42 ranges shown are duplicated at $Cxxx (i.e. ignores /ROMSEL).
- Pins 45-46, when pulled high, causes oscillation on pin 56.
- Pin 29 is a /reset. It sets pins 52-57 low when this pin is low, and possibly lots of other things.
- 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.
_____
/ \
U6 RAM A0 <- / 1 100 \ -- GND
U6 RAM A1 <- / 2 99 \ <> U6 RAM D0
U6 RAM A2 <- / 3 98 \ <> U6 RAM D1
U6 RAM A3 <- / 4 97 \ <> U6 RAM D2
U6 RAM A4 <- / 5 96 \ <> U6 RAM D3
U6 RAM A5 <- / 6 95 \ <> U6 RAM D4
U6 RAM A6 <- / 7 94 \ <> U6 RAM D5
U6 RAM A7 <- / 8 93 \ <> U6 RAM D6
+5Vcc -- / 9 92 \ <> U6 RAM D7
U6 RAM A8 <- / 10 91 \ -- +5Vcc
U6 RAM A9 <- / 11 90 \ -> P4-8
U6 RAM A10 <- / 12 89 \ <- P4-6
U6 RAM A11 <- / 13 88 \ <- CPU A2
U6 RAM A12 <- / 14 87 \ <- CPU A1
(n/c) ? <- / 15 86 \ <- CPU A0
(n/c) ? <- / 16 85 \ <- /CE (5C66-42)
(n/c) ? <- / 17 84 \ <- P6-1 Lid Switch, Card R/W
GND -- / 18 83 \ <- M2
(n/c) ? <- / 19 82 \ <> Card D7
U6 RAM /WR <- / 20 81 \ <> Card D6
U6 RAM /CE <- / 21 \
(n/c) ? <- / 22 O /
<UNKNOWN>, test point <- / 23 80 / <> Card D5
(GND) ? -> / 24 79 / <> Card D4
(GND) ? -> / 25 78 / -- GND
(GND) ? -> / 26 Nintendo RF5A18 77 / <> Card D3
5C66-33, 5C66-68 -> / 27 Package QFP-100, 0.65mm pitch 76 / <> Card D2
<UNKNOWN> 10k up -> / 28 75 / <> Card D1
<UNKNOWN> 10k up -> / 29 Modem Controller 74 / <> Card D0
n/c -- / 30 73 / <- Modem P4-22
/ O 72 / <- Modem P4-17
\ 71 / <- Modem P4-18
+5Vcc -- \ 31 70 / <- Modem P4-16
Modem P4-7 -> \ 32 69 / <- Modem P4-13
Modem P4-14 -> \ 33 68 / -> Modem P4-20 Orientation:
Modem P4-10 <- \ 34 67 / -> Exp P3-19 --------------------
Modem P4-9 <- \ 35 66 / <- Exp P3-18 80 51
Modem P4-11 <- \ 36 65 / <- Exp P3-17 | |
(n/c) ? <- \ 37 64 / -- +5Vcc .-----------.
Modem P4-5 <- \ 38 63 / -> Modem P4-19 81-|O RF5A18 |-50
Modem P4-3 <- \ 39 62 / -> Modem P4-21 | Nintendo |
(n/c) ? <- \ 40 61 / -> Modem P4-30 100-| GCD 8C O|-31
(n/c) ? <- \ 41 60 / -> Modem P4-27 \-----------'
Exp P3-16 <- \ 42 59 / -> ? (n/c) | |
GND -- \ 43 58 / -> Green LED, active low 01 30
19.6608MHz Xtal -- \ 44 57 / -> Red LED, active low
1k to Xtal -- \ 45 56 / -> Modem P4-2 Legend:
GND -- \ 46 55 / <- Modem P4-23 ------------------------------
(+5Vcc) ? -> \ 47 54 / <- Modem P4-28 --[RF5A18]-- Power
(+5Vcc) ? -> \ 48 53 / <- Modem 4-25 ->[RF5A18]<- RF5A18 input
5C66-69 -> \ 49 52 / <- Switch SW1-4 <-[RF5A18]-> RF5A18 output
n/c -- \ 50 51 / <- Switch SW1-2 <>[RF5A18]<> Bidirectional
\ / ??[RF5A18]?? Unknown
\ / f Famicom connection
\ / r ROM chip connection
V R RAM chip connection
Notes:
- +5Vcc pins 9, 31, 64, 91 are all connected together internally.
- GND pins 18, 43, 46, 78, 100 are all connected together internally.
- 24, 25, 26 are GND on the PCB, but have internal protection diodes from GND, suggesting they are logic pins.
- 47, 48 are +5Vcc on the PCB, but have internal protection diodes to +5Vcc, suggesting they are logic pins.
- 15, 16, 17, 19, 22, 37, 40, 41, 59 are n/c on the PCB, but have protection diodes from GND, suggesting they may have a function.
_____ Note: Flat spot does not correspond to pin 1.
/ \
n/c -- / 12 11 \ -- n/c
5C66-52 -> / 13 10 \ -- n/c
CPU D0 <> / 14 9 \ <- 5C66-53
CPU D1 <> / 15 8 \ <- 5C66-54
CPU D2 <> / 16 7 \ <- 5C66-55
GND -- / 17 6 \ -- GND
CPU D3 <> / 18 5 \ <- CPU A0
CPU D4 <> / 19 4 \ -- n/c
CPU D5 <> / 20 3 \ <- CPU A1
CPU D6 <> / 21 2 \ <- CPU A2
CPU D7 <> / 22 Nintendo LH5323M1 1 \ -- n/c
/ Package QFP-44 \
\ 0.8mm pitch /
n/c -- \ 23 44 / <- CPU A3
n/c -- \ 24 Seems like a 43 / <- CPU A8
(GND) /OE -- \ 25 ROM Chip 42 / <- CPU A11
CPU A6 -> \ 26 41 / <- 5C66-56
(5C66-50) /CE -> \ 27 40 / -- n/c
GND -- \ 28 39 / -- n/c
CPU A7 -> \ 29 38 / -- +5Vcc
CPU A5 -> \ 30 37 / <- 5C66-57
n/c -- \ 31 36 / <- CPU A10
n/c -- \ 32 35 / -- n/c
CPU A4 -> \ 33 34 / <- CPU A9
\ /
\ /
\ /
V
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. 27 could either be a /CE or W/R.
_______ _______
| \_/ |
Card-37 ?? | 1 18 | -- +5Vcc
Card-36 ?? | 2 O 17 | -- n/c
n/c -- | 3 8633 16 | -- n/c
n/c -- | 4 15 | -> 5C66-32
n/c -- | 5 CIC 14 | -- n/c
n/c -- | 6 Host 13 | -- n/c
P4-24, Card-38, 5C66-26 -> | 7 12 | <- 5C66-30
Card-35 ?? | 8 U8 11 | -> 5C66-29 (/Reset)
GND -- | 9 10 | -> 5C66-31
|_______________|
- Seems similar to F411A from Super NES.
_______ _______
| \_/ |
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
|_______________|
_______ _______
| \_/ |
n/c? -- | 1 28 | -- +5Vcc
CPU A12 -> | 2 O 27 | <- /WR: Card R/W (P6-2 Lid Switch)
CPU A7 -> | 3 26 | <- +CE: Card RAM +CE
CPU A6 -> | 4 25 | <- CPU A8
CPU A5 -> | 5 LH5268 24 | <- CPU A9
CPU A4 -> | 6 W-RAM 23 | <- CPU A11
CPU A3 -> | 7 22 | <- /OE: GND
CPU A2 -> | 8 U5 21 | <- Card A10
CPU A1 -> | 9 20 | <- /CE: W-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
|_______________|
_______ _______
| \_/ |
n/c? -- | 1 28 | -- +5Vcc
Modem RAM A12 -> | 2 O 27 | <- /WR: Modem RAM /WR
Modem RAM A7 -> | 3 26 | <- +CE: +5Vcc
Modem RAM A6 -> | 4 25 | <- Modem RAM A8
Modem RAM A5 -> | 5 LH5268 24 | <- Modem RAM A9
Modem RAM A4 -> | 6 Modem 23 | <- Modem RAM A11
Modem RAM A3 -> | 7 RAM 22 | <- /OE: GND
Modem RAM A2 -> | 8 U6 21 | <- Modem A10
Modem RAM A1 -> | 9 20 | <- /CE: Modem RAM /CE
Modem RAM A0 -> | 10 19 | <> Modem RAM D7
Modem RAM D0 <> | 11 18 | <> Modem RAM D6
Modem RAM D1 <> | 12 17 | <> Modem RAM D5
Modem RAM D2 <> | 13 16 | <> Modem RAM D4
GND -- | 14 15 | <> Modem RAM D3
|_______________|
P4: Modem Edge Connector
_________
| |
+5Vcc | 1 19 | 5A18-63
5A18-56 | 2 20 | 5A18-68
5A18-39 | 3 21 | 5A18-62
GND | 4 22 | 5A18-73
5A18-38 | 5 23 | 5A18-55
5A18-89 | 6 24 | 5C66-26, Card-38, 8633 CIC-7
5A18-32 | 7 25 | 5A18-53
5A18-90 | 8 26 | GND
5A18-35 | 9 27 | 5A18-60
5A18-34 | 10 28 | 5A18-54
5A18-36 | 11 29 | 5C66-60
+5Vcc | 12 30 | 5A18-61
5A18-69 | 13 31 | 5C66-62
5A18-33 | 14 32 | 5C66-61
+5Vcc | 15 33 | Audio from 2A03
5A18-70 | 16 34 | Audio to RF
5A18-72 | 17 35 | GND
5A18-71 | 18 36 | GND
|_______|
P2: Game Card Connector 1 | +5Vcc 2 | +5Vcc 3 | 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 CIC slave chip in JRA-PAT, n/c in host 34 | n/c in host 35 | 8633 CIC-8 36 | 8633 CIC-2 37 | 8633 CIC-1 38 | P4-24, 8633 CIC-7, 5C66-26 39 | n/c in JRA-PAT, Host has 10k pull-up only. 40 | Card RAM +CE (n/c in JRA-PAT) 41 | GND 42 | GND
P3: Expansion Connector
_________
| |
/IRQ | 1 20 | +5Vcc
5C66-79 | 2 19 | 5A18-67
5C66-78 | 3 18 | 5A18-66
5C66-77 | 4 17 | 5A18-65
5C66-76 | 5 16 | 5A18-42
5C66-75 | 6 15 | 5C66-64
| |
5C66-74 | 7 14 | 5C66-65
5C66-73 | 8 13 | 5C66-66
5C66-72 | 9 12 | 5C66-67
GND | 10 11 | 5C66-71
|_______|
