NES Expansion port

From HwB

Available at Nintendo NES. Located under the console.

[edit] Pinout 

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Pin Direction Name Description
01 --> VCC +5 VDC
02 --- GND Ground
03 <-- AIN Audio In
04 /NMI R/W or NMI?
05 --> CA15 Address 15?
06 C 51 Connected to Cartridge port pin 51
07 C 52 Connected to Cartridge port pin 52
08 C 53 Connected to Cartridge port pin 53
09 C 54 Connected to Cartridge port pin 54
10 C 55 Connected to Cartridge port pin 55
11 --> /C2R OE for stick 2?
12 <-- C1.1 Player #1 D1
13 <-- C1.3 Player #1 D3
14 /IRQ Interrupt
15 <-- C2.2 Player #2 D2
16 <-- C2.3 Player #2 D3
17 --> /C2R OE for stick 2?
18 <-- C2.4 Player #2 D4
19 <-- C2.0 Player #2 D0
20 <-- C2.1 Player #2 D1
21 --> AOUT Audio Out
22 --> VOUT Video Out
23 --> VDD +9 VDC
24 --> 4MHZ 4 MHz clock
25 D7 Data 7
26 D6 Data 6
27 D5 Data 5
28 D4 Data 4
29 D3 Data 3
30 D2 Data 2
31 D1 Data 1
32 D0 Data 0
33 --> C1.2 Player #1 D2
34 --> /C1R OE for stick #1?
35 --> C1.0 Player #1 D0
36 --> C1.4 Player #1 D4
37 --> /C1R OE for stick #1?
38 C 20 Connected to Cartridge port pin 20
39 C 19 Connected to Cartridge port pin 19
40 C 18 Connected to Cartridge port pin 18
41 C 17 Connected to Cartridge port pin 17
42 C 16 Connected to Cartridge port pin 16
43 --> C.0 Out0 (from CPU, strobe on sticks)
44 --> C.1 Out1 (from CPU)
45 --> C.2 Out1 (from CPU)
46 N/C not connected
47 --- GND Ground
48 <-- VCC +5 VDC

Note: Direction is console relative attached device.

Caution 1: Pin 21 and 22 may be swapped!

Caution 2: Direction show above may be unreliable.

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[edit] Sources

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