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| ==Pinout of 48-pin NES expansion port==
| | #REDIRECT [[Expansion port]] |
| +-------\
| |
| +5V -- |01 48| -- +5V
| |
| Gnd -- |02 47| -- Gnd
| |
| Audio in -> |03 46| -- NC
| |
| /NMI <- |04 45| -> out 2 ($4016 write data, bit 2)
| |
| A15 <- |05 44| -> out 1 ($4016 write data, bit 1)
| |
| EXP9 ?? |06 43| -> out 0 ($4016 write data, bit 0, strobe on sticks)
| |
| EXP8 ?? |07 42| ?? EXP0
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| EXP7 ?? |08 41| ?? EXP1
| |
| EXP6 ?? |09 40| ?? EXP2
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| EXP5 ?? |10 39| ?? EXP3
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| ($4017 read strobe) /OE for joypad 2 <- |11 38| ?? EXP4
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| joypad 1 D1 -> |12 37| -> /OE for joypad 1 ($4016 read strobe)
| |
| joypad 1 D3 xx |13 36| xx joypad 1 D4 (before inverting buffer)
| |
| /IRQ <> |14 35| xx joypad 1 D0 (likewise)
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| joypad 2 D2 -> |15 34| -> duplicate of pin 37
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| joypad 2 D3 xx |16 33| <- joypad 1 D2
| |
| duplicate of pin 11 <- |17 32| <> CPU D0
| |
| joypad 2 D4 xx |18 31| <> CPU D1
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| joypad 2 D0 xx |19 30| <> CPU D2
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| joypad 2 D1 -> |20 29| <> CPU D3
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| Video out <- |21 28| <> CPU D4
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| Audio out <- |22 27| <> CPU D5
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| unregulated power adapter vdd -- |23 26| <> CPU D6
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| 4.00MHz CIC CLK <- |24 25| <> CPU D7
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| +-------/
| |
| | |
| ===Extra notes===
| |
| * See [[Cartridge connector#Signal descriptions]] for notes about the ten EXP pins
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| * /NMI is an output because the PPU uses a push-pull driver, not open-drain signalling
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| * Joypad 1 and 2 D0, D3, and D4 are available as an input if no peripheral is connected to the corresponding joystick port that uses those bits:
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| ** e.g. D0 is unavailable if e.g. a [[Standard controller]] or [[Four score]] is plugged in, and
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| ** D3 and D4 are unavailable if a [[Zapper]], [[Arkanoid controller]], or [[Power Pad]] is plugged in.
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| | |
| [[Category:Pinouts]]
| |
