NES expansion port pinout: Difference between revisions

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(#REDIRECT Expansion port)
 
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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
                                EXP7 ?? |08  41| ?? EXP1
                                EXP6 ?? |09  40| ?? EXP2
                                EXP5 ?? |10  39| ?? EXP3
($4017 read strobe) /OE for joypad 2 <- |11  38| ?? EXP4
                          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)
                          joypad 2 D2 -> |15  34| -> duplicate of pin 37
                          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
                          joypad 2 D0 xx |19  30| <> CPU D2
                          joypad 2 D1 -> |20  29| <> CPU D3
                            Video out <- |21  28| <> CPU D4
                            Audio out <- |22  27| <> CPU D5
        unregulated power adapter vdd -- |23  26| <> CPU D6
                      4.00MHz CIC CLK <- |24  25| <> CPU D7
                                        +-------/
 
===Extra notes===
* See [[Cartridge connector#Signal descriptions]] for notes about the ten EXP pins
* /NMI is an output because the PPU uses a push-pull driver, not open-drain signalling
* 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:
** e.g. D0 is unavailable if a [[Standard controller]] or [[Four score]] is plugged in, and
** D3 and D4 are unavailable if a [[Zapper]], [[Arkanoid controller]], or [[Power Pad]] is plugged in.
 
[[Category:Pinouts]]

Latest revision as of 08:30, 21 November 2017

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