BU3266 / BU3270 pinout

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Custom Nintendo PIO chip found in the New Famicom (HVC-101). This replaces the U3 (139) and the U7/U8 (368).

          .---v---.  
INV 3I -> |01   32| -- +5V
INV 3O <- |02   31| ?? NC
    M2 -> |03   30| ?? NC
   A15 -> |04   29| -> /ROMSEL
   A14 -> |05   28| -> PPU /CE
   A13 -> |06   27| -> CPU RAM /CE
 P1 D0 -> |07   26| <- INV 2I
 P0 D0 -> |08   25| -> INV 2O
 P1 D1 -> |09   24| -> CPU D0
 P0 D1 -> |10   23| -> CPU D1
 P1 D2 -> |11   22| <- /INP0 ($4016 /RD)
 P0 D2 -> |12   21| <- /INP1 ($4017 /RD)
 P1 D3 -> |13   20| -> CPU D2
 P1 D4 -> |14   19| -> CPU D3
   GND -- |15   18| -> CPU D4
INV 1I -> |16   17| -> INV 1O
          '-------'  

Notes:

  • INV 1I/O (16-17) = Audio Inverter
  • INV 2I/O (25-26) = PA13 Inverter
  • INV 3I/O (01-02) = unused

Sources: