BU3270S

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Custom Nintendo PIO

Reference: Jacques Gagnon, http://nesdev.com/nes_pio_pinout.txt

         ________
   GND -|01 \/ 32|- +5v
    NC -|02    31|- NC
    M2 -|03    30|- NC
   A15 -|04    29|- /ROMSEL
   A14 -|05    28|- /DBE
   A13 -|06    27|- CS (U1)
 P1-D0 -|07    26|- INV-2I
 P0-D0 -|08    25|- INV-2O
 P1-D1 -|09    24|- D0
 P0-D1 -|10    23|- D1
 P1-D2 -|11    22|- /INP0
   +5v -|12    21|- /INP1
 P1-D3 -|13    20|- D2
 P1-D4 -|14    19|- D3
   GND -|15    18|- D4
INV-1I -|16    17|- INV-1O
         ¯¯¯¯¯¯¯¯
*   INV-1I/O (16-17) = Audio Inverter
**  INC-2I/O (25-26) = PA13 Inverter
*** They are three unused pins maybe there are 
    P0-D2,D3,D4 but I don't realy belive that.
    If this chip is also found in the Redesign
    NES, maybe someone can verify this.