8255
Parallel Peripheral Interface.

    +--------------+
PA3 |1    +--+   40| PA4
PA2 |2           39| PA5
PA1 |3           38| PA6
PA0 |4           37| PA7
/RD |5           36| /WR
/CE |6           35| RST
GND |7           34| D0
 A1 |8           33| D1
 A0 |9           32| D2
PC7 |10   8255   31| D3
PC6 |11          30| D4
PC5 |12          29| D5
PC4 |13          28| D6
PC0 |14          27| D7
PC1 |15          26| VCC
PC2 |16          25| PB7
PC3 |17          24| PB6
PB0 |18          23| PB5
PB1 |19          22| PB4
PB2 |20          21| PB3
    +--------------+

[This information is part of the GIICM]