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]