name: 8255 function: uPD package: DIL,40 manufacturer: NEC added-by: Simon Skocir comment: 82c55 +--()--+ pa3 | 1 40| pa4 pa2 | 2 39| pa5 pa1 | 3 38| pa6 pa0 | 4 37| pa7 rd | 5 36| wr cs | 6 35| reset GND | 7 34| d0 a1 | 8 33| d1 a0 | 9 32| d2 pc7 |10 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 was added by a third party and may be incorrect. This pinout came from the Chipdir: http://www.chipdir.org/