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Pinout von Peripheral Interface Adapter (6821)
| VSS | 1 | O |
40 | <− |
CA1 | |
| PA0 | <> |
2 | 6821 | 39 | <> |
CA2 |
| PA1 | <> |
3 | 38 | >> |
IRQA | |
| PA2 | <> |
4 | 37 | >> |
IRQB | |
| PA3 | <> |
5 | 36 | <− |
RS0 | |
| PA4 | <> |
6 | 35 | <− |
RS1 | |
| PA5 | <> |
7 | 34 | <− |
RESET | |
| PA6 | <> |
8 | 33 | <> |
DB0 | |
| PA7 | <> |
9 | 32 | <> |
DB1 | |
| PB0 | <> |
10 | 31 | <> |
DB2 | |
| PB1 | <> |
11 | 30 | <> |
DB3 | |
| PB2 | <> |
12 | 29 | <> |
DB4 | |
| PB3 | <> |
13 | 28 | <> |
DB5 | |
| PB4 | <> |
14 | 27 | <> |
DB6 | |
| PB5 | <> |
15 | 26 | <> |
DB7 | |
| PB6 | <> |
16 | 25 | <− |
E | |
| PB7 | <> |
17 | 24 | <− |
CS1 | |
| CB1 | −> |
18 | 23 | <− |
CS2 | |
| CB2 | <> |
19 | 22 | <− |
CS0 | |
| VCC | 20 | 21 | <− |
R/W |