| D2 | <-> | 1 | ---Z80--- ---PIO--- |
40 | <-> | D3 |
| D7 | <-> | 2 | 39 | <-> | D4 | |
| D6 | <-> | 3 | 38 | <-> | D5 | |
| !CE | --> | 4 | 37 | <-- | !M1 | |
| C/!D | --> | 5 | 36 | <-- | !IORQ | |
| B/!A | --> | 6 | 35 | <-- | !RD | |
| PA7 | <-> | 7 | 34 | <-> | PB7 | |
| PA6 | <-> | 8 | 33 | <-> | PB6 | |
| PA5 | <-> | 9 | 32 | <-> | PB5 | |
| PA4 | <-> | 10 | 31 | <-> | PB4 | |
| GND | --- | 11 | 30 | <-> | PB3 | |
| PA3 | <-> | 12 | 29 | <-> | PB2 | |
| PA2 | <-> | 13 | 28 | <-> | PB1 | |
| PA1 | <-> | 14 | 27 | <-> | PB0 | |
| PA0 | <-> | 15 | 26 | --- | VCC | |
| !A_STB | -- | 16 | 25 | <-- | CLK | |
| !B_STB | -- | 17 | 24 | <-- | INT_EN_IN | |
| A_RDY | -- | 18 | 23 | --> | !INT | |
| D0 | <-> | 19 | 22 | --> | INT_EN_OUT | |
| D1 | <-> | 20 | 21 | --> | B_RDY |