| 22 | GND | | Z | GND |
| 21 | CD 0 | | Y | CA 0 |
| 20 | CD 1 | | X | CA 1 |
| 19 | CD 2 | | W | CA 2 |
| 18 | CD 3 | | V | CA 3 |
| 17 | CD 4 | | U | CA 4 |
| 16 | CD 5 | | T | CA 5 |
| 15 | CD 6 | | S | CA 6 |
| 14 | CD 7 | | R | CA 7 |
| 13 | DMA | | P | CA 8 |
| 12 | BA | | N | CA 9 |
| 11 | ROML | | M | CA 10 |
| 10 | I/O 2 | | L | CA 11 |
| 9 | EXROM | | K | CA 12 |
| 8 | GAME | | J | CA 13 |
| 7 | I/O 1 | | H | CA 14 |
| 6 | Dot Clock | | F | CA 15 |
| 5 | CR/W | | E | Ø2 |
| 4 | IRQ | | D | NMI |
| 3 | +5V | | C | RESET |
| 2 | +5V | | B | ROMH |
| 1 | GND | | A | GND |
| | 
| 1 | GND | | A | GND |
| 2 | +5V | | B | Flag 2 |
| 3 | Reset | | C | PB 0 |
| 4 | CNT 1 | | D | PB 1 |
| 5 | SP 1 | | E | PB 2 |
| 6 | CNT 2 | | F | PB 3 |
| 7 | SP 2 | | H | PB 4 |
| 8 | PC 2 | | J | PB 5 |
| 9 | Ser. ATN in | | K | PB 6 |
| 10 | 9 VAC | | L | PB 7 |
| 11 | 9 VAC | | M | PA 2 |
| 12 | GND | | N | GND |
| A-1 | GND |
| B-2 | +5V |
| C-3 | Cassette Motor |
| D-4 | Cassette Read |
| E-5 | Cassette Write |
| F-6 | Cassette Sense |
|