UNKNOWN CONNECTOR at the Atari.
| Pin | Name |
|---|---|
| 1 | D0 |
| 2 | D1 |
| 3 | D2 |
| 4 | D3 |
| 5 | D4 |
| 6 | D5 |
| 7 | D6 |
| 8 | D7 |
| 9 | Enable 80-8F |
| 10 | Enable 40-7F |
| 11 | Not Connected |
| 12 | Ground |
| 13 | Ground |
| 14 | Ground (System Clock 02 on 2 port) |
| 15 | A6 |
| 16 | A5 |
| 17 | A2 |
| 18 | Interlock |
| 19 | A0 |
| 20 | A1 |
| 21 | A3 |
| 22 | A4 |
| 23 | Ground |
| 24 | Ground (Video In on 2 port) |
| 25 | Ground |
| 26 | +5 VDC |
| 27 | A7 |
| 28 | Not Connected |
| 29 | A8 |
| 30 | Audio In (2 port) |
| 31 | A9 |
| 32 | A13 |
| 33 | A10 |
| 34 | A12 |
| 35 | A11 |
| 36 | Interlock |