| Pin | Name | Description |
|---|---|---|
| 1 | GND | Ground |
| 2 | +5V | +5 VDC |
| 3 | /BRESET | ? |
| 4 | P2/CSE | Data 2/Cassette Sense |
| 5 | P3 | Data 3 |
| 6 | P4 | Data 4 |
| 7 | P5 | Data 5 |
| 8 | RxC | Receive Clock |
| 9 | ATN | Attention? |
| 10 | +9V | +9 VAC |
| 11 | +9V | +9 VAC |
| 12 | GND | Ground |
| A | GND | Ground |
| B | P0 | Data 0 |
| C | RxD | Receive Data |
| D | RTS | Request to Send |
| E | DTR | Data Terminal Ready |
| F | P7 | Data 7 |
| H | DCD | Data Carrier Detect |
| J | P6 | Data 6 |
| K | CTS | Clear to Send |
| L | DSR | Data Set Ready |
| M | TxD | Transmit Data |
| N | GND | Ground |
