| Pin | Name | Direction | Color | Description |
| 1 | CGND | ------ | | Chassis ground |
| 2 | CGND | ------ | | Chassis ground |
| 3 | CGND | ------ | | Chassis ground |
| 4 | CGND | ------ | | Chassis ground |
| 5 | -12V | OUT | | -12 VDC |
| 6 | +5V | OUT | | +5 VDC |
| 7 | +12V | OUT | | +12 VDC |
| 8 | +12V | OUT | | +12 VDC |
| 9 | n/c | - | | Not connected |
| 10 | PWM | ? | | Regulates speed of the drive |
| 11 | CA0 | ? | | Control line to send commands to the drive |
| 12 | CA1 | ? | | Control line to send commands to the drive |
| 13 | CA2 | ? | | Control line to send commands to the drive |
| 14 | LSTRB | ? | | Control line to send commands to the drive |
| 15 | WrReq- | ? | | Turns on the ability to write data to the drive |
| 16 | HdSel | ? | | Control line to send commands to the drive |
| 17 | Enbl2- | ? | | Enables the Rd line (else Rd is tristated) |
| 18 | Rd | IN | | Data actually read from the drive |
| 19 | Wr | OUT | | Data actually written to the drive |