| pin | name | direction | description | color |
| 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 | |