 34 pin IDC male connector at the controller (control connector) | 
(At the controller)
(At the harddisk)
20 PIN IDC MALE at the Controller. 20 PIN IDC FEMALE at the Harddisk. Control connector| Pin | Name | Description |
|---|
| 2 | | Head Sel 3 |
| 4 | | Head Sel 2 |
| 6 | | Write Gate |
| 8 | | Config/Stat Data |
| 10 | | Transfer Acknowledge |
| 12 | | Attention |
| 14 | | Head Sel 0 |
| 16 | | Sect/Add MK Found |
| 18 | | Head Sel 1 |
| 20 | | Index |
| 22 | | Ready |
| 24 | | Transfer Request |
| 26 | | Drive Sel 1 |
| 28 | | Drive Sel 2 |
| 30 | | Drive Sel 3 |
| 32 | | Read Gate |
| 34 | | Command Data |
Note: All odd are GND, Ground.Data connector| Pin | Name | Description |
|---|
| 1 | | Drive Selected |
| 2 | | Sect/Add MK Found |
| 3 | | Seek Complete |
| 4 | | Address Mark Enable |
| 5 | | (reserved, for step mode) |
| 6 | GND | Ground |
| 7 | | Write Clock+ |
| 8 | | Write Clock- |
| 9 | | Cartridge Changed |
| 10 | | Read Ref Clock+ |
| 11 | | Read Ref Clock- |
| 12 | GND | Ground |
| 13 | | NRZ Write Data+ |
| 14 | | NRZ Write Data- |
| 15 | GND | Ground |
| 16 | GND | Ground |
| 17 | | NRZ Read Data+ |
| 18 | | NRZ Read Data- |
| 19 | GND | Ground |
| 20 | GND | Ground |
|  34 pin IDC female connector at the hard disk (control connector) |
