| Pin | Name | Dir | Description |
|---|---|---|---|
| 1 | +12V | → | +12 VDC |
| 2 | +5V | → | +5 VDC |
| 3 | +5V | → | +5 VDC |
| 4 | /INDEX | ← | Sector hole passed sensor. |
| 5 | /DSEL1 | → | Drive Select 1 |
| 6 | DIR | → | Direction (0=In, 1=Dir) |
| 7 | /STEP | → | Moves head 1 step in DIR direction. |
| 8 | WRITEDATA | → | Write Data |
| 9 | /WRITEGATE | → | Write Gate |
| 10 | /TRACK00 | ← | Head is over Track 00 (outermost track) |
| 11 | /WRITEPROTECT | ← | Write protected disk (0=Write protected) |
| 12 | READDATA | ← | Data read from diskette. |
| 13 | /SIDESELECT | → | Side Select (0=Side 1, 1=Side 0) |
| 14 | +12V | → | +12 VDC |
| 15 | +12V | → | +12 VDC |
| 16 | +5V | → | +5 VDC |
| 17 | /DSEL1 | → | Select Drive 0 |
| 18 | /MOTOR | → | Motor On |
| 19 | READY | ← | Ready |
| 20 | GND | Ground | |
| 21 | GND | Ground | |
| 22 | GND | Ground | |
| 23 | GND | Ground | |
| 24 | GND | Ground | |
| 25 | GND | Ground |