| Pin | Name | Description | 
| 1 | /RDY | Disk Ready | 
| 2 | /DKRD | Disk Read Data | 
| 3 | GND | Ground | 
| 4 | GND | Ground | 
| 5 | GND | Ground | 
| 6 | GND | Ground | 
| 7 | GND | Ground | 
| 8 | /MTRXD | Disk Motor Control | 
| 9 | /SEL2 | Select Drive 2 | 
| 10 | /DRES | Disk Reset | 
| 11 | /CHNG | Disk Removed From Drive-Latched Low | 
| 12 | +5V | +5 Volts DC (250 mA max) | 
| 13 | /SIDE | Select Disk Side (0=Upper, 1=Lower) | 
| 14 | /WPRO | Disk is Write Protected | 
| 15 | /TKO | Drive Head position over Track 0 | 
| 16 | /DKWE | Disk Write Enable | 
| 17 | /DKWD | Disk Write Data | 
| 18 | /STEP | Step the Head-Pulse, First low, then high | 
| 19 | DIR | Select Head Direction (0=Inner, 1=Outer) | 
| 20 | /SEL3 | Select Drive 3 | 
| 21 | /SEL1 | Select Drive 1 | 
| 22 | /INDEX | Disk Index Pulse | 
| 23 | +12V | +12 Volts DC (160 mA max, 540 mA surge |