# Amiga External Diskdrive

(At the Amiga)

23 PIN D-SUB FEMALE at the Amiga.

Pin | Name | Dir | 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 | OC | Disk Motor Control
9 | /SEL2 | OC | Select Drive 2
10 | /DRES | OC | 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 | OC | Disk Write Enable
17 | /DKWD | OC | Disk Write Data
18 | /STEP | OC | Step the Head-Pulse, First low, then high
19 | DIR | OC | Select Head Direction (0=Inner, 1=Outer)
20 | /SEL3 | OC | Select Drive 3
21 | /SEL1 | OC | Select Drive 1
22 | /INDEX | OC | Disk Index Pulse
23 | +12V |  | +12 Volts DC (160 mA max, 540 mA surge