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Connector pinout: Amiga External Diskdrive Amiga External Diskdrive 23 PIN D-SUB FEMALE at the Amiga. pin name direction description color 1 /RDY IN/OUT Disk Ready 2 /DKRD IN 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 IN/OUT Disk Removed From Drive-Latched Low 12 +5V OUT +5 Volts DC (250 mA max) 13 /SIDE OUT Select Disk Side (0=Upper, 1=Lower) 14 /WPRO IN/OUT Disk is Write Protected 15 /TKO IN/OUT 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 OUT +12 Volts DC (160 mA max, 540 mA surge