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Connector pinout: MSX External Diskdrive MSX External Diskdrive 25 PIN D-SUB FEMALE at the Computer. pin name direction description color 1 +12V OUT +12 VDC 2 +5V OUT +5 VDC 3 +5V OUT +5 VDC 4 /INDEX IN Sector hole passed sensor. 5 /DSEL1 OUT Drive Select 1 6 DIR OUT Direction (0=In, 1=Dir) 7 /STEP OUT Moves head 1 step in DIR direction. 8 WRITEDATA OUT Write Data 9 /WRITEGATE OUT Write Gate 10 /TRACK00 IN Head is over Track 00 (outermost track) 11 /WRITEPROTECT IN Write protected disk (0=Write protected) 12 READDATA IN Data read from diskette. 13 /SIDESELECT OUT Side Select (0=Side 1, 1=Side 0) 14 +12V OUT +12 VDC 15 +12V OUT +12 VDC 16 +5V OUT +5 VDC 17 /DSEL1 OUT Select Drive 0 18 /MOTOR OUT Motor On 19 READY IN Ready 20 GND ------ Ground 21 GND ------ Ground 22 GND ------ Ground 23 GND ------ Ground 24 GND ------ Ground 25 GND ------ Ground