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Connector pinout: Internal Diskdrive Internal Diskdrive 34 PIN IDC MALE at the computer & diskdrives pin name direction description color 1 GND - Ground 2 /REDWC OUT Density Select 3 GND - Ground 4 n/c Reserved 5 GND - Ground 6 n/c Reserved 7 GND - Ground 8 /INDEX IN Index 9 GND - Ground 10 /MOTEA OUT Motor Enable A 11 GND - Ground 12 /DRVSB OUT Drive Sel B 13 GND - Ground 14 /DRVSA OUT Drive Sel A 15 GND - Ground 16 /MOTEB OUT Motor Enable B 17 RES - Reserved 18 /DIR OUT Direction 19 GND - Ground 20 /STEP OUT Step 21 GND - Ground 22 /WDATE OUT Write Data 23 GND - Ground 24 /WGATE OUT Floppy Write Enable 25 GND - Ground 26 /TRK00 IN Track 0 27 RES - Reserved 28 /WPT IN Write Protect 29 GND - Ground 30 /RDATA IN Read Data 31 GND - Ground 32 /SIDE1 OUT Head Select 33 GND - Ground 34 /DSKCHG OUT Disk Change