I've edited this table together for those that might have an old laptop floppy with a 26 pin connector and want to connect it to a regular 34 pin connector. Some interfaces don't use all the pins. In particular, pin 8 of the laptop floppy seems to have no equivalent on the 34 pin connector. The Dell GX-150 ribbon cable I probed had this pin unconnected.
3.5" Floppy Disk Pin Descriptionpin assignment pin assignment
1 GND 2 Density Select 3 GND 4 (reserved) 5 GND 6 (reserved) 7 GND 8 Index 9 GND 10 Motor Enable A 11 GND 12 Drive Sel B 13 GND 14 Drive Sel A 15 GND 16 Motor Enable B 17 GND 18 Direction 19 GND 20 Step 21 GND 22 Write Data 23 GND 24 Floppy Write Enable 25 GND 26 Track 0 27 GND 28 Write Protect 29 GND 30 Read Data 31 GND 32 Head Select 33 GND 34 Disk ChangeLaptop Floppy Pin Description
pin assignment pin assignment
1 +5v 14 Step 2 Index 15 GND 3 +5v 16 Write Data 4 Drive Sel 17 GND 5 +5v 18 Floppy Write Enable 6 Disk Change 19 GND 7 Not connected 20 Track 0 8 Ready 21 GND 9 Not connected 22 Write Protect 10 Motor Enable 23 GND 11 Not Connected 24 Read Data 12 Direction 25 GND 13 Density Select 26 Head Select