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IBM 5.25" Diskette Drive Adapter
- Cabling Information


Internal drives  (connector P2)

Drive/s connected to 34-pin edge connector P2.

• Click here to see a cabling diagram.
• You need to use the particular cable shown at here.  The IBM controller expects it.  The cable manipulates both the motor-on and drive-select lines.
• Do not accidentally use the hard drive type of twisted cable.  Difference shown at here.
• Terminate the drive/s as appropriate, per the diagram at here.
• On the IBM 5150/5155/5160 motherboard, set the floppy drive count switches as appropriate - see here.
• Reminder: 1.2M floppy drives are not going to work on the IBM 5.25" Diskette Drive Adapter.

External drives  (connector J1)

Drive/s connected to 37-pin 'D' connector J1.

• Cabling and termination is as per connector P2.
• Connector J1 does not supply power to the drive.
• If connecting an external 360K drive, then set the floppy drive count switches on the IBM 5150/5155/5160 motherboard as appropriate - see here.   Details of a suitable control/data cable are at here and here.  Do not forget to power the drive.
• If you are using DOS 4 or earlier, DOS will present the first external 360K floppy drive (physical #2) as C:, and if present, the second external 360K floppy drive (physical #3) as D:
In later versions of DOS, drive letters for external floppy drives will follow the letters of hard drives.
• Click here for detailed information on how to use an external 3.5" diskette drive in order to access 720K diskettes.
• Reminder: 1.2M floppy drives are not going to work on the IBM 5.25" Diskette Drive Adapter.