Home 

IBM 5160  -  Floppy Drive Support


  dos_bios_hardware.png


Cable and Termination

• Use the cable shown at here.

• For 5.25" drives, terminate as appropriate, per the diagram at here.



5.25" 360K floppy drives

DOS:  DOS 2.0 or later  (2.0 introduced DOS support for 360K floppies).
BIOS:  The IBM BIOS (all three revisions) on the IBM 5160 motherboard has full support for 360K drives/floppies.
Hardware:  The floppy controller (photo) that IBM supplied in the IBM 5160 supports 360K drives.



5.25" 1.2M floppy drives

DOS:  DOS 3.0 or later  (3.0 introduced DOS support for 1.2M floppies).
BIOS:  Motherboard BIOS revision of 11/08/82:  No support.
Motherboard BIOS revision of 01/10/86:  Full support
Motherboard BIOS revision of 05/09/86:  Full support
Hardware:  The floppy controller (photo) that IBM supplied in the IBM 5160 does not support 1.2M drives.


1.2M drives postdate the introduction of the IBM 5160. They were introduced with the IBM 5170 (IBM AT) in 1984.
Although IBM did later add support for them in the motherboard BIOS of the 5160, IBM did not offer a floppy controller for the 5160 that supported them.

To gain 1.2M operation:

* If your 5160 has one of the two 1986 dated BIOS', use a controller that supports 1.2M drives (supports High Density).

* If your 5160 has the 1982 dated BIOS, then you need both a suitable controller and suitable BIOS.
   One possible solution is here.  Another possible solution is here.



3.5" 720K diskette drives

DOS:  DOS 3.2 or later  (3.2 introduced DOS support for 720K diskettes).
BIOS:  Motherboard BIOS revision of 11/08/82:  Partial support.  See note 1 below.
Motherboard BIOS revision of 01/10/86:  Full support
Motherboard BIOS revision of 05/09/86:  Full support
Hardware:  The floppy controller (photo) that IBM supplied in the IBM 5160 supports 720K drives.


Note 1 11/08/82 BIOS
You can read from and write to 720K diskettes, but not format.
The ability to format can be gained by the use of DRIVER.SYS - see here.



3.5" 1.44M diskette drives

DOS:  DOS 3.3 or later  (3.3 introduced DOS support for 1.44M diskettes).
BIOS:  The IBM BIOS (all three revisions) on the IBM 5160 motherboard does not support 1.44M drives/diskettes.
Hardware:  The floppy controller (photo) that IBM supplied in the IBM 5160 does not support 1.44M drives.


720K diskette in 1.44M drive

If a 1.44M drive is connected to the IBM supplied controller, it will be discovered that 720K diskettes can be used.
You can read from and write to 720K diskettes, but not format.
The ability to format can be gained by the use of DRIVER.SYS - see here.

Note that the 1.44M drive can be attached to either the controller's internal connector or external connector.  For external connection, see here.


1.44M diskette in 1.44M drive

One possible solution is here.
Another possible solution is here.
Another possible solution is here.