IBM 4865 (External 3.5" floppy)

[Fred Cisin]

On Tue, 6 Oct 2009 DavidNoack at aol.com wrote:
> How can I connect an IBM 4865 external disk drive to an IBM PC 5150?

To the D37 connector on the back of the floppy disk controller board


Unless you run third party drivers, you will need to use DOS 3.20 or
above.
You will need to use driver.sys  (/F:2) for DOS to understand the drive.

If you are NOT using the OEM IBM BIOS, then you can use DRVPARM

(DRVPARM is present in both PC-DOS and MS-DOS 3.20 (undocumented in
PC-DOS), but will not be recognized if you have the OEM IBM 5150 or 5160
BIOS)

When formatting, specify /T:80/N:9



Later DOS permits /F:720