I'm probably wrong but i think that both the controller and the bios would need to support high density in order to use a high density disk drive.

The hardware must support it first, then the software can do anything. Since the controller doesn't, no amount of software stuff will help. You could possibly identify the FDC on the computer and incapacitate it, i.e remove it completely if it is in a socket or sever its !CE line effectively making it invisible. Then you can add a new controller via ISA slot and you will probably need some software solution such as an option ROM to get high density support going.

Thallanor wrote:

Here is where my question comes in: is it possible to add support for HD drives through a BIOS extension:)

Short answer: Yes, if the hardware supports High Density drives.
Long answer: There's 2m-xbios.exe and 2m-abios.exe. But these are replacement BIOS routines for floppy drives under DOS.
I heard some of the Toshiba people here successfuly combined one of them into an ROM chip along with XTIDE Univeral BIOS..

Does your controller support being junpered as a secondary controller? This might do the trick. Or try to use driver.sys to set the drive parameters in DOS. I have a Compaq Deskpro converted to a diskette conversion station featuring 3 floppy drives, by using a secondary controller and driver.sys.
eisapc