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ABIOSDSK.386: 32-bit disk access for your PS/2's MFM and ESDI drives

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Presenting ABIOSDSK.386: 32-bit disk access finally gets here for your
PS/2 with gigantic, clanking MFM drives and irreplaceable ESDI drives.

This has been about 35 years in coming, ever since as a sprightly 11
year old I was miffed that my fancy PS/2 P70 just wouldn't let me click
the "32-bit Disk Access", despite me barely understanding what was even
for. Of course, we now know that that means you can do things like open
a couple DOS windows on your 2MB machine and listen to the fixed disk
(or, more likely, a hard drive, since this wasn't happening on real IBM
computers with real IBM fixed disk adapters/A) thrash like crazy.

Nonetheless, here it is. It is based on IBM2ADSK.ADD from the OS/2 DDK
and WDCTRL from the Windows 3.1 DDK. So far, testing has been really
thorough: I tested it on 86Box with a Type 2 Model 80, ESDI adapter
card, PC DOS 3.30, 4MB and 2MB configurations, Windows 3.1. A test suite
program is included which tries to really exercise the disk and get
Windows' multitasking really crankin' with a couple DOS windows open.

Download it for yourself at:
https://github.com/sbooks-org/ABIOSDSK386
Direct link for 720kB floppy image, because how else would you get it on
your PS/2?
https://github.com/sbooks-org/ABIOSDSK386/releases/download/v0.90/ABIOSDSK.IMG

No warranty is implied, particularly given this is the kind of code
whose failure mode will mean you get to reformat your fixed disk and
reinstall everything.

I plan to do SCSI support next (it's easier than it sounds; it's just
another ABIOS interface). Can someone remind me what the state of
Windows 95 support for ABIOS disk adapters (MFM, ESDI, etc.) and the
PS/2 SCSI adapter is?

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ABIOSDSK.386: 32-bit disk access for your PS/2's MFM and ESDI drives "Josh Rodd" <joshua.at.rodd.dot.us@rodd.us> - 2026-08-08 02:48 +0000
  W95 and SCSI Louis Ohland <ohland@charter.net> - 2026-08-07 22:06 -0500
    Re: W95 and SCSI "Josh Rodd" <joshua.at.rodd.dot.us@rodd.us> - 2026-08-08 03:10 +0000
      Re: W95 and SCSI Louis Ohland <ohland@charter.net> - 2026-08-07 22:33 -0500
        Re: W95 and SCSI "Josh Rodd" <joshua.at.rodd.dot.us@rodd.us> - 2026-08-08 14:33 +0000
  FD had 32-bit BDA? Louis Ohland <ohland@charter.net> - 2026-08-07 22:08 -0500
    Re: FD had 32-bit BDA? "Josh Rodd" <joshua.at.rodd.dot.us@rodd.us> - 2026-08-08 03:11 +0000
    Re: FD had 32-bit BDA? "Josh Rodd" <joshua.at.rodd.dot.us@rodd.us> - 2026-08-08 03:12 +0000
  These are not the hard drives you are looking for Re: ABIOSDSK.386 Louis Ohland <ohland@charter.net> - 2026-08-08 07:03 -0500
    Re: These are not the hard drives you are looking for Re: ABIOSDSK.386 "Josh Rodd" <joshua.at.rodd.dot.us@rodd.us> - 2026-08-08 14:27 +0000
      -TC on A30 Re: ABIOSDSK.386 Louis Ohland <ohland@charter.net> - 2026-08-08 09:44 -0500
        Re: -TC on A30 Re: ABIOSDSK.386 "Josh Rodd" <joshua.at.rodd.dot.us@rodd.us> - 2026-08-08 14:55 +0000

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