MFM drives

From: Don Maslin <>
Date: Tue Jan 20 23:27:42 1998

On Tue, 20 Jan 1998, SUPRDAVE wrote:

> as I was going through my parts today, i decided to test some 5 old mfm
> controller cards I was given by someone at work. it turns out that 5 mfm hard
> drives i have have gone "bad" again (they worked previously), and all 5
> controller cards have failed. it seems the only drive combination i have that
> works is a kalok drive, and a full size adaptec controller card that came in
> the 286 im testing all these in. over the past year, i betcha i've bought and
> thrown away almost 40 bad controller cards! the drives i know worked before,
> so i can just call debug and low level them again. ive already tried cabling
> combinations, jumper and bios settings, swapping known good parts out, and so
> forth. has anyone else had a fantastic failure rate with mfm controller cards?
> seems like i have better luck with reviving hard drives. incidentally, would
> anyone know what the proper jumper settings would be for an 8bit mfm
> controller card? one is a WD1002-27X and the other is a WD1002A-WX1. they are
> similar in appearance, but minor changes in chip layout and jumper settings.
> both these cards won't init a good hard drive.
Coming to you by private e-mail, David.
                                                 - don
    Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives
         Chairman, Dina-SIG of the San Diego Computer Society
       Clinging tenaciously to the trailing edge of technology.
         Sysop - Elephant's Graveyard (CP/M) - 619-454-8412
        see old system support at
Received on Tue Jan 20 1998 - 23:27:42 GMT

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