compaq portable plus problems

Tom Peters tpeters at
Sun Feb 3 22:54:06 CST 2008

Disassemble at C800:0CCC and look for a jmp instruction.


At 10:16 AM 2/3/2008 -0800, you wrote:
>When I am using debug to format a HD on an unknown controller, I'll do an
>unassemble at C800:5 and C800:6. The correct address will have a jmp
>Besides the HD formatting program on the utilities disk, going *way* back, I
>think Western Digital put out a formatting program WDFMT (?) that would allow
>the formatting of MFM HDs. I think there also might have been some 
>programs to do the same thing. Assuming the Simtel archives are still 
>around, I
>would expect to be able to find these programs there.
> > From: Roger Pugh <rogpugh at>
> >
> > does anyone know the correct incantation to low level format an MFM
> > drive, a rodime 351, driven by a Compaq controller board.
> >
> > I,ve tried with debug G=C800:5 to no avail.  there is no format program
> > there!.

222. [Philosophy] "An assertion is Zen only when it is itself an act and does
not refer to anything that is asserted in it." --(from Bruce Lee's book,
The Tao of Jeet Kune Do)
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