ISA MFM disk controllers
mcguire at neurotica.com
Sat Jun 20 02:06:50 CDT 2009
On Jun 19, 2009, at 10:40 PM, Mr Ian Primus wrote:
> Anyone remember the difference between the various Western Digital
> MFM disk controllers? I've got a few in front of me right now, and
> I'm trying to figure out which would be the best for this Compaq
> Portable 286.
> I've got the good ol' WD1002A-WX1, and what looks to be the bigger
> verison, the WD1002S-WX2, then another, even longer card, the one
> that came stock with the Compaq, the WD1015-PL03.
> Now, here's the dilemma. The stock card won't respond to the usual
> debug commands - they just freeze the computer. The original 20mb 3
> 1/2" Miniscribe hard drive is dead (won't even spin). I am going to
> replace it with a similar 3 1/2" form factor drive - the NEC D3142.
> (43mb! Woo!) I already got the drive formatted and working on the
> small WD1002A-WX1 card, but it's been a while since I worked with
> MFM controllers - and I seem to remember the WD1002S-WX2 being
> faster or something.
Wow. I used to know *all* of those part numbers, have been
shaking my head trying to jog my memory for the past few minutes, but
it seems that info is just gone. :-(
> Also, I don't remember the calculations for optimum interleave, I
> used 3, since that was the default....
You can use something like Spinrite to discover the proper
interleave for a disk subsystem, and it will even format in-place
(track at a time) and preserve data. I used it all the time, it was
Port Charlotte, FL
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