Reverse-engineering WD1000, WD1001 hard disk controllers

jos jos.dreesen at
Tue Nov 22 10:14:06 CST 2016

On 20.11.2016 01:30, Al Kossow wrote:
> On 11/19/16 4:25 PM, dwight wrote:
> It is actually a controller for a TRS-80 but it was a WD1000 in disguise.
> what format board (5" or 8")? 8X300 or 305?
> I dumped and took pictures of a couple different styles which are up on
> bitsavers under westernDigital

The MFM disk controller for later version Lilith's is clearly based on a WD1001-05.
But uses a 8x305 iso 8x300.

Pic of PCB and dump of proms are on

The disk used is an imi-5018 15MB.


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