In message <8d.ddc9335.28fc54b5@aol.com>, you write: 

-> Either that, or docs on the WD chipsets used on these boards.  The board I'm
->  specifically interested in is the WD7000 which is an ESDI/SCSI combo.  The 
-> docs I have give a bunch of info on programming the SCSI side, but nothing o
-> n the ESDI side.

As far as I recall, the WD7000 was just a SCSI controller, not a SCSI/EDSI
combo.  The ESDI controllers were the WD1007 series (again, IIRC), which 
looked like a ST506 controller from the software POV.

--rafal

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Rafal Boni                                                  rafal@mediaone.net