Western Digital WD 1002S-SHD card ??? - test-drb@ccmp.vtda.org

14 Feb 2000

This board is a SASI board made primarily to tap into the market grown
around the XEBEC and OMTI boards.  ADAPTEC somewhat later came out with a
series (40xx) which later pretty much owned the market.  They were all more
or less similar, but none were "real" SCSI,  in that (A) they didn't cave a
firmly established common command set, and (b) they didn't use all of the
soon-to-become-standard SCSI signals, certainly not entirely in the same
way.  By the time the standard was accepted, it was mostly the ADAPTEC
feature set that won out.

Nevertheless, Joe, you'll find that card can help you quite a little with
putting a hard disk in place on your old CP/M systems.  This can be helped
along with a "back-end-driver" which installs itself under CP/M as an
autocommand.  This sits above the BIOS, hence uses a 2-k lower system than
it would without it, but makes your SCSI hardware portable from one system
to another.  That's pretty handy in itself.

Dick

-----Original Message-----
From: Don Maslin &lt;donm(a)cts.com&gt;
To: classiccmp(a)classiccmp.org &lt;classiccmp(a)classiccmp.org&gt;
Date: Monday, February 14, 2000 11:26 PM
Subject: Re: Western Digital WD 1002S-SHD card ???

...

On Mon, 14 Feb 2000, Allison J Parent wrote:

>
> <  I visited a surplus dealer today and picked up an external hard drive
> <case that he was throwing out. The case has a Seagate 225 drive in it with
...
 > <some kind of Western Digital interface card.
The card has MFM connection o
...
 > <one end and a 50 pin header on the other. The
header is connected to a
> <cable that had a SCSI type plug on it. Does anyone know if the card is a
> <SCSI to MFM interface or what?
>
> Well St225 is MFM so the card is either a host to MFM bridge or SCSI(SASI)
...
 > to MFM bridge.
>
> The real answer is a part number on the card like WD1002-HDO (host interface
...
 > number).  Someone else may be able to confrm if
the SHD is SASI or at that
...
   time early
SCSI. 
TheRef45A says that it is SASI to ST-412.

 - don

  Allison