[ClassicCMP] Re: What's a WD2793A chip? - test-drb@ccmp.vtda.org

5 Feb 2000

It sat as a mazzanine board on the 820 board, in place of the 1771 in order
to enable the 820 to handle MFM format.

regards,

Dick
-----Original Message-----
From: Joe &lt;rigdonj(a)intellistar.net&gt;
To: classiccmp(a)classiccmp.org &lt;classiccmp(a)classiccmp.org&gt;
Date: Saturday, February 05, 2000 1:26 PM
Subject: Re: What's a WD2793A chip?

...
 Richard,

   Exactly what was add-on supposed to do for the Xerox 820?

    Joe

At 08:46 AM 2/5/00 -0700, Richard wrote:
 There may well have been one of these.  I've
got a one or two of the ones a Denver company made for the Xerox 820 to insert a
1791/95 in place of the
1771.  I even have the writeup somewhere, but no software patches.  It just
seems that I never have both the mezzanine board and the doc at the same
time.

Dick
    -----Original Message-----
    From: No Name &lt;lsommo(a)hotmail.com&gt;
    To: classiccmp(a)classiccmp.org &lt;classiccmp(a)classiccmp.org&gt;
    Date: Saturday, February 05, 2000 8:49 AM
    Subject: Re: What's a WD2793A chip?

    Wasn't there an add-on developed for the Xerox 820/ Big Board that used the
2793? As I recall it was a a simpler (and less expensive) circuit
as compared to the other add-on being offered at the time. I had one and
lost it (as well as my 256K memory expansion board) during the course of my
moves. If anyone has the schematics for it I'd like to try and put another
one together.

    Lou

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