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Path: utzoo!watmath!clyde!floyd!harpo!seismo!ut-sally!mordor!sjc
From: sjc@mordor.UUCP
Newsgroups: net.ham-radio
Subject: Xerox 820 (Big Board) documentation
Message-ID: <2065@mordor.UUCP>
Date: Tue, 27-Mar-84 17:13:07 EST
Article-I.D.: mordor.2065
Posted: Tue Mar 27 17:13:07 1984
Date-Received: Wed, 28-Mar-84 07:11:04 EST
Organization: S-1 Project, LLNL
Lines: 49

This is a response to recent pleas for documentation on the Xerox 820, a
version of the Big Board CP/M system which the Xerox Outlet Store ((214)
960-3367) has been selling for $50 per board.

   Digital Research Computers
   PO Box 401565
   Garland, TX 75040
   (214) 271-3538
      For $5 they will send you a nice packet of schematics plus theory
      of operation plus directions on using their EPROM monitor. However,
      the Xerox version differs from theirs in at least three ways: parts
      are positioned and numbered differently on the board, connector
      pinouts are rearranged, and the last stages of the CRT driver have
      been redesigned.

   B.G. Micro
   PO Box 280298
   Dallas, TX 75228
   (214) 271-5546
      These people advertise in the March "Nuts and Volts" magazine that
      they will sell you a blank copy of the Xerox 820 board with EPROMS
      and "complete schematics" for $29.95 plus $2 shipping. Perhaps you
      could persuade them to sell you the schematics alone. I have not
      dealt with them.
   
   Xerox
   1341 Mockingbird Lane
   Dallas, TX 75247
   Attn: Bonnie Campbell
      The "820 Information Processor Development Guide", part number
      9R80368, is available for $40. It is not clear whether this
      contains software information, hardware information, both, or
      neither. We have one of these on order.

We also have schematics on order from a third source whose address I do
not have with me at the moment. I will post information to the net as
soon as I get it, so the best advice I can offer is to sit tight for a
week or so.

Meanwhile, anyone who has already gotten CP/M to run on an 820 board could
do us all a great service by posting pinouts, advice on the BIOS, etc.

Incidentally, I purchased a switching power supply for the 820 board from the
Xerox Outlet Store for $50. It offers all the voltages the board needs, but
lacks the +24V needed for 8" floppies.--Steve

	(S-1 Project, Lawrence Livermore National Laboratory)
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