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From: brian@sdcsvax.UUCP (Brian Kantor)
Newsgroups: net.graphics,net.micro,net.micro.68k
Subject: graphics hardware help wanted - mystery circuit board
Message-ID: <829@sdcsvax.UUCP>
Date: Mon, 29-Apr-85 11:05:08 EDT
Article-I.D.: sdcsvax.829
Posted: Mon Apr 29 11:05:08 1985
Date-Received: Wed, 1-May-85 02:42:41 EDT
Organization: UCSD beer & pizza society
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Xref: watmath net.graphics:756 net.micro:10190 net.micro.68k:738

At the computer swap meet yesterday, I picked up a mystery circuit board
that appears to be a sophisticated graphics controller.  I'm listing
here a description of the board in the hopes that someone will recognize
it and perhaps tell me where I can find more documentation on it.  I'd
rather get it working than strip it down for parts.

Please reply by mail:

	Brian Kantor	UC San Diego

	decvax\ 	brian@ucsd.arpa
	akgua  >---  sdcsvax  --- brian
	ucbvax/		Kantor@Nosc 

This board is
	Multibus
	no connections on the P2 connector
	4-layer
	NEC 7220 graphics controller chip about an inch from the top,
		and about 3 inches in from the left side.
	24 each 4416 memory chips in an array covering the upper right
		quadrant of the board, (two rows of 12 chips, with a row
		of 74S299 and DP8304 chips above that)
	27128 prom (this one is marked 2ND PC/10-12-82/GFX000/640x416)
	21.84 MHz crystal in upper left corner
	12.00 MHz crystal in lower right corner
	4 position DIP switch marked S1
	8 position DIP switch marked S2
	10 pin edge connector on top left marked P3
	20 pin Berg connector on top center marked P4
	Markings:
		Board is silkscreened in white.
		chips are numbered U1 to U85
		marked "GRAPHICS CONTROLLER" on top right center
		marked "MADE IN USA" in upper middle center
		marked "2 REV 597650 <2>" where the P2 connector goes

If you know who made it, or where I can get a manual, or anything else
about this board, I'd really appreciate hearing from you!
	- Brian