brian@sdcsvax.UUCP (Brian Kantor) (04/29/85)
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