Help to ID Unibus board

Hello list, I've recently acquired a PDP-11/04 which in its past life was the controller of a CNC precision drill/router (not the network kind) system. Inside which have 2 boards (Unibus of course) described as below: First clue: Upper left hand corner says it's from "Advanced Controls Corp.". A quick search points to http://www.acsmotion.com as they seem to be in the same field, industrial/machine controls. Alas, their tech support doesn't even have a clue as to what a Unibus is... Both boards appear to be the same model/type, but one is a earlier revision with a lot of reworks; i.e. jumpers and 2 smaller daughterboards, of which the later revision board doesn't have. Each board have 2 BERG-like male connectors (50-pin and 40-pin) which (guessing here) connects to the actual drill/router itself. The board is made out of SSI/MSI/LSI TTL ICs. The most complex/prominent are the two 12bit Analog Devices DACs from the DAC80 variety, both made in the late 80s: DAC #1 - ADDAC80N (24-pin) - CBI-V - 8802 DAC #2 - ADDAC80D (24-pin) - CBI-V - 8811 I guess these are for the X-Y positioning, but of course I may be WAY out here.. Board #1 - S/N 11926 (sticker) - P/N 18992-103R (scribbled on handle) On the upper left hand corner: - Advanced Controls Corp. - PCB Detail No. 17795 Rev. H - ASSY No. 18992 Rev. - Replaces 17750 Board #2 - S/N 0000005077 (sticker) - P/N 18992-102R (scribbled on handle) On the upper left hand corner: - Advanced Controls Corp. - PCB Detail No. 17795 Rev. D - ASSY No. 17750 Rev. If anybody can positive ID these boards, it'd be great! If anybody has the programming docs for these, it'll be even greater! :-) /wai-sun p.s. These boards seems to have last tested OK on Oct 28, 2002 (from a "tested" sticker)! -- ___________________________________________________________ Sign-up for Ads Free at Mail.com http://promo.mail.com/adsfreejump.htm