On 3/13/21 11:43 AM, Cory Heisterkamp via cctalk wrote: > I’m wondering if anyone recognizes this PCB. Double-sided, 74xx vintage, > measuring 14”x15”. There’s a “B.I.” logo in one corner, but no google match. > IC date codes are ’77/’78 vintage. > > There’s a pair of DB-25’s, a BCD encoder, and for some reason, two pots. DC > rectification appears to take place onboard. I thought perhaps the 112-7753 > marking might be a part or catalog number, however the flip side is marked > 112-1754, so perhaps not. > > Anyone recognize it? -Cory > > https://photos.app.goo.gl/dogAPxn7vLV87YRw9
Looks like the board from a B100. Note the connectors and switches on rear panel that seem to correspond with this: https://deskthority.net/wiki/File:Beehive_B100_terminal_back.jpg --Chuck
