Help with PCB ID

[Chuck Guzis]

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