Help with PCB ID
imp at bsdimp.com
Sat Mar 13 15:10:11 CST 2021
On Sat, Mar 13, 2021, 1:04 PM Chuck Guzis via cctalk <cctalk at classiccmp.org>
> 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:
It matches my recollection of the day I took the one we had a school...
secretly so the teachers wouldn't get mad...
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