I'm thinking one serial and one cassette. The 8251 for the cassette.

I can't make out all the chips at the pins? The board was hand laid out. Is 
there nothing on the bottom but traces?

Dwight


________________________________
From: cctalk <cctalk-boun...@classiccmp.org> on behalf of Ethan via cctalk 
<cctalk@classiccmp.org>
Sent: Tuesday, July 10, 2018 6:43:12 PM
To: cctalk@classiccmp.org
Subject: Can anyone identify this S100 serial board?


Trying to identify the S100 serial board in my Imsai 8080.

https://imgur.com/eZyOVT5

I assume it was a kit. There are wires from behind one of the ICs that go
to DB25 on the rear, along with other DB25s with a few pins (maybe
cassette input.)

Any help appreciated.


--
: Ethan O'Toole


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