HP-97S PRODICAL Digital Micrometer

[Katie Wasserman]

All 4000 series CMOS chips, same as used in the i/o pod. While pretty standard stuff for back then, I wonder if the HP engineers had a hand in designing this too.

The 2 main chips, 40108, were likely used to buffer serial data from the micrometer so that it could be feed to the BCD inputs on the i/o pod in one shot. The i/o pod did just the opposite, taking the BCD digits on the input, one at a time, and feeding them to the 97s.