[vcf-midatlantic] Keyboard encoder chips?

Richard Cini rich.cini at gmail.com
Fri Aug 14 19:34:09 EDT 2020

All –


                I was recovering an ASCII keyboard from a video titling machine (no documents) and in it is a Clare/Pendar keyboard that’s in nice condition (#700223-K1-1). The gold-pinned ceramic encoder chip on it looks like a General Instruments “S0778”. The only other numbers/markings are “GI 3-24-70”. I have seen references to a “S077D” used in the Apple keyboard, but I have no data sheet on that. The other reference I thought might be “AY-3-2470” but no luck there either. Of course, either could be a date code, too.


                I have several GI data books (1977, 1980 and 1982, which would be the right timeframe for this keyboard) and the GI keyboard encoders were AY-5-2376 and AY-5-3600.


                Any clues would be appreciated. Thanks!





Rich Cini





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