If the matrix wiring is incompatible with one of the available GI keyboard scanner chips, consider using an Arduino Leonardo to do the encoding. That's the popular chip that all the "cool kids" are using to scan their custom keyboards. The native output is USB, but if you want serial output, to work with a vintage computer, you could change the keyboard scanner code (assuming you can program in C) and then you could scan your found keyboard. Bill Dudley This email is free of malware because I run Linux. On Fri, Aug 14, 2020 at 7:35 PM Richard Cini via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
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
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Rich Cini