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General Instrument

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Keyboard encoder ICs

Families AY-5-2376 and AY-5-3600 were either second-sourced to, or cloned by, SMC.

AY-5-3600 and AY-5-3600-PRO

Model AY-5-3600 is a 90-key quad-mode encoder. Each key generates a 9-bit code per mode, for a total of 3600 bits of ROM providing the key definitions. The standard model generates ASCII output.

Where the manufacturer needs to provide a different set of output codes, model AY-5-3600-PRO is used. This outputs only the scancodes, with the intention being that the output codes be used as the indexes into a PROM or EPROM containing the character definitions.

Documentation

The following documents cover General Instrument keyboard encoder ICs: