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.
The following documents cover General Instrument keyboard encoder ICs: