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National Semiconductor MCU keyboard encoders



A number of keyboards have been found with MCU-based keyboard encoders from National Semiconductor. At present, there is no information to indicate that National Semiconductor were responsible for the firmware on these chips, and they may have only supplied chips fitted with customer-specific code.

Examples include:

Chip Family Date Other markings Keyboard
COP420-MCW/N NS COPS 8504 Lear Siegler ADM-11 keyboard
INS8048-6SHD/N Intel MCS-48 9106 341-0810-A, ©APPLE 90 Apple Keyboard II (Mitsumi)
INS8050-GTYA/N Intel MCS-48 8736 MT87M002B Acer KB101AS/CH