National Semiconductor MCU keyboard encoders
Contents
Overview
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 |
Documentation
- COP400 Microcontroller Family, section 9 from the COPS Family User’s Guide (split out from a PDF from alldatasheet.com)
- COP420/421/422 and COP320/321/322 datasheet (the remainder of the aforementioned PDF)