Another blast from the past. The keyboard of my CPM system, so heavy you could do serious damage with it. Each key base contains a magnetically operated Reed switch, while the magnets were sitting in the moving part. The Z80 SBC with SIO, PIO and 2k EEPROM running the show. Keyboard matrix completely re-wired to fit existing scheme. The function keys were specially configured to produce Wordstar text processor sequences. Data via serial RS232 line.
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