Walter van Waard found a keyboard made by PROTON, a Dutch company from the 80ties that produced many 6502 and Z80 based computers and peripherals.
It looks like an ASCII keyboard with more function keys (F1-F8) than usual.
Production date is probably not before 1984 since the ICs have date codes from 1983.
No documentation or description is known.
On the PCB you see:
- The MC6802, an 6800 with 128bytes RAM and an internal clock oscillator
- The 74LS138 glue logic IC
- A 74LS14 with a potmeter and capacitor
- A MC145028 dual flip flop with some resistors and capacitors, perhaps a clock oscillator
- 2x MC6821 PIAs to sense the keyboard matrix and presumably serial I/O via bit-banging.
- A K1/K2 connector, where three wires are connected. One wire goes to a pin of the 6821 PIA, the other two are power supply 5V and ground.
- A keyboard matrix with many extra keys (F1-F8, cursor keys, CHAR Insert/Delete, numerical keyboard.
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