== Technical ==
Connects to expansion port 50pin edge connector. Reportedly it It uses only 4pins: VCC, GND, LPEN, D7. Uh, that is, without decoding It doesn't decode any address lines or/IORQ lines?.
Trigger Button ---> Request via output to Port FBFEh, then check CRTC input
Light Sensor ---> CRTC Light Pen Input