Changes
/* Technical */
Connects to the Joystick port (not to the Lightpen input on the Expansion Port).
Input:
Light Sensor --> Keyboard.Row9.Bit1 (aka Joystick Down) (0=Light, 1=No Light)
Output:
Keyboard.Row9 is constantly held LOW during lightpen access
Keyboard.Row6 is constantly held HIGH during lightpen access
Keyboard.Colums aka PSG.Ext.PortA are configured as inputs aka HIGH-Z
The above LOW and HIGH (or HIGH-Z) levels seem to be misused as power supply GND and 5V. There seems to be no power-supply required for the CPC version (unlike the ZX Spectrum version, which connects to cassette EAR port, and which requires an external 9V battery).
== Pictures ==