Batt4.5V (-) ------------------ Pin8 GND Pin8 GND
Batt4.5V (+) ------------------ Pin7 +5V Pin7 +5V
The low-level XA/XB/YA/YB signal must be watched by software (the 300Hz interrupt is probably too slow to sense fast motions, so there's little chance to have the mouse driver running in background).
=== CPC Plus Compatibility ===