* 5V and GND are exchanged with each other, and,
* on CPC+ the buttons must be connected to a "select" line (instead of to GND).
'''Caution''' - there is no resistor in the supply lines - the 5V/GND pins connect directly to the computers '''2.4 AMPERE Ampere''' power supply - so, there's a good chance that the CPCs reversed polarity will '''destroy ''' any electrons electronics (capacitors, auto-fire circuits, etc) in connected PC joysticks.
Pin CPC+ PC ________________________