* 5V and GND are exchanged with each other, and,
* on CPC+ the buttons must be connected to a "select" line (instead of to GND).
Pin CPC+ PC 1 Ground GND (Pot common) +5V 2 /Fire 1 Player 1 Fire 1 3 Pot X1 Player 1 X (lt/rt) 4 /Joystick 1 GND 5 +5V GND 6 Pot Y1 Player 1 Y (up/dn) 7 /Fire 2 Player 1 Fire 2 8 Ground GND (Pot common) +5V (Soundblaster: GND) 9 Ground GND (Pot common) +5V 10 /Fire 1 Player 2 Fire 1 11 Pot X2 Player 2 X (lt/rt) 12 /Joystick 2 GND (Soundblaster: Midi TxD) 13 Pot Y2 Player 2 Y (up/dn) 14 /Fire 2 Player 2 Fire 2 15 Ground GND (Pot common) +5V (Soundblaster: Midi RxD)
* Two analogue joysticks could be connected by using an Y-cable. The Fire signals are the same as for the normal (digital) joystick port. Joystick 1 buttons should be connected to Pin 2,4,6, and joystick 2 buttons to Pin 10,12,14. Like the digital [[Joystick Y-cables]] the analog Y-cable should have '''diodes''' in the button lines.
* The A/D inputs have an input range of 0V (data = 00) to 2.5V (data = 3Fh), and an input impedance of 180k to Vcc.