Connector:Analogue joystick (CPC Plus only)

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Analogue Joystick Port (15 Pin SUB-D, female) (CPC Plus only)

The Analogue CPC+ Joystick port is somewhat similar to standard PC Joystick ports - with two important differences:

  • 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        +5V
 2   /Fire 1       Player 1 Fire 1
 3   X1            Player 1 X (lt/rt)
 4   /Joystick 1   GND
 5   +5V           GND
 6   Y1            Player 1 Y (up/dn)
 7   /Fire 2       Player 1 Fire 2
 8   Ground        +5V (Soundblaster: GND)
 9   Ground        +5V
 10  /Fire 1       Player 2 Fire 1
 11  X2            Player 2 X (lt/rt)
 12  /Joystick 2   GND (Soundblaster: Midi TxD)
 13  Y2            Player 2 Y (up/dn)
 14  /Fire 2       Player 2 Fire 2
 15  Ground        +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.
  • Not sure if the POTs on the CPCs analog X/Y inputs are to be wired to 5V or GND? And, how they are wired on PCs accordingly?
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