View source for Connector:Analogue joystick (CPC Plus only)

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 (or to both)? And, how they are wired on PCs accordingly?