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

[[Analog Joysticks| 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 some 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).
* The ADC hardware in the CPC works only with 180kΩ potentiometers (unlike the software counters in PCs, which works with different types, in range 10K...300kΩ, or so)
'''Caution''' - there is no resistor in the supply lines - the 5V/GND pins connect directly to the computers '''2.4 Ampere''' power supply - so, there's a good chance that the CPCs reversed polarity will '''destroy''' any electronics (electrolyte capacitors, auto-fire circuits, etc) in connected PC joysticks.

  Pin CPC+                    PC                      ________________________
  1   GND (Pot common)        +5V (Pot common)       |                        |
  2   /Fire1                  Player1.Fire1          | 8  7  6  5  4  3  2  1 |
  3   X1                      Player1.PotX (lt/rt)    \ 15 14 13 12 11 10  9 /
  4   /Stick1 (button common) GND (button common)      \____________________/
  5   +5V                     GND
  6   Y1                      Player1.PotY (up/dn)
  7   /Fire2                  Player1.Fire2
  8   GND (Pot common)        +5V (Soundblaster: GND)
  9   GND (Pot common)        +5V
  10  /Fire1                  Player2.Fire 1
  11  X2                      Player2.PotX (lt/rt)
  12  /Stick2 (button common) GND (Soundblaster: Midi TxD)
  13  Y2                      Player2.PotY (up/dn)
  14  /Fire2                  Player2.Fire 2
  15  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 (there are no diodes between pins 7+14 and 2+10 the mainboard).
* The A/D inputs have an input range of 0V (data = 00) to 2.5V (data = 3Fh), and an input impedance of 180kΩ to V<sub>cc</sub>.

==Software using Analog Joystick==

*[[Tennis Cup 2 ( Cartridge )]] allows player 2 to use Analog port.

==Compatible Models ==

*[[Amstrad Analogue Joystick AJ-5]]
*[[Sinclair SPJ-1]]

[[Category:Peripherals]][[Category:CPC Internal Components]][[Category:CPC Plus|*]][[Category:Input Device]]