== Use with the Amstrad Plus ==
When used with the Amstrad plus, the button labelled "I" activates joystick fire 2(giving 'Z' in BASIC), and the button labelled "II" activates joystick fire 1(giving 'X' in BASIC), therefore the fire buttons are mapped to the digital joystick 0 fire buttons.
When the sliders are in the middle, the values returned from both axes change rapidly between &1c and &1b, but this changes depending on the exact position of the slider (the fact remains the values change rapidly).