Interpreter Functions for the analog joystick

Some of the programmable terminals have an onboard analog joystick on the front panel.

The following interpreter function can be used to poll the joystick in your application:

jx : joystick x-position, "calibrated": Returns the horizontal position of the joystick as a "raw" value from the analog/digital conterter.
Value range: -100=max. LEFT, 0=center, +100=max. RIGHT .
jy : joystick y-position, "calibrated": Returns the vertical position of the joystick as a "raw" value from the analog/digital conterter.
Value range: -100=max. DOWN, 0=center, +100=max. UP.
jxr : joystick x-position, "raw": Returns the horizontal position of the joystick as a "raw" value from the analog/digital conterter.
Value range: + / - 512
Center position: 0 (+/- mechanic and electronic tolerances); LEFT=negative, RIGHT=positive .
jyr : joystick y-position, "raw": Returns the vertical position of the joystick as a "raw" value from the analog/digital conterter.
Value range: + / - 512
Center position: 0 (+/- mechanic and electronic tolerances); DOWN=negative, UP=positive.

jc : joystick cursor emulation mode: If this flag is set (which is the default state), the analog joystick acts as a replacement for the cursor keys.
The flag is set automatically when entering the terminal's system menu, because without cursor keys you cannot navigate through that menu (and the first device with such a joystick didn't have any "real" cursor key. Note: Pressing the joystick button places code #13 (=RETURN or ENTER) in the keyboard buffer, because the keyboard of the first terminal with a joystick didn't have an enter key as well ;-)