Reads the value (or resistance across) the game port channel specified by
mask input must be either 1, 2, 4, or 8.
mask is 1, then INGAMEPORT reads the x-axis.
mask is 1, then INGAMEPORT reads the y-axis.
You can read the button states using
INGAMEPORT outputs -1 if nothing is connected to the game port.
REPEAT 10000 [SHOW INGAMEPORT 1]
Now move the Joystick around.