Commodore VIC-20 User Manual page 172

158
The VIC 20 User Guide
THE JOYSTICK CONTROLLER
The joystick, like old-fashioned airplane control sticks, controls both
up-and-down and side-to-side motion. It does so with four switches: Up,
Down, Left, and Right. Inside the joystick are "fingers" that push these
switches as the stick is moved.
If the stick is moved up, down, or to one side, only one switch is closed.
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