Game Control Adapter
/ ˈɡeɪm kənˈtroʊl əˈdæptər /
In IBM personal computers and compatibles, a circuit that processes input signals at a game port. Devices such as joysticks and game paddles use potentiometers to represent their positions as varying voltage levels; the Game Control Adapter converts these levels to numbers using an analog-to-digital converter (ADC). See also analog-to-digital converter, game port, potentiometer.