Board for switching joystick ports. Since games ask for the first or second port of the joystick, it has to be thrown from one connector to another. As they say, this is the main reason for the failure of the CIA + inconvenience. It turns out that the joystick switches the toggle switch to the desired port + some CIA protection, since the connector is now not hanging directly on it, but buffered through this controller. There are no programmable microcircuits on the board.