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Connector pinout: TI-99/4A Joystick Port TI-99/4A Joystick Port 9 PIN D-SUB MALE at the computer. 9 PIN D-SUB FEMALE at the joystick cable. pin name direction description color 1 N.C. - N.C. 2 Test joystick 2 OUT Test joystick 2 3 UP IN UP 4 Fire button pressed IN Fire button pressed 5 Left IN Left 6 N.C. - N.C. 7 Test joystick OUT Test joystick 8 Down IN Down 9 Right IN Right