User`s manual

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Hardware Installation
2.6.11 Game/MIDI Port
The Game/MIDI port is identical to that of a standard PC game
adapter or game I/O port. Connect an analog joystick to the 15-pin
D-sub connector (J7 - Gold) located at the ATX double deck ports
of the mainboard. This port works well with any application that is
compatible with the standard PC joystick.
Game/MIDI Port