An early I/O connector that is used to attach a joystick or other video game controller. The legacy game port on a PC is a 15-pin socket; however, this dedicated connector was replaced with USB.
Those signals are processed and sent to a parallel port joystick emulator, enabling him to use the wheel with any game supporting a standard joystick. Obviously he could have just gone out to the ...
Being able to retroactively make a current game work on older systems is just yet another reminder that video game development is like a magic spell sometimes.