Apple PC Compatibility Card (Installation) - Manual (Page 77)

3 Plug the connector on the short end of the cable into the cable for the monitor that you
want to use with the PC environment.
Leave the long connector on the loopback cable unplugged.
Connecting a PC game controller
Some models of the PC Compatibility Card come with a joystick port. To
connect a PC game controller, such as a joystick, remove the plastic cover on
the joystick port; then plug your game controller into the port.
WARNING Do not plug a monitor into the joystick port, and do not plug a
joystick into a monitor port (marked with the icon ™). Serious damage
can result to your equipment.
The joystick port is marked with the icon. Remove the port cover
before plugging a game controller into the joystick port. Leave the
port cover on if you are not going to attach a game controller.
Game controller
Plug the game controller
into the joystick port.
Attach the short
connector on the
loopback cable
to the second
monitor’s cable.
Long connector
77 Installing the PC Compatibility Card in a Modular Desktop Macintosh Computer