Apple PC Compatibility Card 7-inch card - Manual (Page 74)

To connect two monitors, follow these steps:
1 Connect the monitor you want to use for the Mac OS environment to the monitor port
(™) or video card port on the back panel of your computer.
WARNING Do not plug a monitor into the joystick port that comes on
some models of the PC Compatibility Card, and do not plug a joystick
into a monitor port (marked with the icon ™). Serious damage can
result to your equipment.
61 Connecting Monitors and Other Equipment