Apple PC Compatibility Card - Manual (Page 117)

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You can use a single monitor to switch between the PC environment and the
Mac OS environment. Or you can simultaneously display both environments
on two monitors.
To learn how to connect your monitors, first read about using the loopback
cable on the next page. Then turn to the section on connecting a single monitor
or the section on connecting two monitors. Follow the instructions for your
model of Macintosh computer. If you have an AudioVision or AppleVision
monitor, turn to the section with additional instructions for these monitors.
After you’ve connected your monitor, read the end of this chapter to find out
how to connect other equipment.
Connecting Monitors and Other Equipment
5