Apple PowerBook G3 - Manual (Page 63)

Connecting Additional Equipment 63
Using an External Monitor
You can connect an external monitor to your Macintosh PowerBook. The types of monitors
you can use with this model and the way images are displayed on an external monitor differ
somewhat from the features available with other PowerBook computers.
To make the best choice of an external monitor, keep the following in mind:
m Your PowerBook can support a variety of external monitors, including 17-inch and 20-inch
multiple-scan displays.
m Your PowerBook display must be open when you use an external monitor because heat
from the PowerBook is partially dissipated through the keyboard. Closing the display will
cause the PowerBook to go to sleep. Macintosh PowerBook G3 Series computers do not
work with the display closed.
m The computer’s back panel has a VGA-style connector. You can connect the cable for a
VGA-style monitor directly to your PowerBook.
m To connect an Apple-compatible monitor to your PowerBook, you must use the video
adapter that came with the computer.
m Images can appear on the internal display, the external monitor, or both, depending on
your choice of resolution on the external monitor.
m When an image appears on both screens, it is exactly the same (this feature is known as
“simulscan” or “video mirroring”). You cannot move the pointer or menu bar from one
screen to the other (as you can when a second display is connected to most Macintosh
desktop computers).
m When an external monitor offers the same resolution as the PowerBook’s internal display,
the image appears on both screens the first time you turn on the computer.
m If a multiple-resolution external monitor provides a list of its capabilities, the list appears
in the Control Strip. Otherwise the system uses a resolution of 640 x 480 pixels as the
default for that monitor.
For more information on adjusting the resolution of an external monitor, see the online
help, available in the Help menu.
Important Video mirroring works only with the PowerBook display’s standard resolution.
For example, when the 12.1" display is set to its standard resolution (800 x 600) or the
14.1" display is set to its standard resolution (1024 x 768), the display can mirror the
external monitor. However, if you switch the resolution to 640 x 480, the built-in display
will go dark because scaled resolutions cannot be used for video mirroring.