Apple PowerBook (2400c) - Manual (Page 56)

m When an external monitor offers the same resolution as the PowerBook’s
display (800 x 600 pixels at 60 hertz [Hz] refresh rate), the image appears
on both screens the first time you turn on the computer if the PowerBook’s
display is open.
m The PowerBook is designed to be “plug-and-play” when an external
monitor is attached. The computer’s hardware checks to determine the
appropriate choice of resolutions for the connected monitor and provides
the highest resolution possible in response to the information it receives. If
the computer cannot determine the external monitor’s capabilities, it
displays images in the common VGA format (640 x 480 pixels at 60 Hz
refresh rate).
m If the PowerBook starts up with the display closed (called “docking mode”)
and an external monitor is attached, the PowerBook’s display does not turn
on and the display’s resolution (800 x 600) is not listed in the resolution
section of the Control Strip.
For complete instructions on adjusting the resolution for an external monitor,
see the “Monitors” topic area of Mac OS Guide.
The list below shows a sampling of the external monitors and resolutions
supported by your PowerBook. Many other monitors are also supported.
Monitor type Resolution Bits per pixel †
Apple 20-inch multiple scan 832 x 624 4, 8
Apple 20-inch multiple scan 1024 x 768 4, 8
NTSC TV monitor 512 x 384* 4, 8, 16
NTSC TV monitor 640 x 480 4, 8, 16
PAL TV monitor 640 x 480* 16
PAL TV monitor 1024 x 768 4, 8, 16
*An asterisk indicates the startup resolution. Other resolutions can be selected using the Control Strip.
† Bits per pixel indicate the number of colors a monitor can display at a given resolution.
For example, 4 bits = 16 colors; 8 bits = 256 colors; and 16 bits = thousands of colors.
56 Chapter 3