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PATH Hardware Documentation
> PowerBook G3 Series 1999
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The computer comes with a monitor adapter that allows the user to connect a standard Apple monitor cable to the computer. The Apple part number for the adapter is 590-1118.
To identify the type of monitor connected, the computer first determines whether the adapter is connected. It does this by checking pin 11; on the adapter, this pin is connected to the VSYNC signal. If the adapter is not found, the computer next checks to determine whether a DDC-type monitor is connected. DDC is the interface that provides monitor ID signals for VGA and SVGA monitors.
If the computer does not detect a DDC-capable monitor, it uses the Apple monitor sense codes on the signals MONID(0-2) in Table 3-11 . For a description of the sense code system, developers should refer to Technote HW 30 - Sense Lines. To find out how to obtain Apple Computer's Technotes, see Related Information .
Note
The first time the user starts up with an SVGA or XGA monitor, the video card treats it as a VGA monitor and shows a 640-by-480 pixel display. The user can switch to a larger display mode from the Monitors & Sound control panel; when that happens, the computer changes the display to the larger mode immediately and uses that mode the next time it is started up.
