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The PowerBook G4 17-inch computerhas a fiber-optic backlit keyboard and ambientlight sensors that control
the brightness of the display and the keyboard backlighting. In low light, the computer automatically
illuminates the backlit keyboard and lowers the display brightness. As light levels increase, the display
brightness is re-adjusted automatically and the keyboard backlighting is turned off. There are two light
sensors, one under each speaker grill.
Access to internal components and expansion connectors is no longer via the keyboard, so the keyboard is
not latched for removal. Access to the memory cards is via the RAM expansion slot and is explained in “RAM
Expansion Slots” (page 53).
Changing the Operation of the Keyboard
Several of the keys on the keyboard have more than one mode of operation.
● Function keys F1–F10 can also control features such the display brightness, the speaker volume, the dual
display feature, theNum Lock function, and the illuminated keyboard brightness. Refer to Table 3-9 (page
42) for the entire list. A media eject key is located to the right of the F12 function key.
● Certain control keys can be used as page-control keys.
● The keys on the right side of the keyboard can be used as a numeric keypad.
The next sections describe these groups of keys and the way their alternate modes of operation are selected
by using the Fn key, and the Num Lock key.
Keyboard Illustrations
Figure 3-6 (page 39) shows the actual appearance of the keyboard. Figure 3-7 (page 40) shows the alternate
modes of operation of the function and control keys. Figure 3-8 (page 41) shows the embedded numeric
keypad.
Figure 3-6 Keyboard layout
Keyboard 39
Legacy Document | 2003-03-01 | © 2003 Apple Computer, Inc. All Rights Reserved.
CHAPTER 3
Devices and Ports