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PATH Hardware Documentation
> iBook Developer Note
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The system software for the iBook supports several other new features.
The I 2 S-based sound system in the iBook is the first such implementation on any Macintosh computer. To support this new hardware, a Sound HAL (hardware abstraction layer) has been written. In addition to the HAL, a port handler has been written to describe the hardware capabilities.
The built-in keyboard has several new features. Several of the keys on the keyboard have more than one mode of operation. The function keys can also control the display and speakers; the keys on the right side of the keyboard can also be used as a numeric keypad; and certain control keys can also be used as page-control keys. The Keyboard Control Panel has been changed to support these new features, as described in the section Keyboard .
External keyboards connected using USB will work. The image displayed by Key Caps toggles when input from a new keyboard is detected.
The iBook uses on-screen display meters for its sound and display control buttons. There are separate on-screen display meters for display brightness, sound volume, and mute.
A software driver for the AirPort Card wireless LAN module is included in the Extensions folder. For more information, please see Software Components .