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K Service Source

iBook
iBook/iBook Special Edition
K Service Source

Basics
iBook/iBook Special Edition
Basics Product Overview - 1

Overview

Product Overview
The iBook is designed for
computing on the move. It
features a tough,
polycarbonate body, built-
in handle, lithium-ion
battery that runs up to six
hours between charges, and
support for AirPort
wireless networking.

The iBook is based on the
PowerPC G3
microprocessor and features
Basics Product Overview - 2

a 12.1-inch TFT display.

The iBook Special Edition was introduced in February, 2000
and features an increased processor speed of 366 MHz, a
6 GB hard drive, and 64 MB of RAM.
Basics Service Strategy - 3

Service Strategy
The iBook is serviced exclusively through repair depots
worldwide throughout the life of the product. Carry-in
service to an Apple-authorized service provider is not
available.

Important: Taking the computer apart beyond upgrading RAM
or adding an AirPort Card may void the customer's
warranty.

For more information about Apple's service strategy for
iBook, refer to Program News on Service Source Online and
the Service Source CD.
Basics Warranty/AppleCare Protection Plan - 4

Warranty/AppleCare Protection Plan
The iBook is covered under the Apple One-Year Limited
Warranty. The AppleCare Protection Plan is also available
for this product. Refer to the Service Price Pages for repair
facilitation reimbursement rates.
Basics System Software--NewWorld ROM - 5

New Technologies

System Software--NewWorld ROM
The iBook is the second Macintosh portable to take advantage
of ROM-in-RAM architecture. This design features a small
ROM that provides hardware initialization functions and
provides a mechanism to load the Mac OS ROM image into
RAM. The new software architecture that is centered around
ROM-in-RAM and its ramifications is named NewWorld.

ROM-in-RAM
Hardware-specific code resides in firmware (ROM) that
fits into one ROM called the boot ROM. The boot ROM includes
the code and tables needed to start up the computer, load an
operating system, and provide common hardware access
Basics System Software--NewWorld ROM - 6

services.

All higher-level software resides in what has been
historically known as the Mac OS ROM, but with much of the
old hardware-specific code moved into the boot ROM. As
before, the Mac OS ROM can still be augmented by enablers,
the System file, and extensions.

Prior to the iMac, all Macintosh computers required a ROM
component that contained many components of the Mac OS
software. The NewWorld approach sidesteps this
requirement by copying an image of the Mac OS ROM into
RAM before the Mac OS begins operation. Once the Mac OS
begins operation, a Mac OS ROM image in RAM and an actual
Mac OS ROM behave in the same way. No new or different
software interfaces are directly accessible from the Mac OS.

During the boot process, software contained in the Mac OS
ROM file communicates with Open Firmware to collect
Basics System Software--NewWorld ROM - 7

information about the hardware, using the Open Firmware
Client Interface.

RAM Footprint
Because the Mac OS ROM image is stored in RAM,
approximately 3 MB of RAM is available for other uses. In
effect, a system with 64 MB of RAM appears to have only 61
MB available. Some portion of the missing 3 MB is offset by
having fewer patches in RAM.

Data Structures and Files
The Mac OS ROM image is contained in a new file, named Mac
OS ROM, that resides in the System Folder. The Mac OS ROM
image is exactly the same as it would be if it were an actual
Mac OS ROM, containing the high-level software, the kernel
software, and the 68K emulator.
Basics System Software--NewWorld ROM - 8

Startup Disk Control Panel
Previous systems stored the user's selected startup device
in Parameter RAM (PRAM) when the user selected a device
in the Startup Disk control panel. The startup disk routine
for the iBook, rather than setting Mac OS PRAM, sets an
Open Firmware config variable called boot-device. Open
Firmware honors this setting unless the selected device is
unavailable or is overridden by the user.

The following keys can be pressed to override the selected
startup device: