Developer Documentation
PATHHardware Documentation > PowerBook G3 Series 1999

System Software

The PowerBook G3 Series 1999 computer is different from previous PowerBook computers in that it has no single, large ROM that contains many components of the Mac OS software, along with the 68K emulator, hardware initialization, and the nanokernel. Instead, a small ROM 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 called the NewWorld architecture.

The New Approach

Boot ROM Contents

Mac OS ROM Image File Contents

NewWorld Boot Process

What Is Different


© 1999 Apple Computer, Inc. – (Last Updated 29 April 99)