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Differences Introduced by the NewWorld Architecture

From a user and application developer point of view, the NewWorld architecture is implemented to be as compatible as possible with previous Macintosh system architectures. However, there are differences that developers, particularly developers interested in participating in the boot process, should be aware of. The information in the following sections briefly describes the key differences. The boot process is defined in NewWorld Boot Process, and in Startup Sequence in the NewWorld Architecture.

Boot Devices

RAM

Hardware Addresses

Macintosh Name Registry

The gestaltMachineType Value

Interrupt Handling

ROM-in-RAM

Runtime Abstraction Services (RTAS)

NVRAM and PRAM

USB

ADB

Floppy Drives

Video Drivers


© 1999 Apple Computer, Inc. – (Last Updated 26 March 99)