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Mac OS ROM Image File

The Mac OS ROM image file (also called the bootinfo file) is named Mac OS ROM. It includes:

• A Mac OS Loader program

• A compressed Mac OS ROM image including:
  • 68K code Macintosh Toolbox code and data resources

  • PowerPC shared libraries

  • Nanokernel, the Mac OS 9 kernel

  • 68LC040 Emulator

  • drivers and libraries needed during OS boot

The Nanokernel and the 68LC040 Emulator are low-level Mac OS initialization components that were part of BootPowerPC code in previous CPU ROMs. They are now included in the Mac OS ROM Image.

Complementarily, CPU-specific hardware initialization code has been relocated into the boot ROM as described in the previous section.