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PATH Hardware Documentation
> PowerBook G3 Series 1999
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The Mac OS ROM image is contained in a new file, named "Mac OS ROM", that is kept 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.
The Startup Disk control panel sets the Open Firmware's boot-device configuration variable by modifying the Open Firmware NV-RAM partition that contains the Open Firmware's configuration variables. The format of the NV-RAM partition is defined in the Open Firmware CHRP Binding. The partition is accessed using RTAS.
