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What Is Different

Even though ROM-in-RAM involves a fundamental change to the construction of the product-specific part of the Mac OS, the changes in the code and its execution are not that large. Many components are in changed locations, but their functions with respect to boot time and run time have not greatly changed. Many Mac OS components remain untouched.

Outmoded Resources

RAM Footprint

RTAS

NV-RAM

NanoKernel

Startup Disk Control Panel

Open Firmware and the Device Tree

Open Firmware and Startup Devices

Interrupt Layout

Machine Identification