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PATH Hardware Documentation
> PowerBook G3 Series 1999
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Certain hardware devices differ from machine to machine, but provide similar functions. RTAS ( Run-time Abstraction Services) provides such hardware-specific functions, including functions for accessing the real-time clock, nonvolatile RAM (NV-RAM), restart, shutdown, and PCI configuration cycles. The I/O primitives for these functions in the Mac OS ROM Image for NewWorld use RTAS.
