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Expansion Bus Manager

This chapter describes a number of services for PCI cards, collectively called the Expansion Bus Manager, that are included in the firmware and system software in the second generation of Power Macintosh computers. It is divided into the following major sections:

• Expansion ROM Contents summarizes the attributes of a Macintosh compatible PCI card.
• Nonvolatile RAM, illustrates how nonvolatile RAM is allocated in a typical Power Macintosh computer.
• PCI Nonmemory Space Cycle Generation, lists routines that you can use to access memory in the various PCI address spaces.
• Card Power Controls, describes calls that Mac OS uses to control PCI card power levels.