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To achieve maximum compatibility with PCI-compliant devices and plug-in cards, the current line of Power Macintosh computers are designed to comply with the PCI Local Bus Specification, Revision 2.1. This support includes, as a minimum, the following general areas:
As explained in Address Allocations, a Power Macintosh computer may contain as many as four separate PCI buses for expansion cards, although initial models contain fewer than four.
The next sections contain clarifications and interpretations of the PCI specification that more fully specify the Macintosh implementation of PCI for expansion cards.