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expansion bus[ik′span·shən ‚bəs]
The wiring and protocols that connect a computer's motherboard with the peripheral devices.
expansion busAn input/output pathway from the CPU to peripheral devices. An expansion bus typically comprises a series of slots on the motherboard into which cards are inserted. PCI and PCI Express are common expansion buses in computers. See PCI, PCI Express, expansion card and PC data buses. See also bus extender.