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Related to expansion bus: expansion slot
, PCI bus
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, typically comprising a series of slots on the motherboard into which expansion cards are inserted. PCI is a common expansion bus in a PC and other hardware platforms. See expansion card and PC data buses. See also bus extender.