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Definition: PC bus

(1) The data pathway between the CPU and peripherals in a PC. See PC data buses.

(2) The official name of the 8-bit bus architecture used in first-generation IBM PCs and XTs. The PC bus was superseded by the 16-bit AT bus, later known as ISA, which also accepted 8-bit PC bus cards. See ISA bus and PC data buses.

The PC Bus
These are the five PC bus slots in IBM's prototype motherboard. The IBM PC set the standard for personal computing for decades. See motherboard. (Image courtesy of IBM.)