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Industry Standard Architecture

Industry Standard Architecture The architecture developed by IBM and opened up for use by other manufacturers. Renamed ISA, it became the de facto architecture for personal computers for many years. It was introduced by IBM in the 8-bit IBM PC/XT and expanded when the 16-bit PC/AT was introduced. It allows add-in cards to be plugged into standard expansion slots. A 16-bit ISA slot comprises two separate 8-bit slots. See also EISA, MCA, local bus architecture.

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