Computer Hardware Terms, Glossary and Dictionary

AT bus

AT bus, also known as ISA (Industry Standard Architecture) bus, is a 16-bit bus started with the IBM-AT (Advanced Technology) systems. It is still the standard interface for most PC expansion cards. The bus is the collection of wires and electronic components that connect all device controllers and add-in cards. The controllers are the components that attach to peripheral devices. The bus, therefore, is the main highway for all data moving in and out of the computer.

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AT bus