Logic board

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A logic board is the Apple Macintosh equivalent of a motherboard. The term "logic board" was coined back in the Eighties, when the compact Macs at the time had two separate circuit boards, the Logic Board, containing all of the computer's "logic" circuitry (processor, RAM, etc.), and the analog board, containing all of the hardware necessary to drive the built-in display and to power the rest of the computer's components. The term "logic board" stuck over the years of Macintosh manufacturing, even in the non-all-in-one Macs.