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Logic board

 

A printed circuit board that contains logic circuits. Apple calls the motherboard in its Macintoshes the main logic board. See logic circuit and logic gate.

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Wikipedia: 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 1980s, when the compact Macs at the time had two separate circuit components. The term logic board stuck over the years of Macintosh manufacturing, even in the non-all-in-one Macs. A longtime practice for Apple when an existing model was upgraded was to offer a logic board upgrade where a user could bring their computer into an Apple dealer and have the old motherboard replaced with the new one, along with other upgrades necessary to bring their computer in line with the new model's specs. The old motherboard would be kept by the dealer as a trade in.

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