Logic board
Encyclopedia
A logic board is the Apple equivalent of a motherboard
Motherboard
In personal computers, a motherboard is the central printed circuit board in many modern computers and holds many of the crucial components of the system, providing connectors for other peripherals. The motherboard is sometimes alternatively known as the mainboard, system board, or, on Apple...

. 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 logic board replaced with the new one, along with other upgrades necessary to bring their computer in line with the new model's specs. The old logic board would be kept by the dealer as a trade in.
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