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Today, the term is used more generally to refer to any PC with an 80286 processor.
Also see From AT to BTX: Motherboard Form Factors in Webopedia's "Did You Know...?" section.
(2) See @ sign.
(3) Short for assistive technology.
Webopedia Did You Know - From AT to BTX: Motherboard Form FactorsYou've probably heard the term motherboard a thousand times, but do you know what it really means and how it relates to the rest of your computer?