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Baby AT

The form factor used by most PC motherboards prior to 1998. The original motherboard for the PC-AT measured 12"x13". Baby AT motherboards are a little smaller, 8.5"x13" usually. The Baby AT is being replaced by the new ATX form factor.

Also see From AT to BTX: Motherboard Form Factors  in Webopedia's "Did You Know...?" section.



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