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Baby AT Last modified: Thursday, July 14, 2005

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.

Motherboard form factors Describes the various form factors for PC motherboards, with separate sections on the Baby-AT, ATX, and LPX form factors. This page is from "The PC Guide". System Case Form Factors Describes the different form factors used for PC cases, with special attention to the "Baby AT" and ATX form factors. This page is part of "The PC Guide". Webopedia Did You Know - From AT to BTX: Motherboard Form Factors You'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?