A smaller version of the original AT motherboard used in the IBM PC/AT. Introduced in 1987, the Baby AT reduced width from 12" to 8.5". Although its maximum length was 13", most boards were only 9 ...
(Advanced Technology EXtended motherboard) The PC motherboard that superseded the Baby AT design. The ATX layout rotated the CPU and memory 90 degrees, allowing full-length expansions to be ...