baby at

from The Free On-line Dictionary of Computing (8 July 2008)

Baby AT

   <hardware> The redesigned {AT} motherboard that had the same
   size as the {XT} motherboard had (8.5" x 11") and could thus
   fit into an XT case.  The original 12" x 13" AT motherboards
   are now largely forgotten.

   Compare {ATX}.

   (1997-02-20)