("Advanced Technology") A version of the IBM PC, released in Aug 1984 wITh an Intel 80286 processor, a 16-bITbus, a medium-speed hard disk and a 1.2 megabytefloppydisk drive. IT had a larger case than the PC, which allowed IT to accept "tall cards". The AT keyboard corrected the PC' s non-standard placement of the return and left shift keys but shortened the backspace key, making IT harder to reach. (1995-03-01)