<computer> A version of the IBM PC released in Aug 1984 with an Intel 80286 processor, a 16 bit bus, a medium-speed hard disk and a 1.2 megabyte floppy disk drive. It had a large case than the PC, which allowed it to accept "tall cards".
The AT fixed the PC's non-standard placement of the return and left shift keys but shortened the backspace key, making it harder to reach.
(01 Mar 1995)