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From The Free On-line Dictionary of Computing (27 SEP 03) : [ foldoc ]
IBM PC AT
("Advanced Technology") 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 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)