Napravljen 1984. godine, bio je to prvi IBM-ov računar koji je koristio procesor 80286. AT znači napredna tehnologija.
A class of personal computers introduced in 1984 and conforming to IBM’s PC/AT (Advanced Technology) specification. The first AT was based on the Intel 80286 processor and dramatically outperformed its predecessor, the XT, in speed. See also 80286.