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Definition: IBM AT

(Advanced Technology) IBM's first 286-based PC. Introduced in 1984, three years after the first IBM PC, the PC/AT featured a new keyboard, a higher-capacity 5.25" floppy (1.2MB) and a 16-bit data bus. Users were thrilled with the storage capacity of its "huge" 20MB hard drive. AT-class machines ran considerably faster than the first 8088-based XT PCs. See 286 and AT bus.

The fastest PC in 1984. Users were amazed at the extraordinary speed of the 286 with its huge 20MB hard disk. (Image courtesy of IBM.)