IBM PC/XT (I-B-M` P-C X-T') noun

A class of personal computer released by IBM in 1983. XT, short for eXtended Technology, enabled users to add a wider range of peripherals to their machines than was possible with the original IBM PC. Equipped with a 10-megabyte hard disk drive and one or two 5-inch floppy drives, the PC/XT was expandable to 256K of RAM on the motherboard and was loaded with MS-DOS v2.1, which supported directories and subdirectories. The popularity of this machine contributed to the production of what came to be known in the industry as "clones," copies of its design by many manufacturers. See also IBM AT, IBM PC. Also called XT.