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An IBM PC compatible computer, a short-hand way of designating, especially during the period 1981–1997, a computer generally similar to the original IBM PC, XT and AT. Such computers used to be referred to as PC clones, since they almost exactly duplicated all the significant features of the PC, XT or AT internal design. IBM-compatible is a historical term since IBM no longer manufactures personal computers. Pragmatically, the operational definition of "compatible" is now "capable of running the current edition of Microsoft Windows", while the term PC has largely supplanted IBM compatible for computers in this line of descent.