A 101-key keyboard (U.S. layout) from IBM that superseded the PC/XT and AT keyboards. Introduced in 1985 as the Model M and standard on IBM's PS/2 computer, the Enhanced keyboard was used for more than a decade and continues to be used in its Windows keyboard variant. The Enhanced keyboard relocated the Control, Alt and function keys, and many fast typists were extremely unhappy about the changes. In 1995, the Enhanced layout was superseded by the Windows keyboard, which uses the same layout plus three specialized Windows keys (see Windows keyboard). See PC keyboard.