The Personal System/2 or PS/2 was IBM's third generation of personal computers released in 1987. It officially replaced the IBM PC, XT, AT, and PC Convertible in IBM's lineup. The PS/2 line was created by IBM in an attempt to recapture control of the PC market by introducing an advanced yet proprietary architecture. IBM's considerable market presence plus the reliability of the PS/2 ensured that the systems would sell in relatively large numbers, especially to large businesses.