The Personal System/2 or PS/2 is IBM's second generation of personalcomputers. Released in 1987, it officially replaced the IBM PC, XT, AT, and PC Convertible
the IBM PC: IBM 5100 (1975) IBM 5110 (1978) IBM 5120 (1980) IBM System/23 Datamaster (1981) Japan-only IBM PC variants: IBM 5550 IBM JX IBMPS/55 IBM Palm