In 1992, Macworld stated that "IBM lost control of its own market and became a minor player with its own technology." Most major PC manufacturers balked at IBM's licensing terms for MCA-compatible hardware, particularly the per-machine royalties. This was only 18 months after the new range had been introduced. However IBM's initial PS/2 computers were popular with target market corporate buyers, and by September 1988 IBM reported that it had sold 3 million PS/2 machines. These models were in the strange position of being incompatible with the IBM-compatible hardware standards previously established by IBM and adopted in the PC industry. The PS/2 line was created by IBM partly in an attempt to recapture control of the PC market by introducing the advanced yet proprietary Micro Channel architecture (MCA) on higher-end models. Many of the PS/2's innovations, such as the 16550 UART (serial port), 1440 KB 3.5-inch floppy disk format, Model M keyboard layout, 72-pin SIMMs, the PS/2 port, and the VGA video standard, went on to become standards in the broader PC market.
Released in 1987, it officially replaced the IBM PC, XT, AT, and PC Convertible in IBM's lineup. The Personal System/2 or PS/2 is IBM's third generation of personal computers.
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