The IBM Personal Computer, commonly known as the IBM PC, is the original version and progenitor of the IBM PC compatible hardware platform. It is IBM model number 5150, and was introduced on August 12, 1981. It had a 4.77 MHz Intel 8088 microprocessor and used MS-DOS, with monochrome phosphor monitor and IBM PC keyboard. International Business Machines (IBM), one of the world's largest companies, had a 62% share of the mainframe computer market in 1981.

 

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