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CP/M (Control Program for Microcomputers[3]) was a mass-market operating system created for Intel 8080/85 based microcomputers by Gary Kildall of Digital Research, Inc. The Digital Research sold version supported the Intel 8080 Development System. Author Sir Harold Evans wrote that Microsoft DOS inventor Tim Paterson relied heavily on an existing OS called CP/M (Control Program/Monitor) created by programmer Gary Kildall, supporting the claim that Microsoft's First OS Was Stolen. Microsoft used DOS to make billions in sales and pave the way for the Windows operating system. Without CP/M there would have been no DOS (Disk Operating System) and likely leaving Microsoft as only a briefly existing company in the footnotes of the personal computer. Bill Gates likely owes everything to the tragic creator of CP/M, Gary Kildall.== CP/M for the Microcomputer ==