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CP/M (Control Program for Microcomputers) 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. CP/M was the first operating system for microcomputers.CP/M (Control Program for Microcomputers) was a mass-market operating system created for Intel 8080/85 based microcomputers by Gary Kildall of Digital Research, Inc. Digital Research sold a version that supported the Intel 8080 Development System. CP/M was the first operating system for microcomputers.Author Sir Harold Evans wrote that Microsoft DOS inventor Tim Paterson relied heavily on an existing OS called CP/M 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. Author Sir Harold Evans wrote that Microsoft DOS inventor Tim Paterson relied heavily on an existing OS called CP/M 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.