MS-DOS (and the IBM PC-DOS which was licensed therefrom), and its predecessor, 86-dos, was inspired by CP/M (Control Program / (for) Microcomputers) — which was the dominant disk operating system for 8-bit Intel 8080 and Zilog Z80 based microcomputers. Tim Paterson at Seattle Computer Products developed a variant of CP/M-80, intended as an internal product for testing the SCP's new 8086 CPU card for the S-100 bus. It did not run on the 8080 CPU needed for CP/M-80. The system was named 86-DOS (it had initially been called QDOS, which stood for Quick and Dirty Operating System).
A full time operating system was needed for IBM's 8086 line of computers, but negotiations for the use of CP/M on these broke down. IBM approached Microsoft's CEO, Bill Gates, who purchased QDOS from SCP allegedly for $50,000. This became Microsoft Disk Operating System, MS-DOS. Microsoft also licensed their system to multiple computer companies, who used their own names. Eventually, Microsoft would require the use of the MS -DOS name, with the exception of the IBM variant, which would continue to be developed concurrently and sold as PC-DOS (this was for IBM's new 'PC' using the 8088 CPU (internally the same as the 8086)).[1]
A full time operating system was needed for IBM's 8086 line of computers, but negotiations for the use of CP/M on these broke down. IBM approached Microsoft's CEO, Bill Gates, who purchased QDOS from SCP allegedly for $50,000. This became Microsoft Disk Operating System, MS-DOS. Microsoft also licensed their system to multiple computer companies, who used their own names. Eventually, Microsoft would require the use of the MS -DOS name, with the exception of the IBM variant, which would continue to be developed concurrently and sold as PC-DOS (this was for IBM's new 'PC' using the 8088 CPU (internally the same as the 8086)).[1]
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