Microsoft needed an operating system for the then-new Intel 8086 but it had none available, so it bought 86-DOS for $75,000 and licensed it as its own then released a version of it as MS-DOS 1.0. MS-DOS was a renamed form of 86-DOS – informally known as the Quick-and-Dirty Operating System or Q-DOS – owned by Seattle Computer Products, written by Tim Paterson. It was also the underlying basic operating system on which early versions of Windows ran as a GUI. Ultimately it was the key product in Microsoft's growth from a programming languages company to a diverse software development firm, providing the company with essential revenue and marketing resources. MS-DOS itself would go through eight versions, until development ceased in 2000. Although MS-DOS and PC DOS were initially developed in parallel by Microsoft and IBM, the two products diverged after twelve years, in 1993, with recognizable differences in compatibility, syntax, and capabilities.ĭuring its life, several competing products were released for the x86 platform, such as DR-DOS and Z-DOS. IBM licensed and re-released it in 1981 as PC DOS 1.0 for use in its PCs. It was the most used member of the DOS family of operating systems, and was the main operating system for IBM PC compatibles during the 1980s, from which point it was gradually superseded by operating systems offering a graphical user interface (GUI), in particular by generations of the Microsoft Windows operating system. MS-DOS (an acronym for Microsoft Disk Operating System, also known as Microsoft DOS) is an operating system for x86-based personal computers mostly developed by Microsoft.
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