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 8.0 (Windows Me and later Windows versions) ġ60 KB 180 KB 320 KB 360 KB 1.2 MB, 1.54 MB (XDF)ģ15 KB 720 KB CP/M 315 KB CP/M 720 KB MSX-DOS 360 KB MSX-DOS 720 KBġ60 KB 180 KB 320 KB 360 KB 800 KB 1.2 MB CP/M 160 KB CP/M 320 KBġ60 KB 180 KB 320 KB 360 KB 1.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. MS-DOS 7.1 (Windows 95B/OSR2, Windows 95C/OSR2.5, Windows 98, and Windows 98SE)ĭriveSpace for Windows 95, none for Windows 98 MS-DOS 7.10 (Windows 95 OSRs 2 and 2.5, 98, 98 SE)Ī derivative, Enhanced DR-DOS, is maintained by Udo KuhntĬromemco/Tarbell 250.25 KB Tarbell 616 KB Tarbell 1232 KB ġ6 MB (32 MB with third-party FORMAT) Ģ50.25 KB 500.5 KB 616 KB 1232 KB

MS-DOS 1.25 (first version named 'MS-DOS') All these were for personal computers that used an 8086-family microprocessor, but which were not fully IBM PC compatible. One version of such a generic MS-DOS (Z-DOS) is mentioned here, but there were dozens more. This specific version of MS-DOS is the version that is discussed here, as all other versions of MS-DOS died out with their respective systems. So very soon an IBM-compatible architecture became the goal, and before long all 8086-family computers closely emulated IBM hardware, and only a single version of MS-DOS for a fixed hardware platform was all that was needed for the market. But the greater speed attainable by direct control of hardware was of particular importance, especially when running computer games. So there were many different original equipment manufacturer (OEM) versions of MS-DOS for different hardware. Each computer would have its own distinct hardware and its own version of MS-DOS, a situation similar to the one that existed for CP/M, with MS-DOS emulating the same solution as CP/M to adapt for different hardware platforms. It competed with other operating systems written for such computers, such as CP/M-86 and UCSD Pascal. Originally MS-DOS was designed to be an operating system that could run on any computer with a 8086-familymicroprocessor.

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