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| List of Microsoft DOS versions ： ウィキペディア英語版 |
Comparison of DOS operating systems
This article details various versions of DOS-compatible operating systems.
== Historical and licensing information ==
Originally MS-DOS was designed to be an operating system that could run on ''any'' computer with a 8086-family microprocessor. It competed with other operating systems written for such computers, such as CP/M-86 and UCSD Pascal. 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. So there were many different original equipment manufacturer (OEM) versions of ''MS-DOS'' for different hardware. But the greater speed attainable by direct control of hardware was of particular importance, especially when running computer games. 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. 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. One version of such a ''generic MS-DOS'' (Z-DOS) is mentioned here, but there were dozens more. All these were for personal computers that used an 8086-family microprocessor, but which were not IBM PC compatible.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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