What is DOS and its meaning
DOS - What is a Disk Operating System?
After Bill Gates learned that IBM was looking for an alternative operating system to the originally planned CP / M, he bought the rights to QDOS (Quick and Dirty Operating System) from a small software company. IBM acquired a license from Microsoft and integrated it as PC-DOS 1.0 in the IBM PC.
PC-DOS was based on CP / M and Unix, but the implementation was lacking. It turned out to be a rather poorly programmed operating system, so Microsoft completely reprogrammed the operating system. With PC-DOS 2.0, the first adequately functioning operating system came onto the market.
Since IBM did not license the operating system exclusively, Microsoft was also able to sell the operating system to other companies. Under the name of MS-DOS so came about one of the most popular operating systems at that time. As early as 1982, more than 50 companies had a license agreement for Microsoft's Disk Operating System.
Over time, the users of the Disk Operating System began to want a graphical user interface. Microsoft fulfilled this wish in 1985 with Windows 1.0, in which it imitated the GUI developed by XEROX in the 1970s. Apple also brought this GUI to the public. Users no longer had to laboriously open programs with a keyboard command, but could simply click on an icon with the mouse.
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