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Assuming that we are only talking about the personal computer (PC) market, before Microsoft's Windows operating systems, Microsoft's Disk operating system, or DOS, was used. Before that, CP/M was a popular computer operating system.

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Q: What computer system was used before Microsoft was invented?
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XP is the abbreviation assigned to a computer operating system designed by Microsoft that is now outdated.


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The term you want is PC: personal computer. This architecture implies operation under the Disk Operating System -- DOS, written by Microsoft. Many other vendors now manufacture PCs that all operate under a Microsoft operating system. In addition, the Linux operating system can operate a PC.

Related questions

When did the XP computers invented?

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