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First released on August 12, 1981, MS-DOS became the foundation for business computing for almost two decades. This article details different versions and releases that all stemmed from Gary Kildall's QDOS.
Before Microsoft and Intel dominated the PC market with a common platform, the CP/M operating system did something similar for small business machines in the late 1970s and early 1980s—until MS-DOS pulled the rug out from under it. Here’s more about CP/M, and why it lost out to MS-DOS.