Early source code from MS-DOS and Word for Windows is now part of the Computer History Museum, Microsoft announced earlier this week as part of an ongoing project "to help future generations of engineers better understand the roots of personal computing."
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 Kevin Stratvert | 2023-05-29 07:00:05 |  3,132,640 Views |
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Software companies always keep the source code secret, but Microsoft is the first to make MS-DOS 1.1 and 2.0 and Word for Windows 1.1a available to the public under a non-commercial license that restricts the release of the software.
Back then (1980s), Microsoft provided IBM with the BASIC language interpreter, then Microsoft started working on a project codenamed "Chess", but later IBM needed an operating system and asked Microsoft to provide the solution. The software giant produced two versions: PC-DOS, the Personal Computer Disc Operating System, which was licensed to IBM, and MS-DOS, another variant of the operating system developed for other PC outlets.
It should be noted that Microsoft did not create the operating system entirely, but the company used an operating system licensed from Seattle Computer Products as the basis for DOS.
