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Microsoft Just Released MS-DOS Source Code!
(github.com)
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In 2014, MS-DOS 1.25 and 2.0 were released under a Microsoft shared-source license (Microsoft Research License) which forbids redistribution
In 2018, both versions were published to GitHub and relicensed as MIT, making them properly open-source
Today, MS-DOS 4.00 was added to that repo, also under MIT.