Microsoft releases MS-DOS 4.0 source code and floppy images through an open-source license
Ten years after releasing the source code of MS-DOS 1.25 and 2.0, Microsoft is making yet another contribution to the world of open-source software preservation. Working in partnership with IBM and “in the spirit of open innovation,” the company has released the source code of MS-DOS 4.00 under an MIT license.
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Source : https://www.techspot.com/news/102752-microsoft-releases-ms-dos-40-source-code-floppy.html