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Microsoft releases MS-DOS 4 source code on GitHub — 45 year old code now open-source

https://www.tomshardware.com/software/operating-systems/microsoft-releases-ms-dos-4-source-code-on-github-45-year-old-code-now-open-source

MS-DOS 4.00 code, binaries, disk images, and documentation now available.

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IonicFrog

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I wonder if they licensed the source of 5.0+ to someone and are still getting paid for it. If so, it's probably something ubiquitous and critical that nobody would think of like traffic lights or water treatment plants.

CatTrickery

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I think that is likely since 3.3 wasn't included either and that is one of those versions people stuck with for ages.