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Microsoft releases MS-DOS 4 source code on GitHub — 45 year old code now open-source (www.tomshardware.com)

submitted 4 months ago by [email protected] to c/[email protected]

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[–] [email protected] 23 points 4 months ago (2 children)

But not 5.0 yet - they still got critical proprietary stuff in EDIT and SMARTDRV.SYS that they don’t want their competitors to get a hold of.

[–] [email protected] 12 points 4 months ago (1 children)

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.

[–] [email protected] 7 points 4 months ago

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

[–] [email protected] 4 points 4 months ago

According to people who are way more interested in this than I am, there was a bunch of licensed software in 5 and 6.