Microsoft releases MS-DOS 4 source code on GitHub — 45 year old code now open-source | Poal: Say what you want.

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

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https://betawiki.net/wiki/Multitasking_MS-DOS_4

4.0 was supposed to be under the hood for OS/2.

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