I did see msdos 5.0 source code online several years ago.  I'm fairly certain MS never released that as any kind of source distribution, but nonetheless, it's out there.

On 12/25/2021 10:38 AM, Liam Proven wrote:
On Sat, 25 Dec 2021 at 05:43, Travis Siegel <tsie...@softcon.com> wrote:
That was caldera that released their opendos  as opensource, not Microsoft.
Caldera released Digital Research's DR DOS 7.01 as FOSS. It then
changed its mind and made v7.092 closed-source again, but 7.01 remains
FOSS and turned into OpenDOS, AKA DR OpenDOS and Open DR DOS.

And, for what it's worth, DR DOS has multitasking, and I've tried it,
and it works.

There were versions of ms dos that escaped into the wild, but it wasn't
a sanctioned release from microsoft.
This is not true.

Microsoft has released MS-DOS 1.25, 2.0 and 2.11 as FOSS.

The OS/2 Museum have rebuilt it from source:

https://www.os2museum.com/wp/pc-dos-1-1-from-scratch/

https://www.os2museum.com/wp/dos-2-11-from-scratch/




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