In March 2014, Microsoft had released the source code to MS-DOS 1.25 and 2.0 via the Computer History Museum. A few days ago, they have re-released that same source on GitHub so it's much easier to find. Microsoft encourages exploring and experimenting with the source, but ask people not to send Pull Requests, as this publishing is purely for historical purposes.
You can check out MS-DOS on GitHub here.

Source - Microsoft Developer Blog
Coverage of the original release 4 years ago by FAST6191

 

[Akdul]

Seeing that MS-DOS logo brings back some memories-


Totally, SkyRoads is easily one of my favorites. Loved the music, too.

Laser Light was another one of my favorites: https://archive.org/details/msdos_Laser_Light_1994

I didn't play that one, but it reminded me of The Incredible Machine, which was awesome too.

 

[Jayro]

This is nothing short of amazing. Can't wait to see what cool projects come of this.

 

[GBAer]

That's nice of themr releasing the code which Bill Gates bought for $75000 and which went on to make him a billionaire.

 

[pedro702]

now we can get a much better doesbox on consoles if source code is ported rather than hacky dosbox

 

[x65943]

now we can get a much better doesbox on consoles if source code is ported rather than hacky dosbox

Doesn't it say in OP that the source has been public for a while now, and that this just represents another upload but this time to git?

 

[pedro702]

Doesn't it say in OP that the source has been public for a while now, and that this just represents another upload but this time to git?

yeah but no one ever ported the source code, now that is on gith its more visible so maybe they will port the source code instead of emulating dosbox like we do.

 

[tech3475]

Not too surprising since MS own Github now.

 

[shadoom]

This is so epic!
Alexa, play DOSpacito

 

[Deleted User]

View attachment 145396​

In March 2014, Microsoft had released the source code to MS-DOS 1.25 and 2.0 via the Computer History Museum. A few days ago, they have re-released that same source on GitHub so it's much easier to find. Microsoft encourages exploring and experimenting with the source, but ask people not to send Pull Requests, as this publishing is purely for historical purposes.
You can check out MS-DOS on GitHub here.

Source - Microsoft Developer Blog
Coverage of the original release 4 years ago by FAST6191

Horray!

 

[pasc]

Ha, saw the logo, and thought to myself: probably the source code. Yay. Nice one MS

 

[Brawl345]

Doesn't it say in OP that the source has been public for a while now, and that this just represents another upload but this time to git?

It's also now MIT licensed instead of the restrictive Microsoft Research License.

 

[tbb043]

This is it, folks.
Time to start working on MS-TRES

Unless you can come up with a good acronym to make TRES. Tertiary Register Executable System or some other technobabble that's less bullshit than what i just came up with.

 

[ShadowOne333]

Unless you can come up with a good acronym to make TRES. Tertiary Register Executable System or some other technobabble that's less bullshit than what i just came up with.

I was going with the spanish numbers, like Articuno, Zapdos and Moltres did for Pokemon
But oh well, guess the joke is not that implicit.

 

[matpower]

yeah but no one ever ported the source code, now that is on gith its more visible so maybe they will port the source code instead of emulating dosbox like we do.

It is not how this works, the reason DOSBOX exists is to emulate the HARDWARE, the software itself is well documented and there is a reversed engineered solution I mentioned last page. Having MS-DOS source code doesn't change a thing in this day and age, specially with such an old version. If it was at least MS-DOS 4.0, it would have some use, 6.22 would be the very best since it would help fix the edge case on Windows 3.11.

Doesn't it say in OP that the source has been public for a while now, and that this just represents another upload but this time to git?

People can't read anymore.

 

[smf]

Will this improve DOSbox or make it easier to port or is all of this basically already known?

Loads of books on MSDOS internals have been published over the years. I can't imagine there is anything in there that would be helpful.

Having the actual source code is more a historic thing.

 

[SavageNoble]

This is nothing short of amazing. Can't wait to see what cool projects come of this.

I mean it's been out there for years now: https://gbatemp.net/threads/microso...rce-code-also-word-for-windows-source.363749/
Also the code isn't even buildable, some files are corrupted or missing.

DOS 8.0 source code - now that's be cool. I wonder if ReactOS could benefit from it and how.

 

[WhiteMaze]

Ahh the good old days of typing multiple lines of directories, and failing at least twice, just to boot up Duke Nukem 3D.

Thank the Lord that's over I hated it.

 

[ry755]

Ahh the good old days of typing multiple lines of directories, and failing at least twice, just to boot up Duke Nukem 3D.

Thank the Lord that's over I hated it.

I always forget that MS-DOS doesn't have tab completion or command history

 

[astronautlevel]

Interestingly this is the exact same source code as the one fantasti released 4 years ago, with the exact same errors that make it uncompileable. Really, Microsoft?

 

[smileyhead]

Interestingly this is the exact same source code as the one fantasti released 4 years ago, with the exact same errors that make it uncompileable. Really, Microsoft?

Well, they did state it's just a re-release of the same code.

 

[astronautlevel]

Well, they did state it's just a re-release of the same code.

Yeah, but I hoped they were going to fix problems such as files being missing with this, oh well.