microsoft
MS-DOS
Assembly2018–2026
microsoft / MS-DOS · Archived
MS-DOS
The original sources of MS-DOS 1.25, 2.0, and 4.0 for reference purposes
68Distinct people
79Mentions
0Explicit recommenders
32.3KGitHub stars
What to know before exploring
What it is
The original sources of MS-DOS 1.25, 2.0, and 4.0 for reference purposes
GitHub
Where it is used
No documented product use was verified in the last source check.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
- ownedbywuigi/dos · linked in 2 of the same discussions
Mentioned in the same Hacker News threads. That is not proof they are substitutes.
This week on Hacker News
Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 1:57:11 AM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year79 dated mentions
Observed mentions: 2018-09-28 22:44:43 UTC to 2026-09-20 23:50:56 UTC.
* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 8 | 2 | 6 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 5 | 0 | 5 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 10 | 0 | 10 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 6 | 0 | 6 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 10 | 0 | 10 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 6 | 1 | 5 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 22 | 2 | 20 |
| 2025 | 2025-01-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 7 | 0 | 7 |
| 2026 (partial) | 2026-01-01 00:00:00 UTC | 2027-01-01 00:00:00 UTC | 5 | 0 | 5 |
From the project README
An excerpt from the repository, fetched Nov 12, 2026.
Read the project’s introduction
MS-DOS v1.25, v2.0, v4.0 Source Code
This repo contains the original source-code and compiled binaries for MS-DOS v1.25 and MS-DOS v2.0, plus the source-code for MS-DOS v4.00 jointly developed by IBM and
Microsoft.
The MS-DOS v1.25 and v2.0 files were originally shared at the Computer History Museum on March 25th, 2014 and are being (re)published in this repo to make them easier to find, reference-to in external writing and works, and to allow exploration and experimentation for those interested in early PC Operating Systems.
License
All files within this repo are released under the MIT License as per the LICENSE file stored in the root of this repo.
For historical reference
The source files in this repo are for historical reference and will be kept static, so please don’t send Pull Requests suggesting any modifications to the source files, but feel free to fork this repo and experiment 😊.
This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.
Trademarks
This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft
trademarks or logos is subject to and must follow
Microsoft's Trademark & Brand Guidelines.
Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship.
Any use of third-party trademarks or logos are subject to those third-party's policies.
Read the full README on GitHubWhat Hacker News says
8 sourcesIt's not without precedent!
With .NET Core [0], and ChakraCore[1] (Edge's JS engine) both being open sourced. And them having thrown the entirety of MS-DOS [2] up under the MIT license, and making a bunch of new tools and stuff under open licenses (VSCode, TypeScript, msbuild, etc...). I honestly wouldn't be surprised if they started making a push to open up many parts of Windows.
Already some devs on the Edge team have said publicly that they are working on open sourcing the whole rendering engine from Edge, and seeing that they are moving toward having Windows be more of a "platform" and less of "software you buy", it makes sense that it could eventually become an open source (or at least "open core") product.
I don't think it will happen this year, but I do think that if MS keeps going in this direction, it's more likely than not to ha
Read the rest
ppen eventually.
[0] https://github.com/dotnet/core
[1] https://github.com/Microsoft/ChakraCore
[2] https://github.com/Microsoft/MS-DOS
The original sources of MS-DOS 1.25 and 2.0 are Open Source now
29 points · Open discussionDon't overlook the email by v1.25 (and v2.0?) author Tim Paterson:
https://github.com/Microsoft/MS-DOS/blob/master/v1.25/Tim_Pa...
... or the version history in the v2.0 MSHEAD.ASM file:
https://github.com/Microsoft/MS-DOS/blob/master/v2.0/source/...
EDIT: Found better version history
In The original sources of MS-DOS 1.25 and 2.0It is pretty suprising, all things being equal.
I'd suggest keeping a close eye on this issue: https://github.com/Microsoft/MS-DOS/issues/2
In The original sources of MS-DOS 1.25 and 2.0It's MIT licensed too!
https://github.com/Microsoft/MS-DOS/blob/master/LICENSE.md
I was kind of surprised about that!
In The original sources of MS-DOS 1.25 and 2.0It looks like they set the commit dates to match the release dates: https://github.com/Microsoft/MS-DOS/commits/master
In The original sources of MS-DOS 1.25 and 2.0The original sources of MS-DOS 1.25 and 2.0
328 points · Open discussion