MIT License

Copyright (c) Microsoft Corporation.

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE

<imgwidth="150"height="150"align="left"style="float:left;margin:010px00;"alt="MS-DOS logo"src="https://github.com/Microsoft/MS-DOS/blob/master/msdos-logo.png">

<imgwidth="150"height="150"align="left"style="float:left;margin:010px00;"alt="MS-DOS logo"src="https://github.com/Microsoft/MS-DOS/blob/main/msdos-logo.png">

This repo contains the original source-code and compiled binaries for MS-DOS v1.25 and MS-DOS v2.0.

These are the same files[originally shared at the Computer History Museum on March 25th, 2014](http://www.computerhistory.org/atchm/microsoft-ms-dos-early-source-code/) 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.

All files within this repo are released under the[MIT (OSI) License](https://en.wikipedia.org/wiki/MIT_License) as per the[LICENSE file](https://github.com/Microsoft/MS-DOS/blob/master/LICENSE.md) stored in the root of this repo.

All files within this repo are released under the[MIT License](https://en.wikipedia.org/wiki/MIT_License) as per the[LICENSE file](https://github.com/Microsoft/MS-DOS/blob/main/LICENSE) stored in the root of this repo.

The source files in this repo are for historical reference and will be kept static, so please**don’t send** Pull Requests suggesting any modifications to the source files, but feel free to fork this repo and experiment 😊.

If, however, you’d like to submit additional non-source content or modifications tonon-source files (e.g., this README), please submit via PR,andwe’ll review and consider.

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 tothesource files, but feel free to fork this repoandexperiment 😊.

This project has adopted the[Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see the[Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact[opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.

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](https://www.microsoft.com/legal/intellectualproperty/trademarks/usage/general).

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.

Microsoft takes the security of our software products and services seriously, which includes all source code repositories managed through our GitHub organizations, which include[Microsoft](https://github.com/Microsoft),[Azure](https://github.com/Azure),[DotNet](https://github.com/dotnet),[AspNet](https://github.com/aspnet) and[Xamarin](https://github.com/xamarin).

If you believe you have found a security vulnerability in any Microsoft-owned repository that meets[Microsoft's definition of a security vulnerability](https://aka.ms/security.md/definition), please report it to us as described below.

**Since MS-DOS is historical reference software, this file is in place as a template only.**

**Please do not report security vulnerabilities through public GitHub issues.**

Instead, please report them to the Microsoft Security Response Center (MSRC) at[https://msrc.microsoft.com/create-report](https://aka.ms/security.md/msrc/create-report).

If you prefer to submit without logging in, send email to[secure@microsoft.com](mailto:secure@microsoft.com). If possible, encrypt your message with our PGP key; please download it from the[Microsoft Security Response Center PGP Key page](https://aka.ms/security.md/msrc/pgp).

You should receive a response within 24 hours. If for some reason you do not, please follow up via email to ensure we received your original message. Additional information can be found at[microsoft.com/msrc](https://www.microsoft.com/msrc).

Please include the requested information listed below (as much as you can provide) to help us better understand the nature and scope of the possible issue:

* Type of issue (e.g. buffer overflow, SQL injection, cross-site scripting, etc.)

* Full paths of source file(s) related to the manifestation of the issue

* The location of the affected source code (tag/branch/commit or direct URL)

* Any special configuration required to reproduce the issue

* Step-by-step instructions to reproduce the issue

* Proof-of-concept or exploit code (if possible)

* Impact of the issue, including how an attacker might exploit the issue

This information will help us triage your report more quickly.

If you are reporting for a bug bounty, more complete reports can contribute to a higher bounty award. Please visit our[Microsoft Bug Bounty Program](https://aka.ms/security.md/msrc/bounty) page for more details about our active programs.

We prefer all communications to be in English.

Microsoft follows the principle of[Coordinated Vulnerability Disclosure](https://aka.ms/security.md/cvd).