Microsoft's recent release of the source code for MS-DOS 4.0 is not just a technological move but a significant step towards preserving our computing heritage. On April 25, 2024, the company took a monumental step by archiving this pivotal computing history on its official GitHub repository, thereby opening the doors for software developers, students, and technology enthusiasts worldwide to delve into this piece of history.

The MS-DOS 4.0 operating system, which emerged in the late 1980s, brought with it a host of enhancements that set it apart from its predecessors. It's worth noting that Microsoft and IBM collaborated on developing DOS 4.0, and even worked on a parallel branch called Multitasking DOS (MT-DOS), which unfortunately never saw widespread distribution.

On April 25, 2024, Microsoft and IBM jointly unveil the source code of MS-DOS 4.00 under the MIT license. This move embodies the spirit of open innovation, allowing curious minds to explore the intricate mechanisms behind this influential operating system. In the 1980s and early 1990s, MS-DOS reigned supreme as the dominant operating system for personal computers. Its command line interface empowered users to execute programs and manage files.

The release of the MS-DOS 4.0 source code is not just a sentimental gesture, but a practical one. It opens opportunities for aspiring software developers to dissect the code and gain insights into historical computing practices. Moreover, students and educators can now use this resource to teach the foundations of operating systems, making it a valuable educational tool.

The MS-DOS 4.0 source code resides in Microsoft's GitHub repository. Although it is now read-only and no longer open for contributions, it remains a treasure trove of computing history.

Let's celebrate this milestone—a journey back to the roots of personal computing—and appreciate the collaborative efforts that have made it possible.

Disclaimer: This article is for informational purposes only and does not constitute professional advice. Readers are encouraged to explore the source code and engage in educational endeavors.

For direct access to the MS-DOS 4.0 source code, visit Microsoft's GitHub repository.