Microsoft finally open sources DOS 1.0 - and it's so much more than the code

Microsoft finally open sources DOS 1.0 - and it's so much more than the code ...

Microsoft open-sources 86-DOS 1.00, the ancestor of Windows

Microsoft just released the source code for 86-DOS 1.00, made available as an open-source project on GitHub. The release ...
Popular Science

How to get MS-DOS up and running on Windows or macOS

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Ars Technica

Microsoft open-sources infamously weird, RAM-hungry MS-DOS 4.00 release

Microsoft has open-sourced another bit of computing history this week: The company teamed up with IBM to release the source code of 1988’s MS-DOS 4.00, a version better known for its unpopularity, ...
Neowin

A quick look back at the official announcement of Microsoft Windows 1.0 40 years ago today

The year was 1983. Microsoft was slowly becoming a well-known tech company in the PC space. Two years before, in 1981, Its MS-DOS operating system would be installed in the first IBM PC. It launched ...
TechSpot

Microsoft releases MS-DOS 4.0 source code and floppy images through an open-source license

TL;DR: Microsoft will likely never release the original source code of Windows into the wild, but the company is clearly interested in sharing important episodes of its software development history.