Continuing the Story of Early DOS Development – Microsoft Open Source Blog

Stacey Haffner, Scott Hanselman· Apr 29, 2026 · 12:41 AM UTC ·1 min read · 0 reactions · 0 comments · 2 views

In 2018 we (re)-open-sourced MS‑DOS 1.25 and 2.11, and more recently in 2024 we were able to make the source for MS‑DOS 4.0 available to the public as well. Today, on 86-DOS 1.00’s 45th anniversary, we’re continuing that tradition with the earliest DOS source code discovered to date.

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Microsoft Open Source Blog · Stacey Haffner, Scott Hanselman

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