#school time
| Website | https://www.yazilimteknisyeni.com.tr |
| Website | https://www.yazilimteknisyeni.com.tr |
Microsoft continues to surprise the open source world.
DOS 1.0 codes are now open source
https://opensource.microsoft.com/blog/2026/04/28/continuing-the-story-of-early-dos-development/

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.