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  1. The oldest-known version of MS-DOS’s predecessor has been …

  2. Open sourcing MS-DOS 4.0 - Microsoft Open Source Blog

  3. Microsoft open-sources infamously weird, RAM-hungry MS-DOS

  4. Microsoft and IBM Release MS-DOS 4.0’s Source Code under the …

  5. Microsoft Updates MS-DOS GitHub Repo To 4.0 - Hackaday

  6. 30 years later, FreeDOS is still keeping the dream of the command ...

  7. Microsoft explains how you can run MS-DOS 4.00 that it ... - Neowin

  8. Microsoft open sources MS-DOS 4.0 • The Register

  9. Oldest known version of DOS unearthed – MS-DOS ancestor 86-DOS

  10. Microsoft makes MS-DOS 4.0 open-source, preserving the …