Microsoft’s open sourcing of 86-DOS and what it means

· David Farquhar · May 3, 2026, 5:30 p.m.
retro computing open-source software 86-DOS History of Computing PC DOS
Summary
Microsoft has open sourced 86-DOS, the precursor to PC DOS 1.0, which opens up discussions about its historical significance and the controversies surrounding early DOS versions.
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