The short version
An original 86-DOS disk image, the MS-DOS precursor.
From the HackerLinks archive
86-DOS version 0.1-C
An original 86-DOS disk image, the MS-DOS precursor.
At a glance:
First seen:2026-05-24
Last seen:2026-05-24
Times seen:1
Website:archive.org
Why it caught our attention
Commenters highlighted it as an even earlier surviving release that you can still run.
Where it surfaced on Hacker News
2026-05-24
Editorial paraphrase
One comment noted the 0.1-C binaries are earlier than the source release and can be downloaded and used in an emulator.
Original threadMicrosoft open-sources "the earliest DOS source code discovered to date"