They found 86-dos 0.1 and 0.34, holy fucking shit!
https://archive.org/details/86-dos-version-0.1-c-serial-11-original-disk
https://archive.org/details/86-dos-v-0.34-221-81-02-20
MS bought the code of this operating system to create MS-DOS.
Therefore this is the oldest version of dos ever and probably one of the first ever created.
@starfrost The only earlier versions would have been QDOS 0.11 (Quick and Dirty OS) which was finished in August 1980. It was renamed to 86-DOS that fall.
Interestingly, the license/contract which Seattle Computer Products had with Microsoft allowed them to continue to sell 86-DOS and all future versions of it so long as it was bundled with one of their computers. SCP originally sold a S-100 bus 8086 computer (for which they needed an OS).
@starfrost
Shouldn't this be in the Smithsonian?
@starfrost it says "Bill" in the top right.