Versions
| QDOS v0.1 | July 1980 | Roughly half completed version of the OS. |
| QDOS v0.11 | August 1980 | Bug fix. |
| 86-DOS v0.33 | December 1980 | First version distributed to OEMs and Microsoft. |
| 86-DOS v0.60 | The file DOSIO.ASM found in v1.00 mentions that it is the "I/O System for 86-DOS version 0.60 and later." |
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| 86-DOS v1.00 | April 1981 | Modified system calls. |
| 86-DOS v1.14 | July 1981 | Renamed MS-DOS as of July 27, 1981. |
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“The assumption must be that those who can see value only in tradition, or versions of it, deny man’s ability to adapt to changing circumstances.”
—Stephen Bayley (b. 1951)