I have a DOS 6.1 Manual at home and it is like 5 inches thick. Microsoft owns pattents on some DOS versions. Maybe they have a manual online. My manual was a commercial book by a third party.
DOS could be Microsoft, Tandy, or some other like IBM, or Freeware DOS. When I think of DOS, I think mostly of Microsoft DOS, but there are many versions of DOS. Since DOS is an acronym, which is Disk Operating System, that is just a generic term.
If you read the book Accidental Empires by Robert X. Cringely you can get a lot if info on this subject.
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