The excellent bitsavers.org last week uploaded scans of several IBM Personal Computer DOS manuals. Included are the manuals for DOS 1.0 (1982), 1.1, and 2.0, a preliminary technical reference for DOS 3.1, the DOS 3.1 user’s reference manual, and DOS 3.3 technical reference.
Note that the old DOS manual also contained programming reference information; over time, much of the content moved over to the Technical Reference, as did some of the tools (such as the linker).
At the same time bitsavers.org also added several scans of IBM PC/XT/AT hardware references, although those have been available elsewhere—unlike the DOS manuals. The PCjr and PC Convertible technical references are a nice addition, too.
The IBM PC section of bitsavers.org has just become significantly more complete and useful. Thanks, bitsavers!