MS-DOS 2.11

MS-DOS 2.11 is a build of MS-DOS 2, it was released in October 1983 by a number of OEMs. In 2014, Microsoft for the first time published the source code for this version and MS-DOS 1.25.

Source code
Microsoft published the source code of:
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The OEMs were expected to supply their own  (if they wish to support hard drive),   (for their own machine containing their own copyright strings), a more usable   with a boot sector and any apps they wish to include (,   and etc.). Some OEMs customized this version of MS-DOS to support 720KB 3.5" floppy drives.

Same as earlier versions of MS-DOS, the original non-OEM  binary files contain the string   (from   in the source code).

Interestingly, this version of MS-DOS's  and   reports the same version upon boot.