MS-DOS 2.11

MS-DOS 2.11 is a version of MS-DOS 2.x. In 2014, Microsoft for the first time published the source code for this version.

Source code
The source code contains the following files: 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.

Change log
2.11 08/12/83 Dos split into several more modules for assembly on              an IBM PC