MS-DOS 2

MS-DOS 2 is a family of versions of MS-DOS, initially released in 1983.

MS-DOS 2.00
MS-DOS 2.00 was released in 1983-03. It added support for subdirectories, hard drives with a capacity up to 10 MB, and new commands in.

MS-DOS 2.01
MS-DOS 2.01 was released in 1983-11. It added international support via the  command from , where the user can change the time, date and currency formats to suit the country where the user originates. This version also added support for over 7000 Japanese kanji characters.

They were also some OEM branded releases of MS-DOS 2.01:


 * MS-DOS 2.01a is a Wang Professional Computer OEM of MS-DOS 2.01, which was released on 1983.
 * MS-DOS 2.05 is a DEC Rainbow OEM of MS-DOS 2.01, which was released on 1983-10. The DOS kernel  reports version 2.05, but it is simply the MS-DOS 2.01 kernel patched at offset   to report version 2.05.   was also patched to report version 2.11 (originally version 2.10). It was distributed on a single sided high density 5.25" (400KB) disk. It also appears to be patched so   does not display the copyright string upon boot.

MS-DOS 2.11
MS-DOS 2.11 was released in 1983-10 by a number of OEMs. In 2014, Microsoft for the first time published the source code for this version.

Source code
Microsoft published the source code of:
 * (partial)
 * (partial)
 * (partial)
 * (partial)
 * (partial)
 * (partial)
 * (partial)
 * (partial)
 * (partial)
 * (partial)

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.

MS-DOS 2.25
MS-DOS 2.25 is the last version of the MS-DOS 2 family. It is not exactly known when this version was released, but it is speculated that the release date was 1985-10.