MS-DOS 2

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

MS-DOS 2.01
MS-DOS 2.01 was released in November 1983. 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.

MS-DOS 2.01a
MS-DOS 2.01a is the Wang Professional Computer OEM of MS-DOS 2.01, released in 1985. It is sometimes mislabelled as "MS-DOS 2.10a".

MS-DOS 2.05
MS-DOS 2.05 was released in October 1983 as an OEM version for the DEC Rainbow 100 computer only. It was distributed on a single sided high density 5.25" 400KB disk.

MS-DOS 2.10
MS-DOS 2.10 was released sometime in 1985 as an OEM version for the Eagle 1600, Eagle PC, Eagle PC Plus, Eagle Spirit and Eagle Turbo computers only.

MS-DOS 2.11
MS-DOS 2.11 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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 * (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 2.12
MS-DOS 2.12 was released in 1984 as an OEM version for the Compaq personal computers.

MS-DOS 2.21
MS-DOS 2.21 is mentioned in the source code for Windows NT 3.5 build 782.1 in the file. /*     ** Get DBCS lead byte table. This function has been supported since ** DBCS MS-DOS 2.21. */

MS-DOS 2.25
MS-DOS 2.25 is the last version from the MS-DOS 2 family. It was released in October 1985.