MS-DOS 5 Beta

The MS-DOS 5.0 project started in December 1989. Codenamed "Lifeboat", it is based on MS-DOS 4.00 code. It was the first version of MS-DOS to use beta builds.

Several MS-DOS 5.00 betas were released before the final launch:

Builds	Description	Desktop Screenshot
Build 70	Build 70 is MS-DOS 5.00 Pre-Beta 1 Build.
Build 112	Build 112 is MS-DOS 5.00 Pre-Beta 1 Build.
Build 223	Build 223 is MS-DOS 5.00 Beta 1 Build.
Build 224	Build 224 is MS-DOS 5.00 Beta 1 Build dated to 06-07-1990. Dosshell is split into three parts: Color Manager, File Manager and Program Manager.
Build 225	Build 225 is MS-DOS 5.00 Beta 1 Build.
Build 226	Build 226 is MS-DOS 5.00 Beta 1 Build.
Build 227	Build 227 is MS-DOS 5.00 Beta 1 Build.
Build 333	Build 333 is MS-DOS 5.00 Beta 2 Build dated to 08-15-1990. Is the first MS-DOS 5.00 Builds to have Task Swapper
Build 392b	Build 392b is MS-DOS 5.00 Beta 2 Build.
Build 409c	Build 409c is December 1990 build of MS-DOS 5.00.	MS-DOS 5 Beta Command.com
Build 432	Build 432 is January 1991 build of MS-DOS 5.00.
Build 460	Build 460 is late January 1991 build of MS-DOS 5.00 dated January 30, 1991
Build 490	Build 490 is early February 1991 build of MS-DOS 5.00 dated February 7, 1991	MS-DOS 5.00.490 Beta Command
Build RC1	Build RC1 is first Release Candidate Builds dated on Feb 28, 1991.
Build RC3	Build RC3 is the first third Release Candidate builds.
Build RC3A	Build RC3A is the Release Candidate dated on March 8, 1991.
Build RC10	Build RC10 is dated at March 22, 1991. It seems to be the final Release Candidate.

See also

• DOS API
• List of DOS commands
• Timeline of DOS operating systems