DOS Versions

2008 Oct 18


Dos
Version
Date Floppy
Sizes
Change
1.0 1981 Aug 5.25" Original from IBM.
1.1 1982 May 5.25" Adds support for double-sided floppy disks.
1.25 198? ??? 5.25" Released under Microft label, same as version 1.1.
2.0 1983 Jan 5.25" MS for Zenith Z-100 for IBM-XT. Rewrite.
Support for 10MB hard drives, subdirectories and 360K diskettes.
2.1 1984 Mar 5.25" Supports PC Jr.
2.11 1984 ??? 5.25" Supports non-English languages and alternate date formats.
3.0 1984 ??? 5.25" Adds support for 1.2MB diskettes and disk sizes over 10MB.
3.1 1984 Nov 5.25" Adds MS networks support.
3.2 1986 Jan 5.25" Adds support for 720K disks.
3.25 198? ??? 5.25" ??
3.3 1987 ??? 5.25" Compaq version. Adds support for 1.44MB
diskettes and multiple 32MB disk partitions.
3.31 1987 Nov 5.25" Introduced by Compaq. Supports drives larger than 32MB.
4.0 1988 ??? 5.25"
3.5"
Adds shell menu interface and disk partitions over 32MB
and graphical/mouse interface.
4.01 1988 Nov 5.25"
3.5"?
Not sold separately from computer.
5.0 1991 Jun 5.25"
3.5"
Adds full screen editor, undelete, unformat, and task swapping.
Replaces GW-Basic with QBasic.
5.0a 199? ??? 5.25"
3.5"
Termed "Y2K compliant with minor issues" by Microsoft.
6.0 1993 Mar 5.25"
3.5"
Includes DoubleSpace disk compression. A 3-Pack version
of this was also sold for use on three PCs. System requirements:
MS-DOS 2.11 or later, OS/2, or an operating system compatible
with MS-DOS 2.11 or later. Personal computer with 8088 or higher
processor. 512K of RAM.
6.2 1993 Nov 5.25"
3.5"
A special edition bundled with "Dummies" book.
6.21 1994 Feb 5.25"
3.5"
Removed DoubleSpace under court order.
6.22 1994 Jun 5.25"
3.5"
Bundled with "MS-DOS for Dummies" book. You must be
running MS-DOS 2.11 or compatible and later to install it.
7.0 1995 ??? 5.25"
3.5"
Windows95. Adds support for long file names.
7.1 1998 ??? 5.25"
3.5"
Windows98

External Links

  • EMSPS (sells old versions)
  • NWPMS
  • FreeDos
  • secretguide2pcs.tripod.com/MS-DOS.htm
  • Windows/DOS Versions
  • Guidlines
  • undercover dos
  • MS DOS partition info
  • Get into DOS
  • Indiana University Knowledge Base
  • FAT-12 and old DOS
  • Notes on sys.com
  • Old DOS versions

    2005-2008