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Commodore 64

MS-DOS Timeline

• PC DOS 1.0 - August 1981 - Initial release with the first IBM-PC
• PC DOS 1.1 - May 1982
• MS-DOS 1.25 - May 1982 - First release for non-IBM hardware
• MS-DOS 2.0 - March 1983 - Introduced features from Unix such as subdirectories, handle-based file operations, command input/output redirection, and pipes. Microsoft decided to use backslashes as pathname separators rather than slashes as on Unix apparently due to the latter character being used as the switch character in most DOS and CP/M programs. Adds support for hard drives and 360KB floppy disks
• PC DOS 2.1 - October 1983
• MS-DOS 2.11 - March 1984
• MS-DOS 3.0 - August 1984 - Adds support for 1.2MB floppy disks and larger hard disks
• MS-DOS 3.1 - November 1984
• MS-DOS 3.2 - January 1986 - Supported 2 hard disk partitions of up to 32MB, one primary and one "logical drive" in an "extended partition"
• PC DOS 3.3 - April 1987
• MS-DOS 3.3 - August 1987 - Supported multiple logical drives
• MS-DOS 4.0 - June 1988 - actually derived from IBM's codebase rather than the reverse
• PC DOS 4.0 - July 1988 - added the DOS Shell, a graphical menu selector, & support for hard disks of >32MB using the format from Compaq DOS 3.31. Also added many bugs and offered less free conventional memory than before. Generally regarded as an unsuccessful release and to be avoided
• MS-DOS 4.01 - November 1988 - bug-fix release
• MS-DOS 5.0 - June 1991 - In response to DR-DOS 5.0, adds comparable features to that product: memory management, full-screen editor, QBasic programming language, online help, and DOS Shell gains task switcher.
• MS-DOS 6.0 - March 1993 - Response to DR-DOS 6.0. Added DoubleSpace disk compression (copied from Stacker) and other features
• MS-DOS 6.2 - November 1993 - Bug fix release
• MS-DOS 6.21 - February, 1994 - Following Stac lawsuit, removed DoubleSpace disk compression
• PC DOS 6.3 - April 1994
• MS-DOS 6.22 - June 1994 - Last official stand-alone version. DoubleSpace replaced with non-infringing but compatible DriveSpace tool
• PC DOS 7.0 - April,1995 - Bundles Stacker in place of DriveSpace
• MS-DOS 7.0 - August 1995 - Shipped embedded in Windows 95. Included large disk (LBA) and Long File Name (LFN) support
• MS-DOS 7.1 - August 1996 - Shipped embedded in Windows 95B (OSR2) (and Windows 98 in June 1998). Added support for FAT32 file system
• MS-DOS 8.0 - September 2000 - Shipped embedded in Windows ME. Last version of MS-DOS. Removes SYS command, ability to boot to command line and other features
• PC DOS 2000 - Year 2000-compliant version with minor additional features. Final member of the MS-DOS family

(Source: PC Museum)

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MS-DOS