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                         VERSION - Versions of DOS

       Version        Date            Changes

        PC-DOS 1.0   Oct 1981  original release, single sided drive
        PC-DOS 1.1   Jun 1982  bugfix, double sided drive support
        MS-DOS 1.25  Jun 1982  for early compatibles
        PC-DOS 2.0   Mar 1983  PC/XT, added (hard drive &UNIX features)
        PC-DOS 2.1   Oct 1983  PCjr & portable mods, fixes for 2.0
        MS-DOS 2.11  Oct 1983  compatible equivalent to 2.1
        PC-DOS 3.0   Aug 1984  support for 1.2 Mb drive (AT)
        PC-DOS 3.1   Nov 1984  added network support, fixes for 3.0
        MS-DOS 2.25  Oct 1985  compatible; foreign language support
        PC-DOS 3.2   Jul 1986  720k 3." drive support for Convertible
        MS-DOS 3.2   Jul 1986
        MS-DOS 3.21  May 1987
        MS-DOS 3.3   Jul 1987
        PC-DOS 3.3   Apr 1987  PS/2, 1.44 disk support, mult. partitions
        MS-DOS 3.30a Feb 1988
        CPQ-DOS 3.31 Oct 1988  Compaq DOS for disk partitions > 32MB
        PC-DOS 4.00  Aug 1988  Larger DOS partitions, EMS support (bugs)
        MS-DOS 4.00  Oct 1988
        MS-DOS 4.01  Nov 1988
        MS-DOS 4.01a Apr 1989
        PC-DOS 4.01  ??? ????  Fixes for major bugs in 4.0


        - release dates vary between OEM versions
        - IBM was supposedly responsible for most changes in DOS 4.x
        - DOS 4.01 reports version 4.0, except in some vendor versions
        - DOS 5.0 is primarily a Microsoft developed version