1) What is the first and the last version of DOS ?

Answer 1

Which type of DOS? (Disk Operation System)

For example, Apple's original computer ran on DOS, then the PC came out and you had PC DOS and MS DOS.

I don't know if Apple was first but their DOS was made prior to IBM (PC) and MS. Meaning, I don't know if the big mainframes had a version of DOS, but my memory tells me it again was an Apple first.

Answer 2

As a stand alone os,the last version was MSDos 6.22

Answer 3

The versions of MS-DOS and PC DOS and their releases are the following:

PC DOS 1.0 - August 1981 – initial release with the first IBM-PC (COMMAND.COM is 4959 bytes)

PC DOS 1.1 - May 1982 – support for 320 kiB double sided floppy disk

MS-DOS 1.25 - May 1982 – first release for non-IBM hardware (COMMAND.COM is 4986 bytes)

MS-DOS 2.0 - March 1983 – introduced 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 – support for IBM PCjr

MS-DOS 2.11 - March 1984 – non-English language and date format support (COMMAND.COM is 16229 bytes)

MS-DOS 2.25 - October 1985 – shipped to western Pacific countries only

MS-DOS 3.0 - August 1984 – added support for PC AT: 1.2 MiB floppy disks and hard disk partitions of up to 32MB, one primary and one "logical drive" in an "extended partition"

MS-DOS 3.1 - November 1984 – support for Microsoft networking

MS-DOS 3.2 - January 1986 – support for 3.5 inch, 720 kiB floppy disk drives (v 3.21 COMMAND.COM is 23612 bytes)

PC DOS 3.3 - April 1987 – support for IBM PS/2: 1.44 MiB floppy disk drives, added codepage support (international character sets) (COMMAND.COM is 25307 bytes)

MS-DOS 3.3 - August 1987 – supported multiple logical drives (COMMAND.COM is 25276 bytes)

MS-DOS 4.0 - June 1988 – derived from IBM's codebase rather than Microsoft's

PC DOS 4.0 - July 1988 – added DOS Shell & support for hard disks of >32MB using the format from Compaq DOS 3.31. But it had many bugs and less free conventional memory than before. Generally regarded as an unpopular release

MS-DOS 4.01 - December 1988 – bug-fix release (COMMAND.COM is 37557 bytes)

MS-DOS 5.0 - June 1991 – memory management, full-screen editor, QBasic programming language, online help, and DOS Shell gains task switcher. Also add file transfer facillity licensed from Rupp Technology (FastLynx) (COMMAND.COM is 47845 bytes)

The MS-DOS 6.22 boxart.MS-DOS 6.0 - March 1993 – added DoubleSpace disk compression and other features (COMMAND.COM is 52925 bytes)

MS-DOS 6.2 - November 1993 – bug fix release (COMMAND.COM is 54619 bytes)

MS-DOS 6.21 - February, 1994 – following Stac Electronics lawsuit, removed DoubleSpace disk compression (COMMAND.COM is 54619 bytes)

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 (COMMAND.COM is 54645 bytes)

PC DOS 7.0 - April, 1995 – bundles Stacker in place of DriveSpace

MS-DOS 7.0 - August 1995 – shipped embedded in Windows 95. Included Logical block addressing 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