List of IBM PC Dos versions

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This is a listing of the versions of the operating systems that were offered by IBM as Dos (PC Dos).

1 Versions
2 References
3 See also
4 External links

[edit] Versions

PC Dos 3.2 Box shot

PC DOS 1.0 - August 1981 – initial release with the first IBM-PC FAT-12, with no subdirectory support.
PC DOS 1.1 - May 1982 – support for 320 kB double-sided floppy disk.
PC-DOS 2.0 - March 1983 - had a maximum disk partition size of 10MB, came on two 180 kB 5.25-inch disks or one double-sided 360 kB disk.
PC DOS 2.1 - October 1983 – support for IBM PCjr.
PC DOS 3.0 - August 1984 - support added for DS/HD 1.2MB floppy disk drives. Introduces FAT-16 file system on hard drives.
PC DOS 3.1 - March 1985 - COMMAND.COM has 23210 bytes.
PC-DOS 3.2 - December 1985 - required 128 kB RAM and came on one 720 kB disk or two 5.25 disks.
PC DOS 3.3 - April 1987 – support for IBM PS/2: 1.44 MB floppy disk drives, added codepage support (international character sets).
PC DOS 4.0 - June 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.
PC-DOS 4.01 - August 1988 - came on two 3.5-inch DD diskettes (720K) and required 256 kB RAM. Mostly bug fixes. Maximum disk partition size was 2000MB.
PC-DOS 5.0 - May 1991 - three 3.5-inch DD diskettes. Able to run DOS in HMA.
PC-DOS 5.00.1 - February 1992 - bug fixes.
PC-DOS 5.02 - September 1992 - adds support for portable computers and ISO fonts
PC-DOS 6.0 - May 1993 - Beta version, not released.
PC-DOS 6.1 - June 1993 - four 3.5 inch 1.44M disks. PC-DOS and MS-DOS now offer significantly different utilities. IBM dropped QBasic and its associated MS-DOS text editor. Replaced editor with E; but added no programming language.
PC-DOS 6.2 - not released
PC-DOS 6.3 - December 1993 - five 3.5 inch 1.44M disks. Enhanced several utility programs. Became popular with OEMs because MS-DOS had stopped stand-alone, non-Windows releases at their version 6.22.
PC-DOS 7 - November 1994 - could purchase in floppy or CD-ROM format. The diskette set had a normal 1.44M installation floppy and four in a special 1.88M XDF format. Added the REXX interpretive language. Included enhanced utilities.
PC DOS 2000 - April 1998 - six diskettes (installation and five XDF) or one CD-ROM. A Year 2000 Certified release of v7.0 with fixes for Year 2000 problem (Y2K). Floppies were labeled "PC DOS 2000, Includes PC DOS 7".