IBM was a Disk , and Microsoft selling to the open market. However, at no time did IBM acquire the ownership of the Source Code of the Operating System for its own PCs . ThinkPad products currently have a copy of the latest version of PC-DOS in their Rescue and Recovery partition.
The final release, PC-DOS 2000, found its niche in the Embedded Software market and elsewhere. It was released to correct issues with the Year 2000 Problem . Versions 7 and 2000 supported a Diskette format known as XDF , which allowed for more data to be written to a standard floppy disk than usual.
- PC DOS 1.0 - August 1981 – ''initial release with the first IBM-PC'' (
COMMAND.COM is 3231 bytes. FAT-12, with no subdirectory support.
- PC DOS 1.1 - May 1982 – ''support for 320 KB double-sided floppy disk''.
COMMAND.COM has 4959 bytes.
- PC-DOS 2.0 - March 1983 - ''support for IBM Personal Computer XT ''. had a maximum disk partition size of 10MB, came on two 180 kB 5.25-inch disks or one double-sided 360 kB disk.
COMMAND.COM has 17664 bytes.
- PC DOS 2.1 - October 1983 – ''support for IBM PCjr ''.
COMMAND.COM has 17792 bytes.
- PC DOS 3.0 - August 1984 - ''support for IBM Personal Computer/AT ''. supports the AT's DS/HD 1.2MB floppy disk drives. Introduces FAT-16 file system on hard drives.
COMMAND.COM has 22042 bytes.
- 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.
COMMAND.COM has 23791 bytes.
- PC DOS 3.3 - April 1987 – ''support for IBM PS/2 : 1.44 MB floppy disk drives, added codepage support (international character sets)''.
COMMAND.COM is 25307 bytes.
- 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''.
COMMAND.COM has 37637 bytes.
- 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 .
COMMAND.COM has 47987 bytes.
- PC-DOS 5.00.1 - February 1992 - bug fixes.
COMMAND.COM has 48025 bytes.
- PC-DOS 5.02 - September 1992 - adds support for portable computers and ISO fonts
COMMAND.COM has 47990 bytes.
- 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.
COMMAND.COM has 52589 bytes.
- 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 OEM s because MS-DOS had stopped stand-alone, non-Windows releases at their version 6.22.
COMMAND.COM has 54654 bytes.
- 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.
COMMAND.COM has 52956 bytes.
- 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".
COMMAND.COM has 52965 bytes.
Image:PC-DOS 3.2 box jacket.png
Image:PC-DOS 4 getting started manual.png
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- IBM Corporation and Microsoft, Inc. ''Dos 3.30: User's Guide''. IBM Corporation, 1987. Part number 80X0933.
- IBM Corporation and Microsoft, Inc. ''Dos 3.30: Reference (Abridged)''. IBM Corporation, 1987. Part number 94X9575.
- IBM Corporation. ''Getting Started with Disk Operating System Version 4.00''. IBM Corporation, 1988. Part number 15F1370.
- IBM Corporation. ''Using Disk Operating System Version 4.00''. IBM Corporation, 1988. Part number 15F1371.
- IBM Corporation. ''IBM Disk Operating System Version 5.0. User Guide and Reference''. IBM Corporation, 1991. Part number 07G4584.
- IBM Corporation. ''PC DOS 7 User's Guide''. IBM, 1995.
- IBM Corporation. ''IBM PC DOS and Microsoft Windows User's Guide''. Indianapolis, IN: Que Corporation, 1995. ISBN 0-7897-0276-2.
- 16bitos.com detailed lists of PC-DOS and MS-DOS versions
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