IBM PC-DOS

PC-DOS (Personal Computer Disk Operating System) is an operating system for x86 based personal computers developed by Microsoft and IBM (later by IBM exclusively). Up to version 5.00, PC-DOS (then called IBM DOS) was just a rebranded IBM OEM version of MS-DOS, though IBM used their own versioning system. However, with version 5.00, IBM decided to continue PC-DOS development without Microsoft and renamed the product to IBM PC-DOS. Therefor, version 5.00 and later are IBM's own creation independent of MS-DOS. The first version released was version 1.00 and the last version was PC-DOS 2000, an updated release of PC-DOS 7.0.

Known versions

PC-DOS 1.x

• PC-DOS:1.00
• PC-DOS:1.10

PC-DOS 2.x

• PC-DOS:2.00
• PC-DOS:2.10

PC-DOS 3.x

• PC-DOS:3.00
• PC-DOS:3.10
• PC-DOS:3.20
• PC-DOS:3.30

PC-DOS 4.x

• PC-DOS:4.00
• PC-DOS:4.01 - Very rare, same fixes as MS-DOS 4.01, but released by IBM in 4.00 packaging. The only evidence of this being 4.01 and not just regular 4.00 is on the floppy disk labels where it clearly says 4.01.

PC-DOS 5.x

• PC-DOS:5.00 - First version after the breakup
• PC-DOS:5.00.1 - Bugfixes only
• PC-DOS:5.00-V - Japanese PC-DOS 5.00
• PC-DOS:5.02
• PC-DOS:5.02-V - Japanese PC-DOS 5.02

From this point on, PC-DOS versions complement MS-DOS versions (e.g. MS-DOS 6.00 -> PC-DOS 6.10 -> MS-DOS 6.20 -> PC-DOS 6.30)

PC-DOS 6.x

• PC-DOS:6.1 - 1993-11
• PC-DOS:6.10
• PC-DOS:6.30

PC-DOS 7.x

• PC-DOS:7.00 - 1994-10-13 Beta
• PC-DOS:7.00 - 1994-10-13 Beta revision 3
• PC-DOS:7.00
• PC-DOS:7.10 - Existance unconfirmed
• PC-DOS:J7.00-V - Japanese PC-DOS 7.00
• PC-DOS:P7.00 - Chinese Simplified PC-DOS 2000
• PC-DOS:2000 - PC-DOS 7.0 with Y2K and other fixes on a single CD-ROM