MS-DOS

MS-DOS (Microsoft Disk Operating System) is an operating system for x86 based personal computers. It was based on QDOS (Quick and Dirty Operating System), also known as 86-DOS, which was made by Tim Paterson and purchased by Microsoft. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for personal computers during the 1980s and 1990s. It was preceded by M-DOS (also called MIDAS), designed and copyrighted by Microsoft in 1979. MS-DOS was written for the Intel 8086. family of microprocessors, particularly the IBM PC and PC compatible and compatibles. It was gradually replaced on consumer desktop computers by operating systems offering a graphical user interface (GUI), in particular by various generations of the Microsoft Windows operating system.

Microsoft and IBM both had their own versions of MS-DOS. There are not many differences between the two versions before the split up, when IBM started developing PC-DOS independently of Microsoft. IBM distributed their version of MS-DOS first as IBM DOS (prior to version 5.0), and later on as IBM PC-DOS.

Known versions

MS-DOS 1.x

• MS-DOS:1.12 - Compaq OEM
• MS-DOS:1.19 - Zenith OEM
• MS-DOS:1.20 - Zenith OEM
• MS-DOS:1.25 - Corona, Zenith and Sanyo OEM

MS-DOS 2.x

• MS-DOS:2.00 - Olivetti OEM
• MS-DOS:2.11 - AT&T, BULL, TeleVideo, Olivetti, Toshiba, Apricot, NEC, NCR and Tandy OEM
• MS-DOS:2.11D - Ericsson OEM
• MS-DOS:2.12B - Compaq OEM
• MS-DOS:2.13 - Zenith OEM
• MS-DOS:2.21 - Zenith OEM
• MS-DOS:2.25 - Same as 2.11, but has better support for Japanese and Korean character sets. Released in October 1985, as stated in a Croatian computer magazine "Moj Mikro".

MS-DOS 3.x

• MS-DOS:3.00 - Apricot OEM
• MS-DOS:3.06 - Apricot OEM
• MS-DOS:3.10 - Seiko Epson, Phoenix, Tandon, Apricot, Sperry, Fujitsu and Olivetti OEM
• MS-DOS:3.10C - RM Nimbus and Ericsson OEM
• MS-DOS:3.10L24 - Japanese, for Fujitsu FM-Towns
• MS-DOS:3.20 - HP, Amstrad, Apricot, AT&T, Tandy and Seiko Epson OEM
• MS-DOS:3.20E - BULL OEM
• MS-DOS:3.21 - Hyosung, KayPro, Zenith, Goupil, and Compaq OEM
• MS-DOS:3.30 - Amstrad, HP, Dell, NEC, Tulip, AT&T, Tandy, Olivetti, Tandon, Seiko Epson and Toshiba OEM
• MS-DOS:3.30+ - Zenith OEM
• MS-DOS:3.30A - Retail
• MS-DOS:3.30B - for NEC PC-98
• MS-DOS:3.30C - for NEC PC-98
• MS-DOS:3.30D - for NEC PC-98
• MS-DOS:3.31 - Compaq and Olivetti OEM
• MS-DOS:3.31D - Compaq OEM

MS-DOS 4.x

• MS-DOS:4.00 - Quickly replaced by 4.01 due to a severe bug
• MS-DOS:4.01 - Olivetti, Amstrad, Nokia, Tulip, HP, Toshiba, Zenith and VEGAS OEM
• MS-DOS:4.01A - Nokia OEM

MS-DOS 5.x

• MS-DOS 5.00.070 - Existance suggested by ROM-DOS 5.00.070 [1]
• MS-DOS:5.00.112 - Beta
• MS-DOS:5.00.224 - Beta
• MS-DOS:5.00.225 - Beta
• MS-DOS:5.00.226 - Beta
• MS-DOS:5.00.227 - Beta
• MS-DOS:5.00.333 - Beta
• MS-DOS:5.00.409c - Beta
• MS-DOS:5.00.432 - Beta
• MS-DOS:5.00.460 - Beta
• MS-DOS:5.00.481 - Beta
• MS-DOS:5.00.1180 - Unknown stage
• MS-DOS:5.00 RC3A - Release Candidate 3A (currently incomplete)
• MS-DOS:5.00 RC10 - Release Candidate 10
• MS-DOS:5.00 - HP, Dell, Compaq, Tandy and PC Kenitec OEM
• MS-DOS:5.00a - Toshiba OEM
• MS-DOS:5.00A - for NEC PC-98
• MS-DOS:5.00A-H - for NEC PC-98

MS-DOS 6.x

• MS-DOS:6.00.0015 - Beta
• MS-DOS:6.00.0204 - Beta
• MS-DOS:6.00.0305 - Beta
• MS-DOS:6.00 RC1 - Release Candidate 1
• MS-DOS:6.00 RC4 - Release Candidate 4
• MS-DOS:6.00 - HP, Packard Bell, Fujitsu and NEC OEM
• MS-DOS:6.20 - Retail
• MS-DOS:6.20L10 - Japanese, for Fujitsu FM-Towns
• MS-DOS:6.20-V - Japanese MS-DOS 6.20
• MS-DOS:6.21 - Retail
• MS-DOS:6.22 - Retail

MS-DOS 7.x

• MS-DOS:7.00 B1 - Beta 1
• MS-DOS:7.10 - Retail

MS-DOS 8.x

• MS-DOS:8.00 Only used in Windows ME, and can be found in Windows operating systems after it