DOS definition of DOS in the Free Online Encyclopedia.

DOS

(1) (Disk Operating System) Pronounced "dahss." An earlier single-user operating system from Microsoft for the PC. It was the first operating system for IBM and IBM-compatible PCs and remained the underlying control program for Windows 3.1, 95, 98 and ME. In order to support DOS applications, Windows NT, 2000, XP and Vista include their own version of DOS, called "DOS emulation."

Although DOS in the IBM PC was called "PC-DOS," and the DOS used by all other vendors was called "MS-DOS," all releases of PC-DOS and MS-DOS were generally referred to as "DOS." Except for DOS 6, which contained different versions of various utilities, PC-DOS and MS-DOS commands and system functions were the same. A great number of DOS commands have been executable in all versions of Windows. See DOS abc's.

DOS Lives On
In various versions, DOS is still deployed where a small OS footprint is required, typically for embedded systems. Having gone through many incarnations, Digital Research's DR-DOS is still available (see DR-DOS). Other DOS versions are ROM-DOS from DataLight (www.datalight.com) and the open source FreeDOS (see FreeDOS).

(2) (DOS, DOS/370, DOS/VS, DOS/VSE, VSE/ESA) A series of IBM mainframe "disk operating systems" for System/360, System/370 and System/390. DOS started as a variant of TOS (Tape Operating System), but soon supplanted TOS as disk storage became accepted in the late 1960s. DOS was always the "junior partner" to OS/360 and its progeny. It continues today as VSE/ESA.

(3) (Disk Operating System) A generic term for operating system. See operating system.

(4) (DoS) See denial of service.

DOS™ Computing

disk-operating system, often prefixed, as in MS-DOS and PC-DOS; a computer operating system

DOS [däs]

(computer science)

disk operating system

(operating system)

DOS - 1. The common abbreviation for MS-DOS.

2. IBM's Disk Operating System.

3. Any disk operating system.

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No references found	Duplex libelli dos est: quod risum movet, Et quod prudenti vitam consilio monet. Fables by Aesop View in context	dorsigrade dorsocaudad dorsomedial Dorson, Richard M. dorsoposteriad dorsum Dort dorter Dorticos Torrado, Osvaldo Dorticós Torrado, Osvaldo Dortmund Dortmund-Ems Canal dortour DORUM Dorus Dorval Dorval, Marie Dorvilleidae dory Dorylaeum Dorylaeum, Battle Dorylaimoidea Dorylinae Dorypteridae Dorzhi Banzarov DOS DOS % DOS . DOS .. DOS :: DOS 5 DOS 6 DOS 7 DOS abc's DOS abc's - How a disk is organized DOS abc's - How to enter a command DOS abc's - How to run a program DOS abc's - What else you need to know DOS Append DOS archive files DOS Assign DOS Attrib DOS AUTOEXEC.BAT DOS backslash DOS Backup/Restore DOS batch file DOS box DOS Break DOS Cd DOS changing directories DOS Chkdsk	Dorval Dorval Ball Hockey League Dorval, Marie Dorval, Quebec Dorvilleidae dory dory dory Dorylaeum Dorylaeum, Battle Dorylaimoidea Dorylaion Dorylinae Dorylinae Dorylini Dorylini Dorylus Doryopteris Doryopteris pedata Doryphora Doryphoros Doryphorus Dorypteridae Doryx Doryx Dorzhi Banzarov Dorzolamide dorzolamide hydrochloride Dorzolamide/Timolol Fixed Combination DOS DOS % DOS . DOS .. DOS / DOS / DOS :: DOS \ DOS 4 DOS 4 DOS 4 DOS 4 DOS 5 DOS 6 DOS 7 Dos a dos DOS abc's DOS abc's - How a disk is organized DOS abc's - How to enter a command DOS abc's - How to run a program DOS abc's - What else you need to know DOS Abort, Retry dos and don'ts DOS antivirus DOS Append DOS application DOS application DOS application DOS application DOS archive files DOS Assign

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Duplex libelli dos est: quod risum movet, Et quod prudenti vitam consilio monet.

Fables by Aesop View in context