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


(computer science)


(operating system)
1. The common abbreviation for MS-DOS.

2. IBM's Disk Operating System.

3. Any disk operating system.


(1) See denial of service.

(2) (Disk Operating System) Any operating system that supports hard drives. See operating system.

(3) (Disk Operating System) A family of IBM mainframe operating systems (DOS, DOS/370, DOS/VS, DOS/VSE). As disk storage became accepted in the late 1960s, DOS started out as a variant of IBM's Tape Operating System (TOS); however, it was always the "junior partner" to OS/360 and its progeny. See DOS/VSE.

(4) (Disk Operating System)Pronounced "dahss." A single-user operating system from Microsoft for Intel x86 personal computers. It was the first operating system for IBM PCs and IBM-compatible PCs, and it remained the underlying control program for Windows 3.1, 95, 98 and ME. Subsequent versions of Windows incorporated all DOS functionality, and most DOS commands work the same in Windows. See cmd abc's.

The OS in the IBM PC was PC-DOS, and the OS used by all other PC makers was MS-DOS. Except for DOS 6, which contained different utilities, PC-DOS and MS-DOS commands and system functions were the same, and all PC-DOS and MS-DOS versions were commonly called "DOS." See DOS 6.

DOS Lives On
In various incarnations, DOS is still used in embedded systems, where a small OS footprint is required. Examples are Digital Research's DR-DOS, ROM-DOS from DataLight ( and the open source FreeDOS. See embedded system.
References in periodicals archive ?
So if you forget to set them both, you might find that your DOS application behaves strangely in one mode, or that it won't run at all.
After completing the set-up, DOS applications are just a mouse click away whenever they are needed.
The SunPCi card will give users of Sun's newer PCI-based workstations the same ability to run Windows and DOS applications natively that users of Sun's S-Bus workstations currently have with the SunPC(TM) co-processor card, with even greater performance.
At least back then I could switch all the files I worked with on a single floppy disk because I used text-based DOS applications that took up little.
Of course, many DOS applications may be started from Windows, but this does not make them graphical user interface programs.
Most DOS applications will run on NT with better protection from problems than DOS applications on Windows or WFW.
1, and DOS applications to run on the same desktop.
This part of the review looked only at DOS applications.
As those DOS applications disappear, the number of applications on Windows machines will probably decline somewhat.
In other words you can only run either Windows applications or DOS applications, but not both at the same time.
And DOS applications can each access up to 48MB of expanded memory.
In standard mode you can multitask Windows applications, but not DOS applications.