DOS

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DOS

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

DOS

[däs]
(computer science)

DOS

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

2. IBM's Disk Operating System.

3. Any disk operating system.

DOS

(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.

PC-DOS and MS-DOS
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 (www.datalight.com) and the open source FreeDOS. See embedded system.
References in classic literature ?
It was impossible for Rose to pout with the prospect of a delightful boxful of gifts dancing before her eyes; so, in spite of herself, she smiled as she drank her own health, and found that fresh milk was not a hard dose to take.
I gave her every drop of ipecac in that bottle and when the last dose went down I said to myself--not to Diana or Young Mary Joe, because I didn't want to worry them any more than they were worried, but I had to say it to myself just to relieve my feelings--`This is the last lingering hope and I fear, tis a vain one.
Without waking him, she went back, and after a second dose of opium she fell towards morning into a heavy, incomplete sleep, during which she never quite lost consciousness.
The fatal dose is taken from your husband's Wineglass.
In that case we may fairly hope that a repetition of the dose will lead, in a greater or lesser degree, to a repetition of the result.
I am, at this moment, exerting my intelligence (such as it is) in your service, under the influence of a dose of laudanum, some ten times larger than the dose Mr.
You may remember, under the influence of the second dose of opium, the place in which you hid the Diamond under the influence of the first.
However, the teen results point to a link between low medication doses and at least temporary academic gains, Evans says.
This European Phase 2 study compares three doses of double-blinded Proellex against open label Lucrin, a gonadotropin-releasing hormone (GnRH) agonist, for up to six months of treatment.
In order to ensure that the effects seen were not nonspecific responses to toxic high doses, the cells were exposed to low, relatively nontoxic doses of the metal compounds sodium arsenite, cadmium chloride, sodium dichromate, and nickel subsulfide for 4 hours.
In mice, very low doses of morphine combined with even lower doses of a drug that usually blocks morphine's effect can give greater pain relief than higher doses of morphine alone, according to a report in the January BRAIN RESEARCH.
To establish the MTD, sequential new cohorts of patients receive increasing doses of huN901-DM1 until dose-limiting toxicity is encountered.