DOS

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DOS

[dos]
abbreviation for disk operating system. A generic term describing an operating system loaded from disk devices, the hard drive in modern computers, when the system is started or rebooted.

DOS

Abbreviation for date of service.
References in periodicals archive ?
While the Norton Desktop for Windows now has several imitators, we've raised the bar once again with special DOS 6.
FireWall/Plus for DOS is certified by the National Computer Security Association (NCSA) and runs on DOS 6.