DOS

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DOS

Abbreviation for date of service.
References in periodicals archive ?
That means that DOS, the original Disk Operating System, is still there but is now firmly hidden to the average user.
Everything was "proprietary." If you bought a computer from Radio Shack, you also got their disk operating system (scornfully referred to in the trade as "Trash-80").
This includes mastering the disk operating system, the basics of the operating environment, and a relatively simple application such as a word processor or desk organizer.