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DOS (Disk Operating System)

a COMPUTER program which enables a computer to record and retrieve data from a rotating magnetic or vinyl disk. The most widely-used disk operating system is MSDOS, which is used on computers that are compatible with the IBM personal computer.
References in periodicals archive ?
Hence, VisiCalc did a poor job of adapting its product to the DOS operating system, allowing Lotus 1-2-3 to dominate; Lotus lagged in adjusting its product to the Macintosh operating system and to Windows, allowing Microsoft Excel to take over.
In a 32-bit world, many property managers continue toiling away on 8-bit programs desperately clinging to a near extinct DOS operating system.
DOS operating system -- standard 16-bit software environment for easy development.
Although more than 2,500 employees were using PCs every day to access the company's mainframe and network systems, only 150 of them had any type of antivirus measures in place - and most of those were outdated security programs that came as part of the computer's DOS operating system.
basics of Microsoft DOS operating system and Microsoft Windows 3.
And of those programming, nearly half again still program in the DOS operating system.