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MS-DOS is an operating system - a piece of software which looks after the running of your computer. It lets you create and keep track of files, run and link programs, and make use of peripheral devices (for example, printers and disk drives) attached to your computer.
Because your computer can run with one of several different operating systems (for example, MS-DOS, CP/M) the operating system is not built into the computer. Instead it is loaded from disk when the computer is started up.
Once the operating system has been loaded into the computer’s memory the disk from which it was loaded may be removed if required. The operating system needs to be reloaded only if part has been overwritten (when using very large programs, for example) or when the computer is restarted.
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Can your computer run with many different operating systems?
Yes, the computer can run with many different operating systems.
The computer can run with as one and several different operating systems.
Yes, the computer can run with several operating systems.
No, the computer can run with one of the several operating systems.
