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Lesson Summary

The following points summarize the main elements of this lesson:

• An operating system provides the interface between hardware and user.
• MS-DOS is one of the first operating systems and was, for a long time, widely accepted as the standard.
• MS-DOS has limitations, notably, the 1-MB barrier.
• Early versions of Windows were operating environments that ran on top of MS-DOS.
• There are three files that make up the core operating system of MS-DOS: IO.SYS, MSDOS.SYS, and COMMAND.COM.
• Windows has three modes: real mode, standard mode, and 386 enhanced mode.

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