History of the Operating System

The Sybex book I'm reading starts the operating systems section by looking at the history of the operating system. How Microsoft Windows and MS-DOS came into being and their evolution to what we use today. It also covers basic concepts of an OS and the origins of the early systems that would go on to influence every OS built afterwards.

The subject matter of this whole chapter is however not covered by the A+ exam nor is it mentioned in the A+ objectives. It is worth reading, but since this site is intended for revision notes I don't see any reason to include anything on this section here.