An operating system is difficult to define, but has been called "the layer of software that manages a computer's resources for its users and their See more

Early computers were built to perform a series of single tasks, like a calculator. Basic operating system features were developed in the … See more

The components of an operating system all exist in order to make the different parts of a computer work together. All user software needs to go through the operating system in … See more

If an application is written for use on a specific operating system, and is ported to another OS, the functionality required by that application may be implemented differently by that OS … See more

Multicomputer operating systems
With multiprocessors multiple CPUs share memory. A multicomputer or cluster computer has … See more

Unix and Unix-like operating systems
Unix was originally written in assembly language. Ken Thompson wrote B, mainly based on BCPL, based on his experience in the MULTICS project. B was replaced by C, and Unix, rewritten in C, developed into a large, complex … See more

A hobby operating system may be classified as one whose code has not been directly derived from an existing operating system, … See more