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An operating system (OS) is a software program that manages the hardware and software resources of a computer. The OS performs basic tasks, such as controlling and allocating memory, prioritizing the processing of instructions, controlling input and output devices, facilitating networking, and managing files.

Introduction


Modern general-purpose computers, including personal computers and mainframes, have an operating system to run other programs, such as application software. Examples of operating systems for personal computers include Microsoft Windows, Linux, Mac OS (Darwin), and Unix.

The main advantages of an operating system include:

  1. Allows multiple programs to run concurrently.
  2. Simplifies the programming of application software because the program does not have to manage the hardware. The operating systems manages all hardware and the interaction of software. It also gives the program a high level interface to the hardware and ways of interacting with other programs.

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LispOS Info Page - Brief history, and link to mail list archive, begun April 1997, closed February 1999, by Richard Coleman (of ZSH), to coordinate efforts to make a free OS to return to users the power of Lisp Machines.

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