ENVS 1500 Lecture 13: ENVS 1500 Lecture 13 Notes
13 May 2018
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ENVS 1500 Lecture 13 Notes – The operating systems concept: an introduction
Introduction
• The barebones computer is not capable of using the CPU productively during these
intervals.
• Behind these considerations is the realization that ultimately the purpose of the
computer is to help the user to get work done.
• Obviously, modern computers are not meant to be operated in a barebones fashion like
the Little Man.
• The user should be able to start and operate the computer easily
• Should be able to choose programs to load and execute
• Should be able to communicate with others users and other systems
• Should be able to perform these operations in a convenient, flexible, and efficient
manner
• Larger computer systems should be able to share the resources among many users.
• What are required are additional programs that can provide services to make these
expanded capabilities possible.
• The solution to the limitations of a barebones system is to include programs with the
computer system that will accept commands from the user and that will provide desired
servies to the user ad to the user’s progras.
• These included programs are known collectively as an operating system.
• The operating system acts as a system manager, controlling both hardware and
software and acting as an interface between the user and the system.
• The operating system itself consists of a collection of programs that work together
collectively to accomplish these tasks.
• An operating system may be defined as a collection of computer programs that
integrate the hardware resources of the computer
• Make those resoures availale to a user ad the user’s progras
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