Operating System
A program that acts as an intermediary between
a user of a computer and the computer hardware.
An operating System is a collection of system
programs that together control the operations of a computer
system.
Some
examples of operating systems are UNIX, Mach, MS-DOS, MS-Windows, Windows/NT,
Chicago, OS/2, MacOS, VMS, MVS, and VM.
Operating
system goals:
•
Execute user programs and make solving user problems easier.
•
Make the computer system convenient to use.
•
Use the computer hardware in an efficient manner.
Computer
System Components
1.
Hardware – provides basic computing resources (CPU, memory, I/O
devices).
2.
Operating system – controls and coordinates the use of the hardware
among the various application
programs
for the various users.
3.
Applications programs – Define the ways in which the system resources
are used to solve the computing
problems
of the users (compilers, database systems, video games, business programs).
4.
Users (people, machines, other computers).
Abstract
View of System Components
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