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Need for Operating System & Types of Operating System
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Objective
On completion of this period, you would be able On completion of this period, you would be able to knowto know
What is operating systemWhat is operating system
Need for operating systemNeed for operating system
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Prerequisite
What is the abbreviation of OS and DOS
OS stands for Operating System
DOS stands for Disk Operating System
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What is operating system?
Operating system is a system program used to coordinate and control various devices and programs in order to work with computer machine
Examples
Windows 95
Windows NT
UNIX
DOS
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Operating system
The operating system is a collection of programs used to operate a computer system
It takes the responsibility of computer’s overall operation and supervision
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Operating System (contd)
It coordinates among various devices and programs, and provides an interface between a programmer and the computer system
OS is popularly used for the abbreviation of the operating system
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Operating system (contd)
Now, from the fastest supercomputer and largest mainframe, right down to the smallest embedded microprocessor, every computer uses an operating system
Over the years, a variety of operating systems have evolved and many remain in use
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Operating system (contd)
DOS became the most widely used microcomputer operating system
Today, DOS has been replaced on many computers by more powerful operating systems such as Windows, UNIX, Windows NT and OS/2
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Operating System (contd)
More powerful operating systems make it possible to run tasks on less expensive microcomputers
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Types of Operating System
According to number of usersSingle User Operating Systems
Multi User Operating Systems
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Single user & Multi user Operating Systems
Only one user can work at a time on a computer system with a single user operating system
More than one user can work at a time on a computer system with a multi user operating system
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Some popular Operating Systems used are
Single user operating system
Multi user operating system
OS/2
MS DOS
WINDOWS 95
WINDOWS 98
WINDOWS ME
WINDOWS XP
WINDOWS 2000 professional
MACINTOSH OS
UNIX
VENIX
XENIX
LINEX
UNIXWARE7
WINDOWS NT
SUN SOLARIES
NOVEL NETWARE
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Operating System performs the following Functions
Managing and controlling the execution of a program
Transfer data between primary memory and auxiliary storage devices
Start up the computer and perform diagnostic tests of circuits and memory
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Operating System performs the following Functions (contd)
Accept commands entered at the keyboard that allow you to control the computer system
Managing peripheral devices
Transfer data and command to the printer
Managing files on external media
