Topic 2 Cdca2103
This document was uploaded by user and they confirmed that they have the permission to share it. If you are author or own the copyright of this book, please report to us by using this DMCA report form. Report DMCA
Overview
Download & View Topic 2 Cdca2103 as PDF for free.
More details
- Words: 908
- Pages: 14
TOPIC 2 INTRODUCTION TO OPERATING SYSTEM Prepared by: Mrs Rohani Hassan Tutor OUM October 2009
INTRODUCTION
The most important type of system is the operating system (OS).
Three main responsibilities of an OS are:
11/08/09
Performing basic tasks such as recognizing input from keyboard Ensuring the different programs and users running at the same time do not interfere with each other Providing a software platform on top of which other programs or application software can run
Prepared by Rohani Hassan
2
2.1 THE CONCEPT OF OPERATING SYSTEM
There are 2 types of software – application software and system software Application software is the software used specifically to solve a particular problem. System software is the software used to support the use of the computer system The operating system falls under the category of system software. The main function of this software is:
11/08/09
To manage the computer system To interact with the user and perform the specific tasks To enable user to use computer with ease and comfort.
Prepared by Rohani Hassan
3
2.2
The function of an operating system is responsible for:
11/08/09
THE FUNCTION OF AN OPERATING SYSTEM
Providing user interface Managing the operating system components for optimum use Providing safety measures Providing control for the occurrence of unexpected incidents
Prepared by Rohani Hassan
4
2.2.1 Providing User Interface
User interface is a mechanism that allows users to interact with any software. For instance, an operating system provides a graphic interface that uses windows.
Beside using Windows, some operating systems use the following interface concept:
11/08/09
Command driven interface – requires users to type commands Menu driven interface – requires users to choose numbers in the menu
Prepared by Rohani Hassan
5
2.2.2 Managing the Computer System Components
11/08/09
A computer system consists of several components. Each component has its own use or importance. OS is responsible for managing all components to enables all the components to be effectively and efficiently used OS is responsible for inserting a program into the appropriate memory space and then taking it out when the program implementation is complete. OS is responsible for spooling concept that are used in the printer system. OS is responsible for handling another resource known as virtual resource like file system.
Prepared by Rohani Hassan
6
2.2.3 System Safety
A computer system frequently faces safety problem.
The most critical safety issue is related to the file system.
There are several safety issues faced by the particular computer system. Among them are:
11/08/09
To avoid stored information from being accessed or changed by people who have no right to access them To avoid the information store from being erased or deleted unintentionally.
Prepared by Rohani Hassan
7
2.2.4 Control of Unexpected Occurrences
The implementation of a program can lead to unforeseen occurrences such as:
11/08/09
The program tries to carry out instructions that do not exist. The program tries to carry out instructions that involve divided-by-zero calculations.
If these incidents are not controlled, the computer system will stop immediately. This situation is termed crash. This phenomenon is frustrating to users.
Prepared by Rohani Hassan
8
2.3
There are 4 types of an operating systems:
11/08/09
TYPES OF OPERATING SYSTEMS
Single User Operating System Multi User Operating System Multi Processor Operating System Network Operating System
Prepared by Rohani Hassan
9
2.3.1 Single User Operating System
A single user operating system is used for a desktop or notebook. This system allows only one user to use the computer at a given time an it has only one processor for operations. Example of this OS:
11/08/09
DOS Windows 95 Windows NT Mac OS OS/2 Pocket Pc Palm Top
Prepared by Rohani Hassan
10
2.3.2 Multi-User Operating System
11/08/09
This types of system allows many users to share the same processor at any one time It is widely used for big computers such as minicomputers or mainframe computers, which are always connected to several terminals. Users who use the terminal share the same computer system. In other words, the multi-user OS allows one computer system to be shared by several users at the same time.
Prepared by Rohani Hassan
11
2.3.3
11/08/09
Multi-Processor Operating System
Currently many computer have more than one processor to perform tasks more efficiently. For these various processor to work effectively, we require a special OS which is called the multi-processor operating system.
Prepared by Rohani Hassan
12
2.3.4 Network Operating System
The network OS is responsible for operating several computers in a local area network which usually comprises of several microcomputers. The main function of the network operating system is to allow computers to share resources such as printer and file server. Two example of a network OS are:
11/08/09
Novell Netware Windows NT
Prepared by Rohani Hassan
13
SUMMARY
11/08/09
The OS allows user to use the computer system efficiently and effectively
OS is also the backbone of a computer in managing the internal resources of the computer
The main objective of an OS is enable users to use the computer with ease and comfort.
Prepared by Rohani Hassan
14
INTRODUCTION
The most important type of system is the operating system (OS).
Three main responsibilities of an OS are:
11/08/09
Performing basic tasks such as recognizing input from keyboard Ensuring the different programs and users running at the same time do not interfere with each other Providing a software platform on top of which other programs or application software can run
Prepared by Rohani Hassan
2
2.1 THE CONCEPT OF OPERATING SYSTEM
There are 2 types of software – application software and system software Application software is the software used specifically to solve a particular problem. System software is the software used to support the use of the computer system The operating system falls under the category of system software. The main function of this software is:
11/08/09
To manage the computer system To interact with the user and perform the specific tasks To enable user to use computer with ease and comfort.
Prepared by Rohani Hassan
3
2.2
The function of an operating system is responsible for:
11/08/09
THE FUNCTION OF AN OPERATING SYSTEM
Providing user interface Managing the operating system components for optimum use Providing safety measures Providing control for the occurrence of unexpected incidents
Prepared by Rohani Hassan
4
2.2.1 Providing User Interface
User interface is a mechanism that allows users to interact with any software. For instance, an operating system provides a graphic interface that uses windows.
Beside using Windows, some operating systems use the following interface concept:
11/08/09
Command driven interface – requires users to type commands Menu driven interface – requires users to choose numbers in the menu
Prepared by Rohani Hassan
5
2.2.2 Managing the Computer System Components
11/08/09
A computer system consists of several components. Each component has its own use or importance. OS is responsible for managing all components to enables all the components to be effectively and efficiently used OS is responsible for inserting a program into the appropriate memory space and then taking it out when the program implementation is complete. OS is responsible for spooling concept that are used in the printer system. OS is responsible for handling another resource known as virtual resource like file system.
Prepared by Rohani Hassan
6
2.2.3 System Safety
A computer system frequently faces safety problem.
The most critical safety issue is related to the file system.
There are several safety issues faced by the particular computer system. Among them are:
11/08/09
To avoid stored information from being accessed or changed by people who have no right to access them To avoid the information store from being erased or deleted unintentionally.
Prepared by Rohani Hassan
7
2.2.4 Control of Unexpected Occurrences
The implementation of a program can lead to unforeseen occurrences such as:
11/08/09
The program tries to carry out instructions that do not exist. The program tries to carry out instructions that involve divided-by-zero calculations.
If these incidents are not controlled, the computer system will stop immediately. This situation is termed crash. This phenomenon is frustrating to users.
Prepared by Rohani Hassan
8
2.3
There are 4 types of an operating systems:
11/08/09
TYPES OF OPERATING SYSTEMS
Single User Operating System Multi User Operating System Multi Processor Operating System Network Operating System
Prepared by Rohani Hassan
9
2.3.1 Single User Operating System
A single user operating system is used for a desktop or notebook. This system allows only one user to use the computer at a given time an it has only one processor for operations. Example of this OS:
11/08/09
DOS Windows 95 Windows NT Mac OS OS/2 Pocket Pc Palm Top
Prepared by Rohani Hassan
10
2.3.2 Multi-User Operating System
11/08/09
This types of system allows many users to share the same processor at any one time It is widely used for big computers such as minicomputers or mainframe computers, which are always connected to several terminals. Users who use the terminal share the same computer system. In other words, the multi-user OS allows one computer system to be shared by several users at the same time.
Prepared by Rohani Hassan
11
2.3.3
11/08/09
Multi-Processor Operating System
Currently many computer have more than one processor to perform tasks more efficiently. For these various processor to work effectively, we require a special OS which is called the multi-processor operating system.
Prepared by Rohani Hassan
12
2.3.4 Network Operating System
The network OS is responsible for operating several computers in a local area network which usually comprises of several microcomputers. The main function of the network operating system is to allow computers to share resources such as printer and file server. Two example of a network OS are:
11/08/09
Novell Netware Windows NT
Prepared by Rohani Hassan
13
SUMMARY
11/08/09
The OS allows user to use the computer system efficiently and effectively
OS is also the backbone of a computer in managing the internal resources of the computer
The main objective of an OS is enable users to use the computer with ease and comfort.
Prepared by Rohani Hassan
14
Related Documents
Topic 2 Cdca2103
June 2020 0
Topic 2
November 2019 19
Topic 2
November 2019 15
Term 2 Topic 2
May 2020 8
Topic
May 2020 24
Topic
June 2020 17More Documents from ""