1. Introduction To Computer System
Module 1
Introduction To Computer System

2. Module 1 Objectives At the end of the lesson, you should be able to :
Identify the basic concept and usage of a computer
Identify the basic component of a computer
Discuss the advantages and disadvantages of computers
Recognize the purpose of network and the use of internet and network
Differentiate between system software and application software
Describe the categories of computers

3. Computer What is computer literacy?
Knowledge of computers and their uses
Computers are everywhere

4. What is a computer? How is a computer defined?
It is an electronic device operating under the controls of instruction stored in its memory.

5. What Is Computer ? The information processing cycle consist the below:
Input
Process
Output
Storage
Communication

6. Information Processing Cycle
Communication
Input: Accepting data that has been represented in a way that the computer can use.
Processing: Performing arithmetic or comparison (logical) operations on the represented data.
Output: Displaying results
Storage: Storing results for later reuse.
Communication: Transferring data to from one point to another

7. Computer System Components
Input devices
Output devices
System unit

8. Input devices
Hardware used to enter data and instructions

9. Output devices
Hardware that is used to convey messages to one or more people

10. System Unit
Case containing electronic components used to process data

11. Motherboard Central Processing Unit Memory Also called the processor
The electronic component that interprets and carries out the basic instructions that operate the computer
Memory
Consists of electronic components that store instructions waiting to be executed and data needed by those instructions
Intel Itanium 2© Processor

12. Storage
Storage
Holds data, instruction and information for future use.
Storage media
Physical material on which data, instructions and information is stored.
Storage device
Records and retrieves items to
and from storage devices

13. Communication Devices
Hardware component that enables a computer to send and receive data, instructions and information.
Occurs over cables, telephone lines, cellular radio networks and other transmission media.

14. Advantages of using a computer
Speed
Reliability
Consistency
Storage
Communications

15. Disadvantages of using Computers
Violation of privacy
Impact on labor force
Health risk
Impact on environment

16. Networks and the Internet
What is a network?
Network is a collection of computers and devices connected together

17. Networks and the Internet
Reasons for network

18. Networks and the Internet
Generally, a network uses a client server architecture
Servers manages
resources on a
network
Client access the
resources from the
server.
Networks and the Internet

19. Networks and the Internet
What is Internet?
Internet is a world wide collection of networks that connects millions of businesses, government agencies, educational institutions and individuals.

20. Networks and the Internet
Users access the internet for :
Communications
Information
Shopping
Banking and Investing
Classes
Entertainment

21. Networks and the Internet
What is The WWW (World Wide Web)?
consist of billions of documents, called web pages, available to anyone connected to the Internet.

22. What is Software ? Series of instructions that process data Two kinds
System software
Used by the computer
Application software
Used by the user
A computer system requires software to make the best use of its capabilities and to solve problems

23. What is System Software ?
Enables application software to interact with computer hardware
A “Background” software  manage internal computer resources and coordinate the application software requests with computer hardware without user interaction
Operating system software
Most important system software
Executes application software
Stores data and programs
manages all the overall operation of the computer system
I.e.  Eg. Window 2000, Linux, UNIX, Sun Solaris, Mac OS X

24. What is Application Software ?
End-user software  enter commands and typically interact with application programs.
General-purpose programs
Some types: Browsers, Spreadsheet, Database management systems, presentation graphics, word processor
i.e  Internet Explorer, Microsoft Word, PowerPoint
Special-purpose programs
Custom written for specialized tasks
written for an organization’s or business type’s specific purpose
i.e.  Online Registration System

25. Graphical User Interface (GUI)
What is a graphical user interface?
Allows you to interact with the software using graphics and icon.
Controls how you enter data and how the screen displays information.

26. Install and run software

27. Categories of Computers
Desktop
Mobile computers and mobile devices
Midrange servers
Mainframes
Supercomputers
Embedded computers

28. Further Reading
H.L. Capron, J.A. Johnson. Computers: Tools for an Information Age. Seventh Edition. Prentice-Hall. -- Chap 1
Ron White. How Computers Work. Millennium Edition. QUE. -- Chap 1
Larry Long, Nancy Long. Computers. 8th Edition. Prentice-Hall. -- Chap 1