Chapter 2

In the end of the lesson, student should be able to..

Describe the main components of a computer system, hardware.

Provide examples of hardware device that handle input, output, motherboard and storage task.

differentiate type of input device and output device.

1) Introduction of computer What is computer?

A programmable machine. The two principal of characteristic of a computer are:

1)It responds to a specific set of instructions in a well-defined manner.

2)It can execute a prerecorded list of instructions (a program).

Evolution of computer(http://www.computerhistory.org/timeline/)

Type of computer Computers can be generally classified by size and power

as follows, though there is considerable overlap:

1) personal computer 2) minicomputer3) mainframe 4) supercomputer

Computer system

Collection of related component that have been designed to work together. Their perform four basic operations: input, output, processing and storage.

Overview of computer system

Input Output Process

Storage

What is input? Any data or

instructions you enter into the memory of the computer

Users can input data and instructions in a variety of ways.

Example (keyboard,mouse etc)

Input

Overview of computer system

Input Output Process

Storage

The execution of arithmetic or comparison operation on data.

The devices is motherboard:A large circuit board containing the computer central processing unit, support chips, random access memory, and expansion slots. Also called a main board.

Process

A “motherboard”

Expansion slots Pins to attach to motherboard

A RAM chip

Overview of computer system

Input Output Process

Storage

The result of processing information that enable people to see, hear, and even feel that result.

Example of device is: 1.monitor 2.printer 3.speaker/

earphone

Output

Overview of computer system

Input Output Process

Storage

Storage that the computer saves the result of processing to used again later.

Storage devices hold all of the program and data that the computer uses.

Example of devices is: a hard disk, a floppy disk, CD ROM or DVD ROM.

Storage

Activities

Activities..

Group 1. Present about the computer system.

Group 2. Present the differences of input devices and output devices.