CIM101 Introduction to Computer Course Teacher : Kazi Saiful Alam(Rehan) Course credit : 3.0 Prerequisite : Nil 1

Course goal After completing the course, we will have clear concept on : – What is Computer? – Basic parts of a computer system(I/O device,CPU,...) – Hardware & Software and their classifications – Different types of hardware & software – Basic knowledge on the internet – Basic knowledge on the multimedia 8/28/2015 2

Recommended Text Introduction to Computers – ▫ Peter Norton, McGraw Hill, International Edition Computer Fundamentals – ▫Dr. M. Lutfar Rahman and Dr. Alamgir Hossain. The contents from other books will be presented depending on the requirements of the course. 8/28/2015 3

Lecture 1 Introduction to computer system 4

Objective After this lecture, students are going to know:  What is meant by ‘computer’  Why should we call it a system  Computer system units/major hardware classification  Characteristics  Work flow of a computer  Components of the system 8/28/2015 5

Different looks of computer 8/28/ Laptop Desktop

Computer system Monitor Speaker Keyboard Mouse System Unit

Elements

Inside System unit

8/28/

Computer System What do we understand by the word ‘computer’? – The modern definition of a computer is an electronic device that performs calculations on data, presenting the results to humans or other computers in a variety of (hopefully useful) ways and store it. – Not just a single machine but a combination of many devices and instructions to operate those devices. – The devices(Hardware) and the instructions(Software) all together make a computer. – So it is a system not just a device. 8/28/

Characteristics of a computer ▫Millions and billions times faster than human brain ▫Does not get tired ▫Does not produce wrong output unless there is something wrong with data or instruction set ▫ Limited memory ▫No independent thinking or reasoning 8/28/

Work flow 8/28/ Input Process Output Input data from disk, keyboard or other storage media Process data Output results to display screen, disk or other media

Components Basic components of a computer system are ▫Hardware ▫Software ▫Human ware 8/28/

Hardware Refers to machines or physical equipment that performs the basic functions of data processing. Example: Printer, Keyboard, Mouse etc. 8/28/

Computer System Units The generic computer contains ▫a computational unit ▫Input devices(keyboard,mouse). ▫Output devices(monitors, printers). The computational unit is the computer's heart, and usually consists of a central processing unit (CPU), a memory, and an input/output (I/O) interface. 8/28/

Software Computer programs Sets of instructions which directs a computer to perform certain function. Programs are referred to as software Software is of two types: System Software ( helps computer to perform tasks, e.g. Windows XP, Vista,Linux etc.) Application Software ( helps by performing user applications, Microsoft power point, windows media player etc.) 8/28/

Human ware Refers to the persons who design, program and operate a computer. Three principal positions: System analysts Defines the application problem Determines systems specifications Recommends hardware and software Designs information-processing procedures Programmer Prepare programs based on the specification made by systems analyst Computer operator Performs a series of well-defined tasks to keep the computer operating at maximum efficiency 8/28/

Question session Please feel free to ask any questions …….. Thank You 8/28/