1. Overview of Computer Systems Course: Introduction to Computers Course Code: CIT1101 Presented by: Bulbul Ah@med Week: 01

2. Bulbul Ahamed2June 11, 2016 Outline  Definition of Computer  Data Processing Cycle  Parts of a Computer System

3. June 11, 20163Bulbul Ahamed Definition of Computer  A Computer is an electronic device that can do 4 (four) tasks:  Accepts INPUT (data)  Processes DATA  Stores DATA  Produces OUTPUT  We call these 4 (four) tasks the: Data Processing Cycle

4. 4 Computers are Data Processing Devices Four major functions: – Input data – Process data – Output information – Store data and information DATA IN INFORMATION OUT

5. Processes (Data Processing) Input (Data) Output (Information) Memory/Storage June 11, 20165Bulbul Ahamed Data/Information Processing Cycle

6. 6June 11, 2016 Data  Data is anything in a form suitable for use with a computer.  The raw material from which information is generated. Data appear in the form of text, numbers, audio, video, images, figures, or any combination of these.  Data is measurement that can be disorganized.

7. Bulbul Ahamed7June 11, 2016 Data Processing  It’s a process that converts the data into information.  A general term that stands for all logical, arithmetic, and input/output operations that can be performed on data by a computer.

8. Bulbul Ahamed8June 11, 2016 Information  Information is the result of processing, manipulating and organizing data in a way that adds to the knowledge of the receiver.  Data becomes organized it becomes Information.

9. Data vs. Information 1200 100 79154 WestCharles Mann 79154TM Shoes Monthly Sales Report for West Region Sales Rep: Charles Mann Emp No. 79154 Item Qty Sold Price TM Shoes 1200 $100

10. Bulbul Ahamed10June 11, 2016 Storage  Data and information are stored/ maintained for later use.  Any type of information - words, figures, still or moving images, sound or music - can be stored into storage devices (e.g. HDD, CD, DVD) and that can be used at any time. Hard Disk Drive CD / DVD Drive Flash Drive

11. Bulbul Ahamed11June 11, 2016 Parts of a Computer System  Hardware  Software  Users  Data

12. Bulbul Ahamed12June 11, 2016 Hardware  The physical devices that make up the computer are called Hardware.  Any part of the Computer you can touch.  The term device refers to any piece of hardware System Unit Peripheral Devices

13. Monitor Keyboard Mouse Printer Speaker Computer Case (Processor inside) Floppy Disk Drive CD-ROM/DVD Drive Hardware (Cont…)

14. An inside view: the Motherboard Cards: Video, Sound Network, Modem Bulbul Ahamed14June 11, 2016

15. Bulbul Ahamed15June 11, 2016 Software  Software is a set of instructions that makes the computer perform tasks.  Software tells the Computer what to do.  The term program refers to any piece of software.  Examples: Operating Systems, Web browser, Word processors, Adobe Photoshop, Games etc.

16. Bulbul Ahamed16June 11, 2016 User & Data  People are the Computer operators, also known as users or Humanware.  The user is a person perhaps like yourself – someone without much technical knowledge of computers but who uses computers to perform professional or personal tasks, enhance learning, or have fun. Data:  See Slide No.08

17. Classify computers according to speed, cost, size, and complexity. Super Computers Mainframe Computers Minicomputers Microcomputer Palmtop Computer Fast Expensive Complex Large Slow Cheap Simple Small June 11, 201617Bulbul Ahamed Classifications of Computer

18.  Mainframes: A powerful multi-user computer capable of supporting many hundreds or thousands of users simultaneously.  Midrange computers/ Minicomputers: A multi-user computer capable of supporting from 10 to hundreds of users simultaneously. Less powerful, less expensive, and smaller than a mainframe. June 11, 201618Bulbul Ahamed Classifications of Computer …  Supercomputer: Highly sophisticated and powerful computer that can perform hundreds of millions of instructions per second.

19.  A desktop computer is a personal computer designed to fit entirely on or under a desk or table.  A laptop computer, also called a notebook computer, is a portable, personal computer designed to fit on your lap. June 11, 201619Bulbul Ahamed Classifications of Computer …  Microcomputer/ Personal Computer (PC): A small (desktop or portable), single-user computer based on a microprocessor.  Palmtop Computer : Small enough to fit in one hand.

20. Any Questions…? Bulbul Ahamed20June 11, 2016