1 What is Computer? A computer is a machine that can be programmed to process data (input) into useful information (output). A computer system comprises four main aspects of data handling: input, processing, output and storage.

2 The Nature of Computers Speed – essential to our fast-paced society Reliability – extremely reliable / human errors Storage Capability – tremendous amounts of data Productivity – doing better and faster jobs Decision Making – need to take into account financial, geographical and logistical factors Cost Reduction – holds down teh costs of labor, energy and paperwork

3 Education Graphics Retailing Energy – to locate oil, natural gas, coal Law Enforcement – fingerprint, DNA Transportation – car technologies, air traffic Money Agriculture Government Home Healt and Medicine Robotics The Human Connection The Sciences Connectivity Training Where Computers Are Used?

4 Computer System Memory Central processing unit (CPU) Input Disk Auxiliary Storage Disk Output

5 Front of the Computer CD-ROM Drive Floppy Drive Keyboard Monitor Mouse

6 Inside the Computer CD-ROM CPU Expansion Slots Floppy drive Hard disk Memory chip Motherboard Power Supply

7 Back of the Computer Cooling Fan Power Supply Keyboard Connector Mouse Connector Parallel Printer Port Video Connector Mouse Connector Parallel Printer Port Video Connector

8 Microprocessor Brain of the computer Current chips for PC –Intel (Celeron, Pentium III, Pentium IV and Centrino, Core 2 Duo) –AMD (K-6, Athlon, Sempron) Which do I buy? –Core 2 Duo or Sempron for graphic intensive programs –K-6 or Celeron for business and Internet browsing

9 CD-ROM Tape Backup Hard disk Zip Drive Floppy Disks DVD Auxiliary Storage

10 Auxiliary Storage (Permanent) Floppy Disk –Most common is 1.44Mb –LS-120 disk is 120Mb High Capacity Removable Storage –Zip disks (100 or 250Mb) –Jaz Disks (1 or 2Gb) Hard (Fixed) Disk –Most common are 80 Gb – 1 Tb

11 Auxiliary Storage (Continued) CD-ROM ( 800Mb) –Recordable devices also available DVD drives (4.7Gb-17Gb) –ROM and RAM –Higher capacity than CD Tape Units –Used for large, unattended back-ups

12 Internal Memory (RAM) Temporary (erased when power turned off) Measured in bytes – 1 Byte = 1 character (8 bits) – 1 Kilobyte = 2 10 (~1,000 bytes) – 1 Megabyte = 2 20 (~1,000,000 bytes) – 1 Gigabyte = 2 30 (~1,000,000,000 bytes) Need 1024Mb – 4096 Mb of RAM –Want to keep multiple programs & data files in memory – Graphic intensive programs demand a lot of memory

13 Input and Output Units Keyboard Mouse Trackball Scanner Joystick Pen Monitor Printers –Ink Jet B/W or color Smears –Lasers Highest quality output

14 Modems/Network Cards Fax/Modem –56Kbps/V.90 Cable Modem –Uses TV cable DSL Modem –Voice and Data on same line Network Cards

15 Additional Devices Multimedia –CD ROM or DVD –Sound Card –Speakers Other Devices –Scanner –Camera

16 Software System –MS-DOS –Mac OS –Unix –Linux –Windows Application –Word Processing –Spreadsheets –Presentation –Games –Antivirus –Others

17 Classification of Computers Personal Computers Notebook Computers – lightweight and portable Handheld Computers – personal digital assistant (PDA) Midrange Computers – design to serve the needs of medium sized organizations Mainframes – processing data at very high speed Supercomputers – process trillions of instructions per second

18 Introduction to Windows

19 Evolution of Windows Windows 3.1 –First widely used successful version of Windows –Replaced MS-DOS Windows 95 –Introduced Start button, taskbar for multitasking, and My Computer for easier file management Windows NT –Intended for business computing –Increased reliability and security

20 Evolution of Windows (Continued) Windows 98 –Active desktop displays Web content –Enables Web conventions on the desktop Windows 2000 –Security of NT with Windows 98 Interface –Windows 2000 Professional and Windows 2000 Server Windows Me (Millennium Edition) –Successor to Windows 98 for home computing

21 The Windows Desktop Start Button Taskbar (multitasking) My Computer

22 Anatomy of a Window Title bar with Min, Max or Restore, and Close buttons Menu bar, Toolbar, and Address bar Status bar and Scroll bars

23 The Devices on a System Drive A is always a floppy disk Drive B is a second floppy disk (obsolete) Drive C is always a fixed disk Drives D, E, are variable –CD ROM –Zip drive or removable media –Network drives

24 Pull-down Menus Pull-down menu Dimmed command Ellipsis Check Bullet Arrowhead Submenu

25 Dialog Boxes Tabbed dialog box Option buttons Check box Text box Spin button Command buttons

26 Dialog Boxes continued Command buttons Open List Box Scroll bar List box Tabbed dialog box Help button ? Cancel button OK button

27 Moving and Sizing a Window To Move a Window –Click and drag the title bar To Size a Window –Click and drag a corner to change the length and width in proportion with one another –Click and drag a border to change just the length or the width

28 Formatting a Floppy Disk capacity –720Kb –1.44Mb Types of formatting –Quick (erase) –Full Label

29 File Management My Computer –Simpler and less sophisticated –Can result in multiple open windows at one time Windows Explorer –Hierarchical view on left –Contents of the selected folder on the right Multiple views available for both –Small icons, Large icons, List, and Details view

30 Windows Explorer Folder –Expanded –Collapsed Files –Program file –Data file File names –Name –Extension (type)

31 Moving and Copying Files Moving Files –Click and drag to a different folder on the same drive –Cut and Paste –Shortcut Menu Copying Files –Click and drag from one drive to another –Copy and Paste –Shortcut Menu

32 The Help Command Accessed from the Start button Tabs –Contents tab –Index tab –Search tab –Favorites tab Web help