1. Computer Concepts – Illustrated 8 th edition Unit B: Computer Hardware

2. Computer Concepts – Illustrated 8th Edition 2 Objectives Examine input devices Examine display devices Compare printers Introduce data storage systems Compare data storage systems Computer Concepts – Illustrated 8th Edition 2

3. 3 Objectives (continued) Examine optical storage Examine solid-state storage Expand your computer Computer Concepts – Illustrated 8th Edition 3

4. 4 Examining Input Devices Most keyboards are similar  Typing keypad: keys with letters, numbers  Navigation keypad Keys such as Home, End, arrow keys, etc. Can be used to move the insertion point (or cursor) on the screen Mouse  Used to control an on-screen pointer, etc.  Optical mouse  Laser mouse Computer Concepts – Illustrated 8th Edition 4

5. 5 5 Figure B-1: Keyboard examples

6. Computer Concepts – Illustrated 8th Edition 6 Examining Input Devices (continued) Other pointing devices:  Pointing stick  Touchpad (also called a trackpad)  Trackball Other ways to input data:  Touch screen  Scanner  Microphone  Digital camera

7. Computer Concepts – Illustrated 8th Edition 7 Examining Display Devices CRT (cathode ray tube) monitors  Typically not sold with new computer systems anymore Technologies commonly used for computer display devices today:  LCD (liquid crystal display) screens Found with desktop computers and notebook computers Also called flat-panel displays  OLED (organic light emitting diodes) Used by most handheld devices

8. Computer Concepts – Illustrated 8th Edition 8 Figure B-6: Examples of monitors

9. Computer Concepts – Illustrated 8th Edition 9 Examining Display Devices (continued) Graphics card  Contains circuitry that generates the signals for displaying an image on the screen  Response rate How fast a screen updates the information being displayed  Resolution Maximum number of horizontal and vertical pixels that are displayed  Pixel (picture element) A single point or the smallest unit in a graphic image

10. Computer Concepts – Illustrated 8th Edition 10 Examining Display Devices (continued) Screen size  Measurement in inches from one corner diagonally across to the opposite corner Dot pitch (dp)  A measure of image clarity Color depth or bit depth  Number of colors that a monitor and graphics card can display A computer monitor can be used to watch TV

11. Computer Concepts – Illustrated 8th Edition 11 Comparing Printers Ink-jet printer  Small, lightweight, inexpensive  Produces very good-quality color output  Ink cartridges can be expensive Laser printer  Used in situations which require high- volume output or good-quality printouts  Require toner cartridge refills or replacements

12. Computer Concepts – Illustrated 8th Edition 12 Figure B-9: An ink jet printer Figure B-10: A laser printer

13. Computer Concepts – Illustrated 8th Edition 13 Comparing Printers (continued) Printer resolution  Determines the quality of printed output  Measured in dots per inch (or dpi) Printer speed  Pages per minute (ppm) Options for connecting printer to computer:  USB port, serial port, parallel port, or network port Network-enabled printer Photo printer

14. Computer Concepts – Illustrated 8th Edition 14 Introducing Data Storage Systems RAM (random access memory)  Used to store data temporarily A data storage system is made up of:  Storage medium Hard drive, tape, memory card, flash drive, CD, DVD, etc. Holds data  Storage device Equipment that stores and retrieves data from its storage medium

15. Computer Concepts – Illustrated 8th Edition 15 Figure B-12: Examples of storage media and storage devices

16. Computer Concepts – Illustrated 8th Edition 16 Introducing Data Storage Systems (continued) Hard drives  Preferred type of main storage for most computer systems Additional storage devices used with computers:  CD/DVD/BD drives  USB flash drives  Solid-state drives  Solid-state card readers

17. Computer Concepts – Illustrated 8th Edition 17 Comparing Data Storage Systems Random access (also called direct access)  Can jump directly to the requested data Sequential access  Reads through data from the beginning to the end Magnetic storage  Stores data by magnetizing microscopic particles on the disk or tape surface  Hard drives and tapes

18. Computer Concepts – Illustrated 8th Edition 18 Figure B-15: Magnetic storage

19. Computer Concepts – Illustrated 8th Edition 19 Comparing Data Storage Systems (continued) Optical storage  Stores data as microscopic light and dark spots on the disc surface  CDs, DVDs, and BDs Solid-state storage  Stores data in a nonvolatile, erasable, low- power chip  Some hard drives, compact storage cards, thumb drives, flash drives, memory sticks

20. Computer Concepts – Illustrated 8th Edition 20 Figure B-16: Optical storage

21. Computer Concepts – Illustrated 8th Edition 21 Examining Optical Storage CD-ROM means read-only technology  Also true for DVD-ROM, BD-ROM discs CD-R means CD recordable technology  Also true for DVD-R/DVD+R, BD-R discs CD-RW means CD rewritable technology  Also true for DVD-RW/DVD+RW, BD-RE discs A computer system can have a CD drive, DVD drive, or BD drive

22. Computer Concepts – Illustrated 8th Edition 22 Figure B-19: How an optical drive works

23. Computer Concepts – Illustrated 8th Edition 23 Examining Solid-State Storage Solid-state storage technology  Stores data in a nonvolatile, erasable, low- power chip  Used in digital cameras, MP3 players, etc., or for transporting data Wide range of solid-state memory cards:  CompactFlash (CF) cards  MultiMedia cards (MMC)  SecureDigital (SD) cards

24. Computer Concepts – Illustrated 8th Edition 24 Figure B-20: Solid state cards Figure B-22: Examples of solid-state drives

25. Computer Concepts – Illustrated 8th Edition 25 Examining Solid-State Storage (continued) Card reader  Required to transfer data to or from a computer using solid-state storage cards USB flash drives and solid-state drives (SSD)  Incorporate the memory and the reader into one device USB flash drives  Easily transportable from one computer to another

26. Computer Concepts – Illustrated 8th Edition 26 Expanding Your Computer Expansion port  A connector that passes data between a computer and a peripheral device Expansion card  A small circuit board that makes it possible for the computer to communicate with a peripheral device Expansion bus  Segment of the data bus between RAM and the peripheral devices

27. Computer Concepts – Illustrated 8th Edition 27 Figure B-23: Common Expansion ports

28. Computer Concepts – Illustrated 8th Edition 28 Expanding Your Computer (continued) Expansion slot  Long, narrow socket on the motherboard into which you can plug an expansion card Device driver  Sets up communication between the computer and a peripheral device or expansion card USB (universal serial bus) port  Used for connecting many peripheral devices

29. Computer Concepts – Illustrated 8th Edition 29 Talking Points: Why Recycle Computers? U.S. landfills already hold more than 2 million tons of computer parts  Computer parts contain toxic substances, such as lead, phosphorus, and mercury Better options for disposing of computers:  Sell it, donate it, recycle it, or send it back to the manufacturer About half the states in the U.S. have taken legislative action to deal with the problem

30. Computer Concepts – Illustrated 8th Edition 30 Summary This chapter introduced:  Components of the computer hardware  Computer storage systems  Expanding the computer hardware you use with a computer  Disposing of computer hardware in an environmentally friendly way Computer Concepts – Illustrated 8th Edition 30