1. computing ESSENTIALS     Copyright 2003 The McGraw-Hill Companies, Inc. 1 55 CHAPTER Input and Output computing ESSENTIALS    

2. Copyright 2003 The McGraw-Hill Companies, Inc. 2 Competencies Input devices Digitizing Output devices Multifunctional devices Telephony Terminals computing ESSENTIALS    

3. Copyright 2003 The McGraw-Hill Companies, Inc. 3 Input Data or instructions Directly from user From other sources Input device Hardware to provide input to computer computing ESSENTIALS    

4. Copyright 2003 The McGraw-Hill Companies, Inc. 4 Input Devices Keyboards Pointing devices Scanners Image capture devices Audio capture computing ESSENTIALS    

5. Copyright 2003 The McGraw-Hill Companies, Inc. 5 Keyboards Most common input device Characters, numbers, symbols converted to electrical signal Typewriter keyboard, numeric keypad, special keys Navigation keys Function keys Windows key computing ESSENTIALS    

6. Copyright 2003 The McGraw-Hill Companies, Inc. 6 Keyboards Toggle keys Turns a feature on or off Caps Lock Combination keys Held down in combination with another key Control key, Alt key computing ESSENTIALS    

7. Copyright 2003 The McGraw-Hill Companies, Inc. 7 Pointing Devices Control a pointer on the monitor Used to select buttons, menus, links Mouse Most common pointing device Mechanical Optical Wireless computing ESSENTIALS    

8. Copyright 2003 The McGraw-Hill Companies, Inc. 8 Pointing Devices Trackball Move roller ball with thumb Touch surface Move finger across surface of pad Tap to select Pointing stick Middle of keyboard Move with finger computing ESSENTIALS    

9. Copyright 2003 The McGraw-Hill Companies, Inc. 9 Pointing Devices Joystick Popular for computer games User grips stick to maneuver Touch screen Special monitor Screen layer with crisscrossed beams of infrared light Select by touching screen directly computing ESSENTIALS    

10. Copyright 2003 The McGraw-Hill Companies, Inc. 10 Scanning Devices Copy data from a source Types of scanners Optical scanner Bar code readers Character and Mark recognition computing ESSENTIALS    

11. Copyright 2003 The McGraw-Hill Companies, Inc. 11 Optical Scanners Copy text or images Can be displayed, printed, or stored Types of optical scanners Flatbed scanner Source placed on glass surface Image scanned from below Portable scanner Handheld device that slides across source computing ESSENTIALS    

12. Copyright 2003 The McGraw-Hill Companies, Inc. 12 Bar Code Readers Photoelectric scanner Read bar codes Alternating black & white vertical bars Universal Product Code (UPC) Seen in grocery stores, retail stores computing ESSENTIALS    

13. Copyright 2003 The McGraw-Hill Companies, Inc. 13 Character & Mark Recognition Magnetic-ink character recognition (MICR) Reads magnetically encoded characters Optical-character recognition (OCR) Reflects light off special preprinted characters Optical-mark recognition (OMR) Senses presence or absence of marks computing ESSENTIALS    

14. Copyright 2003 The McGraw-Hill Companies, Inc. 14 Image Capturing Devices Create or capture original images Digital camera Image recorded digitally to memory Digital video cameras Capture motion Webcams Capture images for broadcast on Internet computing ESSENTIALS    

15. Copyright 2003 The McGraw-Hill Companies, Inc. 15 Digitizing Devices Capture sketches, maps, drawings Flat surface, writing device Types Graphics tablets Special tablet, stylus Digital notebook Regular paper, pen computing ESSENTIALS    

16. Copyright 2003 The McGraw-Hill Companies, Inc. 16 Audio-Input Devices Convert sound into digital format Voice recognition system Operate computer by voice command Dictation Microphone, sound card, software Discrete Continuous computing ESSENTIALS    

17. Copyright 2003 The McGraw-Hill Companies, Inc. 17 Voice Recognition Systems Types Recognize individual words based on sound Discrete-speech recognition Cannot distinguish same-sound words Continuous-speech recognition Can distinguish same-sound words Evaluates context of words computing ESSENTIALS    

18. Copyright 2003 The McGraw-Hill Companies, Inc. 18 Output Processed data from a computer Text, graphics, photos, audio, video Common output devices Monitor Printer Plotter Voice computing ESSENTIALS    

19. Copyright 2003 The McGraw-Hill Companies, Inc. 19 Monitors Most frequently used output device Size is measured by diagonal of screen Common sizes: 15, 17, 19, 21 inches Clarity is indicated by resolution Measured in pixels More pixels = better clarity computing ESSENTIALS    

20. Copyright 2003 The McGraw-Hill Companies, Inc. 20 Monitor Standards Resolution capabilities indicated by a monitor’s standard Super Video Graphics Array (SVGA) Extended Graphics Array (XGA) Super Extended Graphics Array (SXGA) Ultra Extended Graphics Array (UXGA) computing ESSENTIALS    

21. Copyright 2003 The McGraw-Hill Companies, Inc. 21 Monitor Types Cathode-Ray Tubes (CRT) Most common Flat-panel monitors Passive-matrix Active-matrix eBook readers Data projectors High-definition television (HDTV) computing ESSENTIALS    

22. Copyright 2003 The McGraw-Hill Companies, Inc. 22 Printers Produces hard copy output Ink-jet printer Sprays droplets of ink Laser printer Laser produced images Thermal printer Heated element produce image on heat sensitive paper computing ESSENTIALS    

23. Copyright 2003 The McGraw-Hill Companies, Inc. 23 Other Printers Dot-matrix Series of pins on print head Inexpensive, not high quality Chain printer Used on networks Plotter Maps, architectural drawings High quality, larger sized output computing ESSENTIALS    

24. Copyright 2003 The McGraw-Hill Companies, Inc. 24 Audio Output Devices Translate computer data into understandable sounds MP3 files Components Sound card Speaker system or headphones computing ESSENTIALS    

25. Copyright 2003 The McGraw-Hill Companies, Inc. 25 Combination Input/Output Devices Devices are combined into one device Save room Specialized applications Fax machine Multifunctional device Telephony Terminals computing ESSENTIALS    

26. Copyright 2003 The McGraw-Hill Companies, Inc. 26 Fax Machine Facsimile transmission machine Sends and receives images across telephone lines Fax/modem board Give computer same capability computing ESSENTIALS    

27. Copyright 2003 The McGraw-Hill Companies, Inc. 27 Multifunctional Device Combines Scanner Printer Fax machine Copying machine Cost effective Saves space Popular in small offices or home computing ESSENTIALS    

28. Copyright 2003 The McGraw-Hill Companies, Inc. 28 Telephony Uses Internet rather than traditional communication lines Requires Internet telephone Internet Special service provider computing ESSENTIALS    

29. Copyright 2003 The McGraw-Hill Companies, Inc. 29 Terminals Devices connected to servers Input and output Types Dumb terminal Intelligent terminal Network terminal Internet terminal computing ESSENTIALS    

30. Copyright 2003 The McGraw-Hill Companies, Inc. 30 A Look to the Future Brain-machine interface Signal interceptor in brain translates into action on the computer Restore mobility to paralyzed Prosthetic limbs Virtual reality computing ESSENTIALS    