1 / 40

Chapter Three

Chapter Three. Hardware Basics: Peripherals. Input Devices Output Devices Storage Devices Computer Systems: The Sum of Its Parts. Chapter Outline. Input: From Person to Processor. Person. Processor. Input Device. The Omnipresent Keyboard.

xander
Download Presentation

Chapter Three

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter Three Hardware Basics: Peripherals

  2. Input Devices Output Devices Storage Devices Computer Systems: The Sum of Its Parts Chapter Outline  1999 Addison Wesley Longman

  3. Input: From Person to Processor Person Processor Input Device  1999 Addison Wesley Longman

  4. The Omnipresent Keyboard • Do you know where these keys are located on the keyboard and how to use them? • Letters, Numbers, Cursor Keys, Delete Key, Enter (Return) Key, and Function Keys  1999 Addison Wesley Longman

  5. Pointing Devices Mouse TouchScreen Joystick GraphicsTablet Trackball  1999 Addison Wesley Longman

  6. Reading Tools • Optical-mark readers • Bar-code readers • Magnetic-ink character readers • Wand readers  1999 Addison Wesley Longman

  7. Digitizing the Real World Videodigitizing Hand-held Scanner Audio digitizing Flatbed Scanner  1999 Addison Wesley Longman

  8. Audio Digitizers Audio digitizers contain circuitry to digitize sounds from microphones and other audio devices.  1999 Addison Wesley Longman

  9. Video Digitizers Video digitizers contain circuitry to digitize frames from camcorders and other video sources.  1999 Addison Wesley Longman

  10. Scanners Scanners capture and digitize images from external paper sources.  1999 Addison Wesley Longman

  11. Output: From Pulses to People Paper Video Monitor Sound Controlling Other Machines  1999 Addison Wesley Longman

  12. Digital Cameras Digital cameras turn real-world scenes into digital images that can be stored and manipulated by the computer. The images, stored in memory, can be transferred to a computer for either editing or storage.  1999 Addison Wesley Longman

  13. Screen Output • Video Monitor • Also called Video Display Terminal (VDT) • Image exists in video memory—VRAM • Monitor size is measured diagonally across the screen  1999 Addison Wesley Longman

  14. Pixels • Images are made up ofdots called pixels forpicture elements • The number of pixelsaffects the resolutionof the monitor • The higher the resolution,the better the image quality  1999 Addison Wesley Longman

  15. Raster Graphics • arrangement of pixels into rows & columns • character mode (25*80) • graphics mode (350*720) • higher resolution (600*800, 768*1024)  1999 Addison Wesley Longman

  16. Color Depth (Pixel Depth) • The amount of information per pixel is known as the color depth • Monochrome (1 bit of information per pixel) • Gray-scale (8 bits of information per pixel) • Color (8 or 16 bits of information per pixel) • True color (24 or 32 bits of information per pixel)  1999 Addison Wesley Longman

  17. Examples of Color Depth 4-bit depth 1-bit depth 8-bit depth 16-bit depth  1999 Addison Wesley Longman

  18. Classes of Monitors CRT (cathode ray tube) LCD (liquid crystal display)  1999 Addison Wesley Longman

  19. CRT (Cathode Ray Tube) • A CRT is a television-style monitor • Its features include: • Clear image • Quick response time • Low cost • Very popular  1999 Addison Wesley Longman

  20. LCD (Liquid Crystal Display) • LCDs comprise flat-panel monitors • Features of flat-panel monitors include: • Lighter weight • More compact • More expensive • Dominate the portablecomputer market  1999 Addison Wesley Longman

  21. Characters • letters (5*7 dot matrix) • Chinese characters • 16 * 16 （可辨認） • 24 * 24 （清晰） • 32 * 32 ... • 64 * 64 （美觀）  1999 Addison Wesley Longman

  22. Paper Output • Paper output is sometimes called hard copy • Hard copy can come from one of two kinds of printers: • Impact printers • Non-impact printers  1999 Addison Wesley Longman

  23. Printer • impact printers - noisy, non-graphic • character printer • line printer • dot matrix printer • non-impact printers • thermal-wax-transfer printer • ink-jet printer • laser printer  1999 Addison Wesley Longman

  24. Impact Printers • Line printers • Used by mainframes formassive jobs • Limited characters available • Dot-matrix printers • Image formed from dots printed on paper • Good for text and graphics • Inexpensive  1999 Addison Wesley Longman

  25. Non-impact Printers • Laser printers • Image transferred to paper with laser beam • Faster and more expensivethan dot-matrix • High-resolution hard copy  1999 Addison Wesley Longman

  26. Non-impact Printers • Ink-jet • Dots of ink are sprayed onto the paper to form the image • High-resolution hard copy • Some models printcan print colorphotographs  1999 Addison Wesley Longman

  27. Other Non-impact Printers • Plotters • Image transferred to paper with ink pens • Very high resolution • Excellent for scientific and engineering applications  1999 Addison Wesley Longman

  28. Output You Can Hear • Synthesizers can beused to generate music and sounds • Many computershave synthesizers • Sound cards havebuilt-in synthesizers  1999 Addison Wesley Longman

  29. Machines Controlling Other Machines • By turning bit information into movements (robots) or measurements (sensors), machines can control other machines: • Automated factory equipment • Telephone switchboards • Robot arms • Spacecraft  1999 Addison Wesley Longman

  30. Secondary Storage:Input and Output • Peripherals with both input and output functions. This form of storage is semi-permanent • Examples include: • Magnetic tape • Magnetic disks • Optical disks  1999 Addison Wesley Longman

  31. Magnetic Tape • Magnetic tape is a common form of storage for mainframe computers. • Information is accessedsequentially • Massive storage for lowcost but retrieval is slow  1999 Addison Wesley Longman

  32. Magnetic Tape • backup storage • 7 or 9 tracks • 2400 ft • 800, 1600, 6400 bpi • blocked • 70GB, 200GB  1999 Addison Wesley Longman

  33. Hard Disks Magnetic Disks Floppy Disk Zip Disks and Zip Drive  1999 Addison Wesley Longman

  34. Magnetic Disk • semi-random access • access time • seek time • latency time • data transfer time  1999 Addison Wesley Longman

  35. Hard Disks • Hard disks are: • Rigid, magnetically sensitive metal disks. • Designed so that information can be randomly accessed • Designed for large storage capacity • Able to access data quickly • Not removable from the drive  1999 Addison Wesley Longman

  36. Diskettes • Diskettes are: • Flexible, magnetically sensitive plastic disks • Information can be randomly accessed. • Has limited storage capacity • Access of data not as quickas hard disks • Removable from the drive  1999 Addison Wesley Longman

  37. Magnetic Disk (II) • floppy disk • 8, 5 3/4, 3 1/2 inch (1.44M) • movable read/write head • track, sector • hard disk • faster, larger (8.4G, 12G, 30G) • cylinder, track, sector  1999 Addison Wesley Longman

  38. Optical Disks • CD-ROM and magneto-optical disks provide: • Random access of information • A high storage capacity • Have an access time that varies but is slower than hard disks • Are removable from the drive  1999 Addison Wesley Longman

  39. Optical Disk • CD-ROM (compact disk ROM) • about 600 MB • can be created on PC (CD-R, WORM) • rewritable optical disk (CD-RW)  1999 Addison Wesley Longman

  40. Storage Capacity A single CD-ROM can hold as much information as • 450 1440K diskettes • 500 books (text only)  1999 Addison Wesley Longman

More Related