Interacting with your computer

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Interacting with your computer

  1. 1. Peter Norton’s® Introduction to Computers Chapter 3 Interacting with Your Computer
  2. 2. Learning Objectives: • List at least three common input and output devices. • Name the processes a video monitor uses to displays images. • Name the components of a mouse and list the common techniques used to maintain a mouse. • Name three types of printers and list the advantages and disadvantages of each. • Explain how input and output devices communicate with the other parts of the computer.
  3. 3. Input Devices: • Keyboard • Touch Screen • Mouse • Bar Code Reader • Trackball • Image Scanner • Trackpad • Microphone • Pen • Video
  4. 4. Right click The mouse is a fairly intuitive input device. When it gets sluggish, turn it over and remove the cover plate. Left click Carefully clean the ball and rollers.
  5. 5. Parts of a Keyboard: • • • • • • • Alphanumeric Keys Modifier Keys Numeric Keypad Function Keys Cursor-movement Keys Escape Key Special-purpose Keys
  6. 6. Factors Affecting Monitors: • Size • Resolution • Refresh rate • Dot pitch
  7. 7. Size is measured diagonally. The picture is scanned from left to right and from top to bottom. One complete set of scan lines is called a frame. Refresh rate = number of frames in one second Resolution = no. of pixels (i.e. 1024 x 768) 1 pixel in a color monitor
  8. 8. Flat-Panel Monitors: • LCD (Liquid Crystal Display) • Passive Matrix • Active Matrix (Notebooks use LCD displays)
  9. 9. Types of Printers: • Ink Jet • Dye-Sub • Laser • Fiery • Dot-Matrix • IRIS • Thermal-Wax • Plotter
  10. 10. Ink jets are popular because of their relatively low cost and color capability.
  11. 11. Laser printers are faster and capable of high resolution. Toner transferred from drum to paper Heat roller bonds toner to paper Rotating mirror Laser beam Paper is given a static charge Laser transfers image to drum
  12. 12. Printer Criteria: • Image Quality • Speed • Initial Cost • Cost of Operation
  13. 13. Types of Interfaces: • Serial • Parallel • Centronics • SCSI
  14. 14. UART Receiver RS232 Driver Transmitter Control Start 1 Stop 2 Bit 3 Bit4 6 bit Bit 7 5 0 To modem Serial data transmission is relatively slow! The serial ports transfer data one bit at a time.
  15. 15. PIA Receiver Drivers Transmitter To printer Control The parallel port transfers data one byte at a time.
  16. 16. A SCSI card can be plugged into an expansion slot. SCSI devices can be daisychained.
  17. 17. Learning Objectives: Chapter 3 Review • List at least three common input and output devices. • Name the processes a video monitor uses to displays images. • Name the components of a mouse and list the common techniques used to maintain a mouse. • Name three types of printers and list the advantages and disadvantages of each. • Explain how input and output devices communicate with the other parts of the computer.

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