1 / 23

Introduction to Computers

Lesson 2A Introduction to Computers Keyboard Alphanumeric keys Modifier keys Numeric keypad Function keys Cursor-movement keys Special-purpose keys Click to Enlarge How the Computer Accepts Input from the Keyboard Keyboard controller Keyboard buffer Scan code Interrupt request

medwin
Télécharger la présentation

Introduction to Computers

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. Lesson 2A Introduction to Computers

  2. Keyboard • Alphanumeric keys • Modifier keys • Numeric keypad • Function keys • Cursor-movement keys • Special-purpose keys Click to Enlarge

  3. How the Computer Accepts Input from the Keyboard • Keyboard controller • Keyboard buffer • Scan code • Interrupt request • Repeat rate Click to Enlarge

  4. The Mouse • An input device that rolls around on a flat surface and controls the pointer

  5. Examples of Mouse Maneuvers • Pointing • Clicking • Double-clicking • Dragging • Right-clicking

  6. Mouse Variants • Trackball • Trackpad • Integrated pointing device

  7. Lesson 2A • Standard Input Devices

  8. Keyboard • Primary input device for entering text and numbers

  9. Standard Keyboards Have Five Groups of Keys • Alphanumeric keys • Modifier keys • Numeric keypad • Function keys • Cursor-movement keys Click to Enlarge

  10. Mouse • An input device that rolls around on a flat surface and controls the pointer

  11. Pointer • Also called the mouse pointer • An on-screen object for selecting text; accessing menus; and interacting with programs, files, or data

  12. Other Pointing Devices • Trackball • Trackpad, also called a touchpad • Joystick, also called an integrated pointing device, 3-D point stick, or TrackPoint

  13. Alternative Input Devices • Devices for the hand • Optical devices • Audiovisual devices

  14. Monitors • Cathode ray tube (CRT) • Flat-panel. Most common flat-panel is the liquid crystal display (LCD) monitor

  15. Pixel • Pixel, short for picture element, is the smallest number of phosphor dots that the electron gun inside the monitor can focus on

  16. Two Main LCD Categories • Passive matrix LCDuses a transistor for each row and column of pixels. • Active matrix LCDuses a transistor for each pixel on the screen. * Thin-film transistor displays use multiple transistors for each pixel.

  17. Other Kinds of Monitors • Plasma/gas plasma displayCreated by sandwiching a special gas between two sheets of glass.

  18. Four Things to Consider When Monitor Shopping • Size • Resolution • Refresh rate • Dot pitch

  19. Video Controller • Intermediary device between the CPU and the monitor • Controls how things look on-screen (VGA card)

  20. Sound Card • Translates digital sounds into the electric current that is sent to the speakers

  21. Printers • Impact • Nonimpact

  22. Examples of Printers • Dot matrix • Ink jet • Laser

  23. Four Things to Consider When Printer Shopping • Image quality, measured in dots per inch (dpi) • Speed, measured in pages per minute (ppm) • Initial cost • Cost of operation

More Related