2. Peripheral devices Input devices

3. Input Devices zInput devices, such as keyboards or scanners, are hardware components that capture, collect, and transmit data and programs to the computer in a form that computer can understand. zInput devices transmit the input to the computer in a series of electronic pulses representing bits, or digits, of the binary code.

4. Types of Input zData yraw facts that a computer receives and processes to produce information zPrograms yinstructions that direct the computer operations zCommands ykey words that direct the computer to perform certain activities zUser Responses ydata a user enters to respond to a question or message.

5. Different type of input devices zA. Keyboard A. KeyboardA. Keyboard zB. Pointing devices B. Pointing devicesB. Pointing devices zC. Pen input devices C. Pen input devicesC. Pen input devices zD. Scanning devices D. Scanning devicesD. Scanning devices zE. Multimedia input devices E. Multimedia input devicesE. Multimedia input devices

6. A. Keyboard zThe most commonly used input devices. zContains alphanumeric, cursors and function keys. Function key Numeric keypad

7. xFunction Keys, labeled from F1 to F12, allow user to quickly access commands and functions, such as saving a document or calling up a program’s Help feature. xCursor-control Keys govern the movement of the cursor on the screen. They include Up Arrow, Down Arrow, Left Arrow and Right Arrow key on the keyboard. xSpecial Purpose Keys are used in conjunction with other keys to enter commands into a computer. Control (Ctrl), Alternate (Alt) Windows and Shift keys are example of special purpose keys.

8. xToggle Keys are keys that, when pressed, activates a certain mode or condition, and when pressed again, deactivates the condition. The Num Lock key, Cap Lock key and the Scroll Lock key are examples of toggle keys. (For example, pressing the Cap Lock key will cause all the alphanumeric characters to appear in capitals without holding down the Shift key.) xNumeric Keypad, located in the far right portion of the keyboard, is used for entering numbers quickly and for performing the same operations as a calculator. Not all keyboards have the same layout. Most keyboards have adopted the so-called QWERTY layout for the alphanumeric keys.

9. Types of Keyboard 104-key keyboard Natural keyboard Keyboard for the Mac

10. B. Pointing Devices zMany people use pointing devices instead of keyboards whenever possible. zPointing devices minimize the amount of typing (and the number of errors).

11. Mouse zPalm-sized pointing devices za ball on the bottom senses its movement zvarious actions can be preformed by moving the pointer and then pressing one of the buttons on top of the mouse.

12. Types of Mouse Cordless wheel mouse3-button mouse Wheel mouse for notebooks iMouse for iMac

13. Mouse Interfaces Serial PS2 USB

14. Trackball zUp-side down mouse zuser rotates the ball itself while clicking nearby buttons

15. TrackPoint Touchpad The mouse is not practical for people using a notebook computer in a small space. Track Point or Touch pad is therefore used instead to control the pointer.

16. Touch-Sensitive Screens zTouch screens enable the user to select an option by pressing a specific part of the screen. zTouch screens are commonly used in grocery stores( 食品雜貨店 ), fast-food restaurants, and information kiosks. A touch screen kit solution

17. Joysticks zUse the movement of a vertical stem to direct the pointer.

18. C. Pen Input Devices zInput data with hand written characters, select items by pressing the pen against the screen, and use gestures, which are special symbols, to issue commands.

19. Light Pen zUsed to select processing options or to draw on the screen The tip of a light pen contains a highly sensitive photoelectric cell. When the light pen is pointed close to the screen, the photoelectric cell detects the light emitted from the exact spot the pen is touching. This accuracy makes light pens very popular among engineers and draftsmen who use computer-aided design (CAD) software to create blueprints and drawings of products or construction projects.

20. Digitizing Tablet zA digitizing tablet consists of a grid on which designs and drawings can be entered. z Most tablets are pressure-sensitive, and the user draws directly on the tablet using a special pen called a stylus. Digitizing tablets are used to design cars, buildings, medical devices, and robots.

21. Chinese Handwriting Recognition Device zUsed for inputting and recognizing Chinese handwriting Nowadays, sophisticated ( 尖 端的 ) Chinese handwriting recognition system also contains voice recognition function.

22. D. Scanning Devices

23. Image Scanner zElectronically capture an entire image & convert it into digital form that can be processed by a computer

24. Image Scan Edit

25. Bar Code Reader zBar code consists of a set of vertical lines and spaces of different widths zUniversal Product Code (UPC) is very common An example of a bar code

26. Magnetic Ink Character Recognition (MICR) zUse a special ink that can be magnetized during processing zMICR is used by the banking industry as a means of processing checks it receives in every day. Magnetic Ink Character

27. Optical Character Recognition zOCR software can be installed in a computer to perform character recognition. a system of producing machine-readable code on a data source item and reading that code by means of optical scanning devices.

28. Optical Mark Recognition zOptical marks are the filled-in shape, usually ovals or rectangles, on scan sheets. zThe data collected on the scan sheets are translated into binary form by an optical mark reader (OMR) Use lead pencil to mark on scan sheet Feed the scan sheets into the OMR

29. E. Multimedia Input Devices

30. Voice Input Devices zA voice input device has two functions: yFirst, it can simply record and play back the voice inputted by the user. ySecondly, it can record a human voice, then with appropriate voice recognition software, convert the voice input to ASCII characters.

31. Digital Camera zRecord images in a form that can be stored by a computer. zSome digital cameras resemble traditional cameras and are portable. Some are connected directly to a computer. View Cam