INPUT AND OUTPUT  DEVICES Introduction to Computers
Introduction <ul><li>Devices which are a means of communication between the computer and the outside world are called PERI...
Input Devices <ul><li>Those peripheral devices which supply information i.e. data and program from the outside world to th...
Punched Cards <ul><li>Data is recorded on punched cards or tapes. </li></ul><ul><li>It uses standard codes, like HALLERITH...
Keyboard <ul><li>Similar to typewriter keyboard. </li></ul><ul><li>Keys on keyboard consist up of letters, numbers, symbol...
Mouse <ul><li>A pointing device. </li></ul><ul><li>Control and manipulate cursor movement on monitor. </li></ul><ul><li>Ha...
Light Pen <ul><li>A picking device. </li></ul><ul><li>Contains a photocell placed in a small tube. </li></ul><ul><li>Photo...
Joystick <ul><li>Widely used in computer or video games. </li></ul><ul><li>The direction and speed with which the joystick...
Track Ball <ul><li>Also known as roller ball. </li></ul><ul><li>Uses a hard sphere to control cursor movement. </li></ul><...
Touch Screen <ul><li>A touch panel is transparent plate. </li></ul><ul><li>Input is registered when a finger or any other ...
Digitizer <ul><li>It converts a graphical or pictorial data into digital form which can be directly entered and stored in ...
Flat Bed Digitizer <ul><li>The drawing to be digitized is fixed over a flat bed table and a stylus or a pen is moved over ...
Image scan digitizer <ul><li>The entire image is scanned and reproduced automatically. </li></ul><ul><li>It is more powerf...
Scanner <ul><li>It is able to directly enter text and images into the computer memory. </li></ul><ul><li>Eliminated the du...
Optical Mark Reader <ul><li>Capable of reading pre-specified marks made by pencils or pen with the help of light. </li></u...
Optical Character Reader <ul><li>It can read alphabets, characters and numbers printed on paper. </li></ul><ul><li>Charact...
Bar Code Reader <ul><li>It reads bar coded data. </li></ul><ul><li>Laser beam scanner is used to read the bar code. </li><...
MAGNETIC INK CHARACTER RECOGNITION (MICR). <ul><li>Mainly finds application in banking areas. </li></ul><ul><li>It is used...
Voice Recognition System <ul><li>Uses microphone or telephone, a sound card an special software. </li></ul><ul><li>Voice r...
Output Devices <ul><li>The output devices allow computer to communicate with the outside world by accepting data from the ...
Printer <ul><li>It produces the output from the computer on the paper. </li></ul><ul><li>Produces a hard copy i.e. permane...
Impact Printer <ul><li>Similar to typewriter. </li></ul><ul><li>Use hammer to strike a character against an ink ribbon. </...
Dot Matrix Printer <ul><li>Print each character as a pattern of dots. </li></ul><ul><li>Relatively low in cost. </li></ul>...
Daisy Wheel Printer <ul><li>Also called as letter quality printers </li></ul><ul><li>Letter quality of these printer is mu...
Line Printer <ul><li>Very fast printer and print at speed of 200-2500 lines per second. </li></ul><ul><li>It normally have...
Ink Jet Printer <ul><li>Prints character by spraying ink from tiny nozzles onto the paper. </li></ul><ul><li>Output is of ...
Laser Printers <ul><li>Produced a very superior quality output. </li></ul><ul><li>Have a buffer memory to store entire pag...
Plotter <ul><li>A plotter is a an output device used in applications where printouts of graphs and drawings are required <...
Flat Bed Plotters Introduction to Computers
Drum Plotters Introduction to Computers
Monitors <ul><li>Monitor is a device like television screen which is used to display information </li></ul><ul><li>The res...
Cathode Ray Tube Monitor Introduction to Computers
Flat Panel Display Introduction to Computers
Video Display Terminal <ul><li>The most popular output device in direct access processing is the Video Display Terminal </...
Computer Microfilm Output (COM) <ul><li>This technology is used to record computer output as a microscopic film images. </...
Enjoy Frnzz!
Thank You!! Introduction to Computers
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  1. 1. INPUT AND OUTPUT DEVICES Introduction to Computers
  2. 2. Introduction <ul><li>Devices which are a means of communication between the computer and the outside world are called PERIPHERAL DEVICES </li></ul><ul><li>The processors which are required to convert the input data into machine readable form and to convert the output generated by the computer into human readable form are known as INPUT/OUTPUT (I/O) interfaces. </li></ul>Introduction to Computers
  3. 3. Input Devices <ul><li>Those peripheral devices which supply information i.e. data and program from the outside world to the computer are called INPUT DEVICES. </li></ul><ul><ul><li>Punched Cards </li></ul></ul><ul><ul><li>Keyboard </li></ul></ul><ul><ul><li>Mouse </li></ul></ul><ul><ul><li>Light Pen </li></ul></ul><ul><ul><li>Joystick </li></ul></ul><ul><ul><li>Track Ball </li></ul></ul><ul><ul><li>Touch Screen </li></ul></ul><ul><ul><li>Digitizer </li></ul></ul><ul><ul><li>Scanners </li></ul></ul><ul><ul><li>Voice Recognition Systems </li></ul></ul>Introduction to Computers
  4. 4. Punched Cards <ul><li>Data is recorded on punched cards or tapes. </li></ul><ul><li>It uses standard codes, like HALLERITH code. </li></ul><ul><li>Cheap and reliable. </li></ul><ul><li>Cannot be reused. </li></ul><ul><li>Special care has to be taken. </li></ul><ul><li>If a single card is misplaced then it is very difficult to rearrange and detect the problem. </li></ul><ul><li>Require large storage space & cannot be folded. </li></ul>Introduction to Computers
  5. 5. Keyboard <ul><li>Similar to typewriter keyboard. </li></ul><ul><li>Keys on keyboard consist up of letters, numbers, symbols and function keys. </li></ul><ul><li>Special keys like Tab, Del, Ctrl, PgUp, PgDn,etc. </li></ul><ul><li>Easy to use and offers number of facilities. </li></ul><ul><li>Can edit the input data very easily. </li></ul><ul><li>Relatively inexpensive. </li></ul>Introduction to Computers
  6. 6. Mouse <ul><li>A pointing device. </li></ul><ul><li>Control and manipulate cursor movement on monitor. </li></ul><ul><li>Has three or four buttons on it and roller ball which signals the movements on a flat surface. </li></ul><ul><li>Move fast from one part of the screen to the other. </li></ul>Introduction to Computers
  7. 7. Light Pen <ul><li>A picking device. </li></ul><ul><li>Contains a photocell placed in a small tube. </li></ul><ul><li>Photocell detect the presence of light on the CRT (monitor). </li></ul><ul><li>Tip of pen is moved on the surface of the screen to write or sketch data. </li></ul><ul><li>Specially useful in Computer Aided Design (CAD) application </li></ul>Introduction to Computers
  8. 8. Joystick <ul><li>Widely used in computer or video games. </li></ul><ul><li>The direction and speed with which the joystick is moved is converted into digital signal and sent to the computer system. </li></ul><ul><li>This in turn controls the movement of the cursor on the screen. </li></ul>Introduction to Computers
  9. 9. Track Ball <ul><li>Also known as roller ball. </li></ul><ul><li>Uses a hard sphere to control cursor movement. </li></ul><ul><li>Ball can be rotated in any direction by hand. </li></ul><ul><li>This digital signal in translated to control the cursor movement on the screen. </li></ul>Introduction to Computers
  10. 10. Touch Screen <ul><li>A touch panel is transparent plate. </li></ul><ul><li>Input is registered when a finger or any other object comes in contact with the plate. </li></ul>Introduction to Computers
  11. 11. Digitizer <ul><li>It converts a graphical or pictorial data into digital form which can be directly entered and stored in a computer. </li></ul><ul><li>It is also called a graphical tablet. </li></ul>Introduction to Computers
  12. 12. Flat Bed Digitizer <ul><li>The drawing to be digitized is fixed over a flat bed table and a stylus or a pen is moved over the surface of the drawing. </li></ul><ul><li>This scans the drawing and produces the output related to X and Y coordinate. </li></ul>Introduction to Computers
  13. 13. Image scan digitizer <ul><li>The entire image is scanned and reproduced automatically. </li></ul><ul><li>It is more powerful as compared to flat bed digitizers. </li></ul><ul><li>It is mainly used in simple drawings, graphs etc. whereas image scan digitizers are used for photographs and pictures. </li></ul>Introduction to Computers
  14. 14. Scanner <ul><li>It is able to directly enter text and images into the computer memory. </li></ul><ul><li>Eliminated the duplication work of entering data . </li></ul><ul><li>This result into increase in speed of data entry and accuracy. </li></ul>Introduction to Computers
  15. 15. Optical Mark Reader <ul><li>Capable of reading pre-specified marks made by pencils or pen with the help of light. </li></ul><ul><li>Used where data is preprinted for application. </li></ul><ul><li>Used for the answer papers of the objective tests where the answers are marked with pencils or preprinted forms. </li></ul>Introduction to Computers
  16. 16. Optical Character Reader <ul><li>It can read alphabets, characters and numbers printed on paper. </li></ul><ul><li>Character can either handwritten or typed. </li></ul><ul><li>It reads each character as a collection of pixels </li></ul><ul><li>Mainly used in processing where the data volumes are large . </li></ul>Introduction to Computers
  17. 17. Bar Code Reader <ul><li>It reads bar coded data. </li></ul><ul><li>Laser beam scanner is used to read the bar code. </li></ul><ul><li>Most commonly used bar code is the Universal Product Code (UPC). </li></ul>Introduction to Computers
  18. 18. MAGNETIC INK CHARACTER RECOGNITION (MICR). <ul><li>Mainly finds application in banking areas. </li></ul><ul><li>It is used to encode the character to be read. </li></ul><ul><li>It speed up data entry, and even roughly handled cheques can be processed relatively easily. </li></ul><ul><li>Only a limited number of digits and character are available for encoding. </li></ul>Introduction to Computers
  19. 19. Voice Recognition System <ul><li>Uses microphone or telephone, a sound card an special software. </li></ul><ul><li>Voice recognition system are highly operator dependent. </li></ul><ul><li>Reduces the cost of data entry. </li></ul><ul><li>Can move freely while talking into the computer. </li></ul>Introduction to Computers
  20. 20. Output Devices <ul><li>The output devices allow computer to communicate with the outside world by accepting data from the computer & transforming I into user readable form. </li></ul><ul><ul><li>Printers </li></ul></ul><ul><ul><li>Plotters </li></ul></ul><ul><ul><li>Monitor </li></ul></ul><ul><ul><li>Video Display Terminal </li></ul></ul><ul><ul><li>Computer Output Microfilm </li></ul></ul>Introduction to Computers
  21. 21. Printer <ul><li>It produces the output from the computer on the paper. </li></ul><ul><li>Produces a hard copy i.e. permanent copy of the result which can be stored and read later. </li></ul><ul><ul><li>Impact Printers </li></ul></ul><ul><ul><li>Non-Impact Printers </li></ul></ul>Introduction to Computers
  22. 22. Impact Printer <ul><li>Similar to typewriter. </li></ul><ul><li>Use hammer to strike a character against an ink ribbon. </li></ul><ul><li>Noisy in operation. </li></ul><ul><li>Its functioning is relatively easily. </li></ul><ul><li>It can produced multiple copy at the same time. </li></ul><ul><li>Subject to wear and tear of mechanical parts </li></ul>Introduction to Computers
  23. 23. Dot Matrix Printer <ul><li>Print each character as a pattern of dots. </li></ul><ul><li>Relatively low in cost. </li></ul><ul><li>Print at speed 50-500 character per second. </li></ul>Introduction to Computers
  24. 24. Daisy Wheel Printer <ul><li>Also called as letter quality printers </li></ul><ul><li>Letter quality of these printer is much superior as compared to the dot matrix printer </li></ul><ul><li>They are slow and typically print in the range of 10-50 characters per second </li></ul>Introduction to Computers
  25. 25. Line Printer <ul><li>Very fast printer and print at speed of 200-2500 lines per second. </li></ul><ul><li>It normally have 132 print positions per lines. </li></ul><ul><li>It is normally used in application where large volumes of data are to be printed </li></ul>Introduction to Computers
  26. 26. Ink Jet Printer <ul><li>Prints character by spraying ink from tiny nozzles onto the paper. </li></ul><ul><li>Output is of a superior quality. </li></ul><ul><li>Possible to obtain coloured output. </li></ul><ul><li>Number of character styles and sizes are available. </li></ul>Introduction to Computers
  27. 27. Laser Printers <ul><li>Produced a very superior quality output. </li></ul><ul><li>Have a buffer memory to store entire pages and hence their speed is very fast. </li></ul><ul><li>No mechanical movement is involved. </li></ul><ul><li>Noiseless in operation. </li></ul><ul><li>Comparatively expensive </li></ul>Introduction to Computers
  28. 28. Plotter <ul><li>A plotter is a an output device used in applications where printouts of graphs and drawings are required </li></ul><ul><li>Plotters are of two types </li></ul><ul><ul><li>Flat Bed Plotter </li></ul></ul><ul><ul><li>Drum Plotters </li></ul></ul>Introduction to Computers
  29. 29. Flat Bed Plotters Introduction to Computers
  30. 30. Drum Plotters Introduction to Computers
  31. 31. Monitors <ul><li>Monitor is a device like television screen which is used to display information </li></ul><ul><li>The resolution of monitors is the number of picture elements </li></ul><ul><li>Monitors are of two types </li></ul><ul><ul><li>Cathode Ray Tube Monitor (CRT) </li></ul></ul><ul><ul><li>Flat Panel Display </li></ul></ul>Introduction to Computers
  32. 32. Cathode Ray Tube Monitor Introduction to Computers
  33. 33. Flat Panel Display Introduction to Computers
  34. 34. Video Display Terminal <ul><li>The most popular output device in direct access processing is the Video Display Terminal </li></ul><ul><li>The Monitor & Keyboard together are called a Terminal </li></ul><ul><li>3 types of terminals </li></ul><ul><ul><li>Dumb </li></ul></ul><ul><ul><li>Smart </li></ul></ul><ul><ul><li>Intelligent </li></ul></ul>Introduction to Computers
  35. 35. Computer Microfilm Output (COM) <ul><li>This technology is used to record computer output as a microscopic film images. </li></ul><ul><li>Information is recorded on a roll of film. </li></ul><ul><li>COM devices are used applications where there are large volumes of data. </li></ul><ul><li>They are much more faster than normal printers </li></ul><ul><li>Sophisticated & Expensive </li></ul>Introduction to Computers
  36. 36. Enjoy Frnzz!
  37. 37. Thank You!! Introduction to Computers

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