basic Input output device presentation

basic Input output device presentation

• 1.
   C=Common  O=Oriented M=Machine  P=Particularly  U=Used for  T=Trade  E=Education  R=Research Basic devices of computer
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  A computer systemneeds to communicate with its external environment its user). The Input/output devices provide this capability to a computer system. they are also known as peripheral devices, because they surround a computer's cpu and memory. INPUT OUTPUT DEVICES
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  Input data from external world INPUT DEVICE Input data codedinto internal form CPU & memory Processed data in internal for OUTPUT DEVICES Result of processing in human acceptable form
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  INPUT DEVICE Input devicesare used to enter data from outside world into primary storage & output devices supply the result of processing from primary storage to users. Input device is any peripheral (piece of computer h/w equipment) used to provide data & control signals to an information processing system. Input/output devices make up the h/w interface between a computer .
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  THE MOST COMMONINPUT DEVICES A R E FOLLOW ING .  Keyboard  Mouse
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  KEYBOARD • The keyboardis the main input device for computers. For instance, boot up a computer without a keyboard and it stops, warning the user that no keyboard is attached. • The keyboard is the only tool available at the command prompt, so it is a necessity for a computer. • It is also used in almost every application like spreadsheets, email, word processing documents and coding.
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  KEYBOARDS AS INPUT DEVICES QWERTY keyboard  Dvorak keyboard  alphabetical keyboard  chord keyboard  numeric keypad 7
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  MOUSE  Mouse ismost popular pointing device. It is a very famous cursor- control device having a small palm size box with around ball at its base which senses the movement of mouse and sends corresponding signals to CPU when the mouse buttons are pressed.  Generally it has two buttons called left and right button and a wheel is present between the buttons.  Mouse can be used to control the position of cursor on screen, but it cannot be used to enter text into the computer.
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  TYPES OF MOUSE Mechanical Mouse  Optomechanical Mouse  Optical Mouse
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  Output device  Anoutput device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) to the outside world.  In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer), and the outside world.  Inputs are the signals or data sent to the system, and outputs are the signals or data sent by the system to the outside.
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  EXAMPLES OF OUTPUTDEVICES:  Screen (Monitor)  Printer
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  MONITOR  A Monitoror Display (sometimes called a visual display unit) is an electronic visual display for computers.  The monitor comprises the display device, circuitry, and an enclosure.  The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors use a cathode ray tube about as deep as the screen size.
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  TYPES OF MONITOR Towbasic types of monitors are used with micro computers, which are as follows:  Cathode-Ray Tube(CRT)  Thin Film Transistor (TFT)/Flat Panel Display
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  CRT:  Cathode-Ray Tube: (CRT) Monitor The CRT display is made up of small picture elements called pixels.  The smaller the pixels, the better the image clarity, or resolution. It takes more than one illuminated pixel to form whole character, such as the letter 'e' in the word help. A finite number of characters can be displayed on a screen at once. The screen can be divided into a series of character boxes fixed location on the screen where a standard character can be placed. Most screens are capable of displaying 80 characters of data horizontally and 25 line There are some disadvantages of CRT Large in Size High power consumption
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  TFT:  Flat-Panel DisplayMonitor The flat-panel display refers to a class of video devices that have reduced volume, weight and power requirement in comparison to the CRT.  You can hang them on walls or wear them on your wrists.  Current uses of flat-panel displays include calculators, video games, monitors, laptop computer, graphics display.  The flat-panel display is divided into two categories Emissive Displays - The emissive displays are devices that convert electrical energy into light.  Example are plasma panel and LED(Light-Emitting Diodes).  Non-Emissive Displays - The Non-emissive displays use optical effects to convert sunlight or light from some other source into graphics patterns. Example is LCD(Liquid-Crystal Device).
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  PRINTER  After adocument is created on the computer, it can be sent to a printer for a hard copy (printout).  Some printers offer special features such as coloured and large page formats Some of the most commonly used printers are:  Laser Printer  Ink Jet Printer  Dot Matrix Printer  Line Printer
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  LASER PRINTER  LaserPrinter: A laser printer produces high quality print that one normally finds in publishing.  It is extremely fast andquiet. Moreover, the operation of a laser printer is easy with automatic paper loading and no smudging or messing up ofink ribbons.  The fastest laser printer Laser Printer Basics of Computer :: 9 can print up to 200 pages per minute inmonochrome (black and white) and up to 100 pages per minute in colour.
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  INK-JET PRINTER  Ink-jetPrinter: An ink-jet printer creates an image directly on paper by spraying ink through as many as 64 tiny nozzles Although the image it produces is not generally quite as sharp as the output of a laser printer, the quality of ink-jet images is still high.  In general, ink-jet printer offers an excellent middle ground between dot matrix and laser printer Like laser printer, an ink-jet printer is quiet and convenient, but not particularly fast.  Typically, an ink-jet printer is more expensive than a dot-matrix printer, but costs only half as much as a laser printer.
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  DOT MATRIX PRINTER: Dot Matrix Printer: The dot matrix printer was very popular at one point of time.  It is a very versatile and inexpensiveoutput device.  In dot matrix printer the print head physically "hits" the paper through the ribbon and produces text (orimages) by combinations of dots; hence the name dot matrix printer.  Its speed is measured in characters per second(CPS). Although it is less expensive, it is louder, slower and produces lower print quality.