Chapter 1

• Input device


  A piece of computer hardware equipment used to provide data and control signals to an information processing system such as computer or information appliance
• Major Input Devices


  • Keyboard
  • Mouse
  • Joystick
  • OMR (optical mark reader)
  • light pen
  • Point of Sale Terminal (POS Terminal)
  • BCR (bar code reader)
  • OCR (optical character reader)
• Keyboard


  • A computer keyboard is an input device used to enter characters and functions into the computer system by pressing buttons, or keys
  • It is the primary device used to enter text
  • A keyboard typically contains keys for individual letters, numbers and special characters, as well as keys for specific functions
  • A keyboard is connected to a computer system using a cable or a wireless connection
• Mouse


  • The mouse is a small, movable device that lets you control a range of things on a computer
  • Most types of mouse have two buttons, and some will have a wheel in between the buttons
  • Most types of mouse connect to the computer with a cable, and use the computer's power to work
  • Some types of mouse are wireless
• Joystick


  • A joystick is a hand-held input device used to control the movement or actions of a digital object on a computer screen
  • It typically consists of a handle or a lever that can be tilted or pushed in different directions to provide input to a computer or a gaming console
• OMR (Optical Mark Reader)


  • OMR is a technology that enables a machine to recognize marks made on a paper form, such as ticks, bubbles, or checkmarks
  • OMR is used to quickly and accurately capture information from paper forms, making it ideal for high-volume data collection
• Light pen


  • A light pen is an input device that utilizes a light-sensitive detector to select objects on a display screen
  • A light pen is similar to a mouse, except that with a light pen the pointer can be moved and objects can be selected on the display screen by directly pointing to the objects with the pen
• Point of Sale Terminal (POS Terminal)


  • A point-of-sale (POS) terminal is a hardware system for processing card payments at retail locations
  • Software to read magnetic strips of credit and debit cards is embedded in the hardware
• Bar Code Reader (BCR)


  • A bar code reader is an optical scanner that can read printed barcodes, decode the data contained in the barcode to a computer
• Optical Character Reader (OCR)


  • It is a technology that recognizes text within a digital image
  • It is commonly used to recognize text in scanned documents and images
• Output device


  A piece of computer equipment that receives data from one source and converts it into another form
• Different types of output devices


  • Monitor
  • Printer
  • Impact printer
  • Non impact printer
  • Speaker and headsets
  • Plotter
  • Multimedia projector
• Monitor


  • An electronic device that shows pictures for computers
  • Monitors often look like smaller televisions
  • The main difference between a monitor and a television is that a monitor does not have a television tuner to change channels
• Printer types


  • Impact printer
  • Non impact printer
• Impact printer


  • The printer that print the character by striking against the ribbon and into the paper
• Impact printer types


  • Character printer
  • Line printer
• Character printer


  • A printer that prints one character at a time
  • The typical character printer is the dot matrix printer
• Line printer


  • An impact printer which makes use of a continuous feed of paper and prints one line of text at a time
• Non-impact printer


  • Non impact printers that prints the character without striking against the ribbon and on the paper
  • These printer print a complete page at a time so also called page printer
• Non-impact printer types


  • Inkjet Printer
  • Laser Printer
• Inkjet printer


  • An inkjet printer is a computer peripheral that produces hard copies of a text document or photo by spraying droplets of ink onto paper
• Laser printer


  • Is a type of printer that uses a laser beam to produce high-quality text and graphics on paper
  • It works by using a combination of electrostatically charged toner and a heated fuser to transfer the toner onto the paper
• Speaker and headsets


  • Speaker and headsets produce sound output
  • We can listen recorded voices, sounds or music with the help of speaker or headset
• Plotter


  • A plotter is a printer that interprets commands from a computer to make line drawings on paper with one or more automated pens
  • Unlike a regular printer, a plotter can draw continuous point-to-point lines directly from vector graphic files or commands
• Multimedia projector


  • A multimedia projector is a presentation device used to show content from a Computer or Video Source on a large screen in order to benefit easier viewing for a larger number of viewers