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Second types of computers






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Second   types of computers Second types of computers Presentation Transcript

  • Types of Computers
  • The Many Kinds of Computers
    • Computers can be classified by three sets of characteristics:
    Electronic versus Mechanical General-purpose versus Special-purpose Digital versus Analog
  • The Many Kinds of Computers
    • Electronic Computer
      • Constructed from transistors and electrical circuits.
      • Needs an electrical source to function.
    • Mechanical Computer
      • Constructed of a combination of gears, levers and/or springs.
      • Produces its own intrinsic energy. (Does not need electricity to function.)
    View slide
  • The Many Kinds of Computers
    • General-purpose Computer
      • Was not manufactured to do any one thing.
      • Changeable to do any task.
    • Special-purpose Computer
      • Manufactured to perform a predetermined task or set of tasks.
    View slide
  • The Many Kinds of Computers
    • Digital Computer
      • One that functions in discretely varying quantities.
      • Produces or gives results that are also discretely varying.
    • Analog Computer
      • One that functions in continuously varying quantities.
      • Produces or gives results that are also continuously varying.
  • Microcomputer
    • A personal computer; designed to meet the computer needs of an individual.
    • Provides access to a wide variety of computing applications, such as word processing, photo editing, e-mail, and internet.
  • Desktop Computer
    • A microcomputer that fits on a desk and runs on power from an electrical wall outlet.
    • The CPU can be housed in either a vertical or horizontal case.
    • Has separate components (keyboard, mouse, etc.) that are each plugged into the computer.
  • Laptop Computer
    • A portable, compact computer that can run on an electrical wall outlet or a battery unit.
    • All components (keyboard, mouse, etc.) are in one compact unit.
    • Usually more expensive than a comparable desktop.
    • Sometimes called a notebook.
  • Mini computer
    • These computers look similar to personal computers that you or I use regularly at home.
    • They are used for doing powerful jobs which could once only be performed by mainframes.
    • They tend to be used by small to medium sized businesses to manage their data processing needs.
  • Mini computer
    • Examples of the types of business which would use a mini computer are:
      • Estate Agents – Tracking House Sales
      • Travel Agents – For the latest holiday details
      • Small Insurance Companies – Handling customer information.
  • Workstation
    • Powerful desktop computer designed for specialized tasks.
    • Can tackle tasks that require a lot of processing speed.
    • Can also be an ordinary personal computer attached to a LAN (Local Area Network).
  • Supercomputer
    • A computer that was the fastest in the world at the time it was constructed.
    • They are used for performing trillions of complex calculations in a very short time.
    • Supercomputers cost over a hundred million pounds to build and need specifically designed rooms and environments to ensure that they operate efficiently.
  • Supercomputer
    • Can tackle tasks that would not be practical for other computers
      • Typical uses
        • Breaking codes
        • Modeling weather systems
        • Space Exploration
        • Advanced Scientific Research
        • Military establishment – weapons research
        • Pharmaceutical / Drug Testing.
  • Mainframe
    • Large expensive computer capable of simultaneously processing data for hundreds or thousands of users.
    • They are slower than a Super Computer, but far less expensive.
    • They execute billions of instructions per second and can process large volumes of data simultaneously.
  • Mainframe
    • Used to store, manage, and process large amounts of data that need to be reliable, secure, and centralized.
    • They are usually connected to a large number of peripherals e.g. printers, disc drives, terminals and so on.
    • Usually housed in a closet sized cabinet.
    • Mainframe computers are often used to control an entire factory assembly line - recording the movement of materials, paying of bills, sending invoices and so on.
  • Server
    • Purpose is to “serve.”
    • A computer that has the purpose of supplying its users with data; usually through the use of a LAN (Local Area Network).
  • Handheld
    • Also called a PDA (Personal Digital Assistant).
    • A computer that fits into a pocket, runs on batteries, and is used while holding in your hand.
    • Typically used as an appointment book, address book, calculator, and notepad.
    • Can be synchronized with a personal microcomputer as a backup.