Lecture 4 - Types of Computers

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    TYPES OF COMPUTER

    Lecture 4

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    Types of Computers

    Computers are classify according to:

    PurposeWhether the computer is

    general purpose or special purpose.

    Type of Data Handledis using analog,digital data or a combination of both.

    Capacitythe volume of work that the

    computer can handle is large or small.

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    Classification according to purpose

    General PurposeDesigned to handle variety

    of different problems andto meet different needs.

    Normally weak in speed &efficiency as comparedto Special purposecomputer.

    Use for applications such

    as payroll, accounts,inventory control,budgeting and salesanalysis.

    Special purpose

    Designed to handlespecific problem or toperform special task.

    Use for specific task likeSatellite tracking,industrial process,house hold devices.

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    Analog computer

    Analog computer were commonly usedfor scientific & engineering problems,particularly in chemical industry,

    electric power plants, and petroleumrefineries.

    These type of computers are rarely usein current world.

    Example an electric current meter, Fuelpump station meters etc.

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    Digital Computers

    Digital computer are specialized in counting,the digital computer handles values that are

    in a discrete (binary 1 or 0).

    Digital computer counts and answer thequestions by the method of HOW Many.

    The input data is represented by a number.

    These are used for the logical and

    arithmetic operations.All commonly used computers are DIGITAL

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    Hybrid Computer

    The combination of features of analogand digital computer is called Hybrid

    computer. Having both digital & analog

    features.Used in various areas of engineering,

    space vehicle simulation and training

    of astronauts, passenger flight radarsystem, also used to control robots.

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    Types of computer

    computer

    Digitalcomputer

    MicroComputer

    Desktop Workstation Laptops Handheld

    Main frameComputer

    SuperComputer

    MiniComputer

    Analogcomputer

    HybridComputer

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    Micro Computer

    Micro computer are the smallest computersystem. There size range from calculatorto desktop size. Its CPU ismicroprocessor. It also known as Grandchild Computer.

    There are two sub categories in it. One isPC which is less in price & reliability,

    other is Workstation which is expensivein price & reliability comparing with PC

    Application : - personal computer, Multiuser system, offices.

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    Portable computers (Mobile computers)

    Micro Computer

    Portable computers (Mobilecomputers)

    Not only desk computer but it you can

    transport it with anywhere.Subcategory: Laptop, Palmtops,

    Wearable Computers:

    Features: Lightweights less power uses

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    Mini Computer

    These are also small general purposesystem. They are generally more powerfuland most useful as compared to microcomputer. Mini computer are also known asmid range computer or Child computer.

    Now the term is not in use, once it wasbetween mainframe & personal computercategory, this category was defeated by PCor desktop computers because of reduce

    price and better performance in speed.Mini Computers are now replaced with Servers.

    Application :- Departmental systems, NetworkServers, work group system.

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    Servers

    Similar to desktop computers but morepowerful and reliable. With fault

    tolerant features.

    Using Multiple Processors 2-8 etc.,Memory in GBs, storage in TBs

    USE IN:

    Medium Size or Small organizations,Accounts Servers, email servers,

    Websites,

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    Main Frame Computer

    Mainframe computers are those computers thatoffer faster processing and grater storage area. Itis also known as Father computer.

    Designed for Multiple user interfaces. Differentpeople can operate these computers at the same

    time for complex intensive tasks. For Non Stop reliable operation, to upgrade

    these systems you dont have to switch off.

    Using Multiple Processors 2-24 etc., Memory inGBs, storage in TBs

    Application Host computer, Central data baseserver. Use in Large Business, Airlines, Banks, E-Commerce

    Sites, Military, Industrial organizations.

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    Super Computer

    Super computer are those computer whichare designed for scientific job like whether

    forecasting and artificial intelligence etc.

    They are fastest and expensive. A super

    computer contains a number of CPU which

    operate in parallel to make it faster. It also

    known as grand father computer.

    Application whether forecasting, weapons

    research and development.