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7/30/2019 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.
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