mini computer

A physically small and less working capability computer compared to mainframe is called mini computer.This type of computer can be set up on a large size table.Many users can use it simultaneously by connecting several terminals.Mini computer is generally used in offices,Banks,Clinics,Hospitals,Garments factory and Multinational companies etc.The PDP .Series of computer are mini computer.

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mainframe computer

Mainframe computer is less powerful than the super computer that can analyse huge quantity of data quickly.They are used in big research institutes,educational institutes, banks, large organizations etc.A large number of users can use such a computer simultaneously.At first mainframe computer is installed at "Bangladesh Atomic Energy Commission" in 1962.Later on mainframe computer is also installed at Dhaka University, BUET, Statical-Bureau,PDB etc.An example of mainframe computer is IBM370 and VAX11/780.

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Super Computer

Super Computer is the most powerful,expensive,and high speedy computer.In a few countries of the recent world have super computer.It can perform more than crores of  calculation within a second.This computer is being used in sophisticated scientific research,cosmic research,and in the military affairs.Its sale and production are restricted.These types of computers are not available in Bangladesh.In recent time India has introduced and used their own made super computer named`Parem`

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classification of computer

The word computer is derived form the Latin word computear. Which means a calculating machine.Computers are available in different sizes with different capabilities.They may be classified in the following four categories.
1.Super Computer
2.Mainframe Computer
3.Mini Computer
4.Micro or personal Computer(PC)

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Invention history of computer

The Computer is a fairly recent invention

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It has become an essential part of modern life.The true ancestor of the modern computer was designed by the English mathematician,Charles Babbage in the 1830`s.This machine,called the Analytical Engine,was never completed but it was intended to perform any mathematical calculation automatically by means of a mechanical device.His idea was put into practice in1944 by Professor Howard Aiken of Harvard University,who in association with the International Business  Machines Corporation(IBM),completed the Automatic Sequence controlled calculator(ASCC) or Mark-1, It was a mechanical computer,and not an electronic one.The first eletronic digital computer,called the Numerical Integrater and Calculator(ENIAC) was completedin1946 by a team of scientists at the university of Pennsylvania.

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