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First Generation of computer

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The period of the first generation was from 1946-1955. In this generation used vacuum tubes as the basic components for memory and circuitry for central processing unit (CPU). ENIAC (Electrical Numerical Integrator And Computer) was first electronic computer developed in 1946 by Mauchley and Eckert in USA. This computer used high speed vacuum tube to process data, in this generation used machine code as a programming language. This machine was 30×18 feet long and weight 30 ton and cost $4 lakh dollar. Characteristics of the first generation computer Use of magnetic drums Use of vacuum tubes to make circuits Use of machine languages and symbols in instructions Use of punch cards as input/output devices Use of high electricity Very small reliable output Complex and expensive to maintain Huge in size and poor mobility Some computers of first generation ENIAC ...
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Fourth Generation of Computer

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The period of the fourth generation of computer was from 1971-1980. In this generation used LSI and VLSI (Very Large Scale Integration) circuits. VLSI circuits having at list 5000 transistors and other circuits elements. The microprocessor was used in fourth generation computers. Fourth generation computers were small in size, reliable, compact and more powerful. In this generation were used real time networks, time sharing and distributed operating system. All the high level programming languages like C, C++, DBASE, etc., were developed in fourth generation computer. Characteristics of fourth generation Microprocessor based system that use VLSI circuits Very small in size Less power consumption Faster, reliable and cost-effective Use of VLSI (Very large Scale Integration No AC required Some computers of fourth generation are following: PDP 11 DEC 10 STA...
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Keyboard

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Keyboard     Keyboard is an input device consisting a set of type writer like keys that enable you to enter data into your computer. It is a typewriter-style device. These are the most common and very popular input device. It help us input data to the computer/desktop. The layout of the keyboards is like that of traditional typewriter. There are 5 pare of a keyboard. Typing Keys Function Keys Control Keys Number Keys Special Purpose Keys Typing Keys The typing keys include the letter keys ( A-Z ) and digit keys ( 0-9 ) which generally give the same layout as typewriters. Function Keys The twelve function keys are present on the keyboard which are arranged in a line at the top ( F1, F2, F3, F4, .. F11, F12 ). ...
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