History Of the Computer

Words and Definitions

Hard Drive (HDD)/SSD

A hard drive or solid state drive stores a PC's operating system and software.
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Optical Drive

An optical drive is any storage device that uses light to read and write information
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A monitor or a display is an electronic visual display for computers.
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The central processing unit, or CPU, with its level 1 cache memory, contains the control unit and the arithmetic/logic unit, both working together as a team to process the computer's commands
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Memory that the computer readily reads from and writes to. Once the computer is turned off the RAM is erased.

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The main circuit board that connects all of the computer's components together.

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Inputs receive data for the computer and outputs send information from the computer.
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Touch Screens

Touch screens are common in devices such as game consoles, personal computers, tablet computers, and smartphones.
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Operating Systems / Other software

The software that manages your computer environment.
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Tim Berners-Lee

Tim Berners-Lee invented the World Wide Web in 1989
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Alan Turing

Alan Turing is the inventor of the computer
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The Four Generations of Computers

First Generation

It was developed by two scientists Mauchly and Echert at the Census Department of United States in 1947. The first generation computers were used during 1942-1955. They were based on vacuum tubes. Examples of first generation computers are ENIVAC and UNIVAC-1.

Second Generation

The second generation computers used transistors. The scientists at Bell laboratories developed transistor in 1947. These scientists include John Barden, William Brattain and William Shockley. The size of the computers was decreased by replacing vacuum tubes with transistors.

Third Generation

The Third generation computers used the integrated circuits (IC). Jack Kilby developed the concept of integrated circuit in 1958. It was an important invention in the computer field. The first IC was invented and used in 1961. The size of an IC is about ¼ square inch. A single IC chip may contain thousands of transistors. The computer became smaller in size, faster, more reliable and less expensive.

Fourth Generation

The fourth generation computers started with the invention of Microprocessor. The Microprocessor contains thousands of ICs. Ted Hoff produced the first microprocessor in 1971 for Intel. It was known as Intel 4004. The technology of integrated circuits improved rapidly. The LSI (Large Scale Integration) circuit and VLSI (Very Large Scale Integration) circuit was designed. It greatly reduced the size of computer.

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fourth generation computer