History of Computers.

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Presentation transcript:

History of Computers

Over 5,000 years ago…

1600’s Blaise Pascal Gottrfried von Leibniz Pascaline Improved on Pascaline

1600’s Pascaline Blaise Pascal

Early 1800’s Joseph Marie Jacquard Charles Xavier Thomas Jacquard’s Loom Charles Xavier Thomas Arithometer

Early 1800’s Jacquard’s Loom

Mid-1800’s Charles Babbage Countess Ada Lovelace

Mid 1800’s Analytical Engine

Late 1800’s

1945 - 1956 First Generation Computers Used Vacuum tubes Each computer had its own machine language Examples: Colossus ENIAC UNIVAC

1945 - 1956 ENIAC

1945 - 1956 UNIVAC

1945 - 1956 Term “Computer Bug” coined by Admiral Grace Hopper

1956 - 1963 Second Generation Computers Transistors replaced vacuum tubes Era of the punch cards Examples LARC Stretch IBM 1401

1956 - 1963 IBM 7094 IBM 1401

1964 - 1971 Third Generation Computers Integrated Circuits replaced transistors Operating System used Examples IBM System 360 Cray

1964 - 1971 Cray 23 Cray 29

1964 - 1971 IBM System 360

1971 - present Fourth generation computers Large Scale Integration (LSI) Very Large Scale Integration (VLSI) Ultra Large Scale Integration (ULSI) Era of the Personal Computer Pioneering Examples Commodore Radio Shack Apple IBM

1971 - present Dell Dimension 8200 IBM PC 1

1971 - present ASCI White Most powerful computing platform ever built! 12.3 TeraOps (12,300,000,000,000 operations per second)

1971 - present 1981 – 2 million computers in use 1992 – 65 million personal computers

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