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history  of computers

history of computers






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    history  of computers history of computers Presentation Transcript

    • What is a computer? • A computer is a general purpose device that can be programmed to carry out a set of arithmetic or logical operations.
    • • In 3000 BC early form of abacus with beads on wires were used in China. • This device allows users to make computations using a system of sliding beads arranged on a rack.
    • • Joseph-Marie Jacquard developed a loom in which the pattern being woven was controlled by punched cards. • The punched cards contain digital information represented by the presence or absence of holes in predefined positions.
    • • In 1833, Charles Babbage moved on from developing his difference engine (for navigational calculations) to a general purpose design • Analytical Engine was a general-purpose programmable computer, employing punch cards for input and a steam engine for power, using the positions of gears and shafts to represent numbers. • The marks the transition from mechanized arithmetic to fully-fledged general purpose computation The Difference Engine(1833) & Analytical Engine (1837)
    • The Difference Engine(1833) & Analytical Engine (1837) These marks the transition from mechanized arithmetic to fully-fledged general purpose computation
    • Early electronic digital computers
    • • It was the first electronic general-purpose computer. • It could add or subtract 5000 times a second, a thousand times faster than any other machine. ENIAC (Electronic Numerical Integrator and Computer) –(1945)
    • • Unlike its predecessor the ENIAC, it was binary rather than decimal, and was a stored program computer. EDSAC (Electronic Delay Storage Automatic Calculator )-1944
    • Vacuum tubes replaced relays Mid 1950's – transistors began to replace tubes Third generation: Integrated circuit (IC).First microprocessor, the 4004, a chip with all the circuitry for a calculator was made Fourth generation and above: Very Large Scale Integration (VLSI) and Networking Developments in different generations
    • It is currently the world's fastest supercomputer. total of 3,120,000 computing cores. 33.86 PFLOPS which is equalent to 3000 trillion calculations per second • It will be used for simulation, analysis, and government security applications. Present day super computer (Tianhe – 2)
    • • http://en.wikipedia.org/wiki/History_of_computing_hard ware • www.computerhope.com/issues/ch000984.htm • http://en.wikipedia.org/wiki/Tianhe-2 • http://people.bu.edu/baws/brief%20computer%20history. html • http://www.computerhistory.org/timeline/ • http://homepage.cs.uri.edu/faculty/wolfe/book/Readings/ Reading03.htm References