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history of computers

Oct 30, 2014




  • 1. 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.

2. 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. 3. 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. 4. 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) 5. The Difference Engine(1833) & Analytical Engine (1837) These marks the transition from mechanized arithmetic to fully-fledged general purpose computation 6. Early electronic digital computers 7. 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) 8. Unlike its predecessor the ENIAC, it was binary rather than decimal, and was a stored program computer. EDSAC (Electronic Delay Storage Automatic Calculator )-1944 9. 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 10. 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) 11. ware html Reading03.htm References

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