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History of computers. Charles McAnany.

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Abacus A simple, hand-held calculator. Developed by the Babylonians around 2400 BCE. Not programmable – simply a convenient way to store numbers. A Chinese abacus, or suanpan. Capable of addition, subtraction, Multiplication, division, square root, and cube root.

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Programs. Medieval Islamic world saw the first programmable device – an automatic flute. If given notes to play, it would open the correct holes, so your fingers didnt have to. In 1801, the Jacquard loom first used punched cards to store programs. kipedia/commons/0/09/Jacquar d.loom.cards.jpg

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Difference engine The first programmable computer was Babbages difference engine. It took a description of a calculation to be performed, and performed it. In this sense, it is equivalent to a modern computer. age_Difference_Engine.jpg ikipedia/commons/d/d2/Charl es_Babbage_1860.jpg

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Electrification and tape /43/Cambridge_differential_analyser.jpg a.org/wikipedia/en/7/7 1/Honolulu_IFSS_Telety pe1964.faa.jpg

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Modern computers Started by WWII, in Finished in 46, shut down in 55. Programmable, entirely electric. Turing- complete

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Von-Neumann machines Equivalent to a Turing machine, but stores the program and data in one memory space. Most modern computers use this style of storage. dia/commons/5/51/Magnetic_core. jpg

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1955: The transistor A transistor is a switch that can be very, very small. In the late 60s, the microchip. 1hair = 4,000 transistors

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Altair 8800: The first home computer. Spawned the BASIC programming language, and Microsoft. Very modular. Only differs from modern computers by IO.

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