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The father of computing history: Charles Babbage

The father of computing history: Charles Babbage. by Anja Jentzsch jentzsch@inf.fu-berlin.de. Charles Babbage (1791 - 1871). born: 12/26/1791 son of a London banker Trinity College, Cambridge Lucasian Professorship Mathematician and Scientist. Difference Engine.

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The father of computing history: Charles Babbage

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  1. The father of computing history:Charles Babbage by Anja Jentzsch jentzsch@inf.fu-berlin.de

  2. Charles Babbage (1791 - 1871) • born: 12/26/1791 • son of a London banker • Trinity College, Cambridge • Lucasian Professorship • Mathematician and Scientist

  3. Difference Engine • 1822 plan for calculating and printing mathematical tables like they were used in the navy • using the method of difference, based on polynomial functions

  4. Difference Engine • 1822 design 6 decimal places with second-order difference • 1830 engine with 20 decimal places and a sixth-order difference • 1830 end of work on the difference engine because of a dispute with his chief engineer

  5. Analytical Engine • 1834 plans for an improved device, capable of calculating any mathematical function • increase of calculating speed • never completed

  6. Analytical Engine - Architecture • separation of storage and calculation: • store • mill • control of operations by microprogram: • control barrels • user program control using punched cards • operations cards • variable cards • number cards

  7. Analytical Engine • more than 200 columns of gear trains and number wheels • 16 column register (store 2 numbers) • 50 register columns, with 40 decimal digits of precision • counting apparatus to keep track of repetitions • cycle time: 2.5 seconds to transfer a number from the store to a register in the mill • addition: 3 seconds • conditional statements

  8. Analytical Engine

  9. First programmer – Ada Lovelace • Ada Lady Lovelace, daughter of Lord Byron, was working with Babbage on the Analytical Engine • first ideas of • algorithm representation • programming languages • already realized: • program loops • conditional statements

  10. Babbage’s meaning in history • John von Neumann (1903 - 1957): universal computing machine consisting of: • memory • input / output • arithmetic/logic unit (ALU) • control unit • based on Babbage‘s ideas • 95 % of modern computers are based on the von Neumann architecture

  11. Babbage’s meaning in history • Howard Aiken (1900 – 1973) developed the ASCC computer (Automatic Sequence Controlled Calculator) • could carry out five operations, addition, subtraction, multiplication, division and reference to previous results • Aiken was much influenced by Babbage's writings • he saw the ASCC computer as completing the task which Babbage had set out on but failed to complete

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