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Images of Computers

Topic 1. Images of Computers. A Brief History. Early records. 4,500 year old tax record. Early civilization used calculating devices for Business Taxes. A Brief History. Stonehenge – Built approximately 2800 BC Used to track equinoxes and solstices. A Brief History. Abacus.

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Images of Computers

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  1. Topic 1 Images of Computers

  2. A Brief History Early records 4,500 year old tax record • Early civilization used calculating devices for • Business • Taxes

  3. A Brief History Stonehenge – Built approximately 2800 BC Used to track equinoxes and solstices

  4. A Brief History Abacus Soviet Abacus • Invented by the Babylonians in 3,000 BC • Used by the Greeks and Romans • Used for calculations

  5. A Brief History Pascal’s Adding Machine (17th Century) Mechanical odometer Can add, subtract, multiply, and divide

  6. A Brief History Early Electronic computer ENIAC • Electronic Numerical Integrator And Computer (ENIAC) • Used 18,000 vacuum tubes • Used by U.S. Army to computer ballistic firing tables • Could add, subtract, divide, multiply, and square roots

  7. The Basics Mechanical relay Still used in cars and trucks Vacuum tube Rarely used anymore

  8. The Basics Transistors Integrated CircuitS

  9. The Basics First microprocessor 1971 Intel (4-bit) Intel xeon microprocessors

  10. The Basics Altair 8800 Bill gates wrote Basic programs for this system Xerox PARC (1972) First GUI

  11. The Basics Steve wozniak and steve jobs – built first ApplE computer In their garage Apple ii – the first computer system by Apple

  12. The Basics The circuit board for the first Apple Computers

  13. The Basics Apple – Lisa The first GUI from Apple It Failed because it was too expensive Apple – macintosh Very successful

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