History of computers

Abacus - calculation tool

Abacus was invented in between 1000 BC - 500 BC in Mesopotamia and China. An abacus is a calculation tool, constructed as a wooden frame with beads sliding on wires. The first abacus was based on a flat stone covered with sand or dust. Words and letters were drawn in the sand, eventually numbers were added and pebbles used to aid calculations.

Antikythera mechanismAntikythera mechanism• The Antikythera

mechanism is an ancient mechanical analog computer designed to calculate astronomical positions.

• 150-100 BC

• The device is about 33 cm (13 in) high, 17 cm (6.7 in) wide, and 9 cm (3.5 in) thick, made of bronze and originally mounted in a wooden frame.

1801: punched card technology1801: punched card technology

1820's Charles Babbage1820's Charles Babbage

1820's Charles 1820's Charles Babbage, in England Babbage, in England made a "difference made a "difference engine".engine".

• Yr 1939 - 1946

• Dr. Howard Aiken of Harvard completed the basic plans for a sequential, digital, electromechanical computer - Father of all modern computers

ENIAC  The World's First Electronic Computer ENIAC  The World's First Electronic Computer 

1949 - 19521949 - 1952

Electronic Numeric Integrated Electronic Numeric Integrated Automatic ComputerAutomatic Computer - - ENIACENIAC

weighed nearly 30 weighed nearly 30 tons and occupied tons and occupied 15,000 square feet 15,000 square feet of floor space.of floor space.

contained more than contained more than 19,000 vacuum 19,000 vacuum tubes which were tubes which were used to perform used to perform 5,000 additions per 5,000 additions per second second

It was the major It was the major instrument for the instrument for the computation of all computation of all ballistic tables for ballistic tables for the U.S. Army and the U.S. Army and Air Force Air Force

BINACBINAC

EDVACEDVAC

Altair-8800b-MITS- 1974 first Altair-8800b-MITS- 1974 first marketed Computermarketed Computer

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