Before 1944

3000 B.C

Invention of the abacus.

1500

Mechanical calculator invented by Leonardo da Vinci.

1621

Slide rule invented.

1640

Blaise Pascal invents the Arithmetic Machine.

1800

First punch cards for storing data invented by Jacquard.

1822

Charles Babbage invents the Difference Engine.

1830

Charles Babbage invents the Analytical Engine.

1857

Sir Charles Wheatstone uses paper tape to store data.

1926

First patent for semiconductor transistor.

1936

Dvorak keyboard created.

1937

Alan Turing invents the Turing Test.

1940

Konrad Zuse completes the first fully functioning electro-mechanical computer of the world.

1943

First electronic general purpose computer: ENIAC

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