Computer History

4th Century B.C.
• The abacus, a simple counting aid, may have been invented in Babylonia (now Iraq) in the fourth century B.C.
• This device allows users to make computations using a system of sliding beads arranged on a rack.
BLAISE PASCAL
(1623 - 1662)
• In 1642, the French mathematician and philosopher Blaise Pascal invented a calculating device that would come to be called the "Adding Machine".
• One of the first and earliest mechanical devices used for calculating was the Pascaline
BLAISE PASCAL
(1623 - 1662)
• Originally called a "numerical wheel calculator" or the "Pascaline", Pascal's invention utilized a train of 8 moveable dials or cogs to add sums of up to 8 figures long. As one dial turned 10 notches - or a complete revolution - it mechanically turned the next dial.
• Pascal's mechanical Adding Machine automated the process of calculation. Although slow by modern standards, this machine did provide a fair degree of accuracy and speed.
• Only performed addition, not multiplication or division
Matiste 2015
Blaise Pascal
The stepped reckoner Supposed to be able to add, subtract, multiply, divide and calculate square roots **Device never worked properly
Gottfried Wilhelm von Leibniz
CHARLES BABBAGE
(1791 - 1871)
• Born in 1791, Charles Babbage was an English mathematician and professor.
• In 1822, he persuaded the British government to finance his design to build a machine that would calculate tables for logarithms. Called the “Difference Engine.”
• Device was to calculate numbers to 20th place and print them at 4 digits per minute.
• With Charles Babbage's creation of the "Analytical Engine", (1833) computers took the form of a general purpose machine.
Charles Babbage
1822 Babbage's Difference Engine
Analytical Engine
• 1833
• Used to perform a variety of calculations by following a set of instructions or programs stored on punch cards
• Machine only designed but never built
Joseph Jacquard
Charles Babbage
Considered the “Father of Computers”
First Computer Programmer
Ada Byron, Countess of Lovelace
Matiste...

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