HISTORY OF COMPUTER

HISTORY OF COMPUTER

WHAT IS COMPUTER?

• an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.

Abacus (-2500BC)

• The abacus was invented in Babylonia in 2400 B.C. The abacus in the form we are most familiar with was first used in China in around 500 B.C. It used to perform basic arithmetic operations. multiply, divide and calculate square and cube roots by moving the rods around and placing them in specially constructed boards.

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ABACUS (-2500 BC)

The abacus was invented in Babylonia in 2400 B.C. The abacus in the form we are most familiar with was first used in China in around 500 B.C. It used to perform basic arithmetic operations. multiply, divide and calculate square and cube roots by moving the rods around and placing them in specially constructed boards.

ABACUS (2500 BC)

It used to perform basic arithmetic operations. multiply, divide and calculate square and cube roots by moving the rods around and placing them in specially constructed boards.

ABACUS (2500 BC)

The standard abacus can be used to perform addition, subtraction, division and multiplication; the abacus can also be used to extract square-roots and cubic roots. The beads are manipulated with either the index finger or the thumb of one hand.

NAPIER'S BONE (2500 BC)

• Napier's bones is a manually-operated calculating device created by John Napier of Merchiston, Scotland for the calculation of products and quotients of numbers. The method was based on lattice multiplication, and also called 'rabdology', a word invented by Napier.

Slide Rule (1600AD)

Slide Rule (1600AD)

• The slide rule, also known colloquially in the United States as a slipstick,^[1][2] is a mechanical analog computer.^{[3][4][5][6][7]} As graphical analog calculators, slide rules are closely related to nomograms, but the former are used for general calculations, whereas the latter are used for application-specific computations.

• The slide rule is used primarily for multiplication and division, and also for functions such as exponents, roots, logarithms, and trigonometry, but typically not for addition or subtraction. Though similar in name and appearance to a standard ruler, the slide rule is not meant to be used for measuring length or drawing straight lines.

PASCAL MECHANICAL CALCULATOR (1600)

PASCAL MECHANICAL CALCULATOR

• or Numerical wheel calculator:-Blaise Pascal (1623 -1664)

  in 1642 invented the first adding machine called Pascaline. The brass rectangular box used eight moveable dials

  to add and sum up of eight figures long using base 10. It can perform all the four arithmetic operation with

  previous unheard speed