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History of Computers Notes for Bank Exam

History of Computers Notes for Bank Exam  - Actually speaking electronic data processing does not go back more than just half a century i.e. they are in existence merely from early 1940’s. In early days when our ancestor used to reside in cave the counting was a problem. Still it is stated becoming difficult.

When they started using stone to count their animals or the possession they never knew that this day will lead to a computer of today. People today started following a set of procedure to perform calculation with these stones, which later led to creation of a digital counting device, which was the predecessor the first calculating device invented, was known as ABACUS.

THE ABACUS

abacus_notes
Abacus is known to be the first mechanical calculating device. Which was used to be performed addition and subtraction easily and speedily? This device was a first develop Ed by the Egyptians in the 10th century B.C, but it was given it final shape in the 12th century A.D. by the Chinese educationists.

Abacus is made up of wooden frame in which rod where fitted across with rounds beads sliding on the rod. It is dividing into two parts called ‘Heaven’ and ‘Earth’. Heaven was the upper part and Earth was the lower one. Thus any no. can be represented by placing the beads at proper place.

PASCAL’S CALCULATOR

Pascaline_calculator_Computer_NotesIn the year 1642, Blaise Pascal a French scientist invented an adding machine called Pascal’s calculator, which represents the position of digit with the help of gears in it.

LEIBNZ CALCULATOR

LEIBNZ _CALCULATOR_NotesIn the year 1671, a German mathematics, Gottfried Leibniz modified the Pascal calculator and he developed a machine which could perform various calculation based on multiplication and division as well.

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