History Of Computers:

Earliest Computer:

• Originally calculations were computed by humans,whose job title was computers.
• These human computers were typically engaged in the calculation of a mathematical expression.
• The calculations of this period were specialized and expensive, requiring years of training in mathematics.
• The first use of the word "computer" was recorded in 1613, referring to a person who carried out calculations, or computations, and the word continued to be used in that sense until the middle of the 20th century.

Tally Sticks:

A tally stick was an ancient memory aid device to record and document numbers, quantities, or even messages.

Abacus:

• An abacus is a mechanical device used to aid an individual in performing mathematical calculations.
• 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.


Early Abacus

Modern Abacus

Napier�s Bones:

• Invented by John Napier in 1614.
• Allowed the operator to multiply, divide and calculate square and cube roots by moving the rods around and placing them in specially constructed boards.