Computer-Stages of Development

Presented by:

Amina Rafique

Abacus

The mother of our modern computers was probably Chinese abacus.

The early Chinese abacus was a simple frame with six beaded strings.

Napier Bones

In early seventeenth century a mathematician from Scotland invented an advanced calculating system called the Napier Bones.

This device was made from carved bones, it could also multiply and divide.

The First Calculator

• In 1642 a French mathematician, Pascal, invented the first mechanical calculating machine which renamed “The Pascaline”

• This machine could add and subtract at very high speed.

Arithmetic Replica

• This calculating machine was invented in Germany by a German mathematician.

• This machine was a modified version of Pascaline.

• This machine could divide and multiply as well as add and subtract.

The Analytical & Differential computer

• The fast mechanical computer was invented by Prof.Charles Babbages.

• He is also known as father of computers.

• Both his machines could perform all arithmetical calculations.

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