Abacus history of computer

 The Abacus 

(Abundant Beads, Addition and Calculation Utility Systems) 

The earliest and the simplest device that was used for calculations was the Abacus. 

Simple Abacus has been in use since 3000 B.C Abacus was first developed in 

china and later its use spread to all part of the world. Even today, it is still used in many countries in like soviet Union, Japan, China and other countries in far-east. It was the first device to introduce the concept of data-storage. Abacus is a clay board with number of beads that are placed on rods (or) wires. The beads are moved from one side to another for counting