MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -The first calculating device that was invented was the Abacus. It is a manual calculating device that consists of rows of beads representing a place of value and digits. The abacus was invented by Blaise Pascal in the year 1642.

Detailed explanation-2: -Ancient Mesopotamians of Sumeria invented Abacus between and BC.

Detailed explanation-3: -So human civilization invented the abacus, which the Computer History Museum suggests is “the oldest continuously used calculating tool aside from fingers.” Though still in use in today, the abacus was merely the beginning of mankind’s interest in calculating machines, which have evolved radically over the years.

Detailed explanation-4: -The abacus (plural abaci or abacuses), also called a counting frame, is a calculating tool which has been used since ancient times. It was used in the ancient Near East, Europe, China, and Russia, millennia before the adoption of the Hindu-Arabic numeral system. The exact origin of the abacus has not yet emerged.

Detailed explanation-5: -Abacus was the first calculating device. It was invented about 5000 years ago in china. Simple calculations like addition and subtraction could be performed using Abacus.