1.2 History of computer

ABACUS:

Abacus most old calculating device was invented around 3000 B.C. Abacus perform simple arithmetic operations.


PASCAL

ARITHMETIC ENGINE:
In 1642 A.D., the famous French mathematician Blaise Pascal invented a device called Arithmetic engine. This was the first successful mechanical calculator.

PUNCHED CARD MACHINE

In 1801 a French weaver Joseph Marie Jacquard invented the first card machine. Jacquard was involved in designing cloths and making patterns.

CHARLES BABBAGE ANALYTICAL ENGINE:

Charles Babbage proposed a calculating machine in 1823 it is called Charles Babbage “Difference Engine”.
In 1833 Charles Babbage modified the Difference Engine , the modified calculating machine which he called as analytical Engine. It is close to the similar concept in modern computer. Due to this reason Charles Babbage is known as “Father of modern digital computer”.

THE FIRST ELECTRONIC COMPUTER-ABC

Dr. Jhon Vincent Atanasoff and Clifford berry developed the first computer and called it as -ABC . This used vacuum tubes for storage and arithmetic and logical function.

ELECTRONIC NUMERICAL INTEGRATOR AND CALCULATER- ENIAC

The ENIAC computer is went in operation in 1940 in U.S Army .instruction were given to the computer by external plug boards or switches.
MICROPROCESSORS
The Microprocessors chip INTEL 4004 was developed in 1969 by INTEL Corporation.

PERSONAL COMPUTER

The first Personal computer (With Microprocessors) was developed in 1947 .In 1977 the first successful micro computer (PC) was developed by a young Technician named Steve Wozniak .This was called the computer Apple -1

POWER PC 600/PENTIUM

IBM, Apple computers and Motorola cooperated in designing a microprocessor called power PC 600 series. Intel also designed a powerful chip in 90s called Pentium (1993). Microprocessors such as Pentium, power PC, Celeron, AMD, IBM, ATHLON, ZELOG, CYREX, etc. are being used as CPU of PC’s (1995).