The term Computer comes from the English language computer, which means calculation. Although initially the use of computers was used especially for calculative works, now its work area has increased greatly. Therefore, the computer is an electronic device that processes information based on the set of instructions. This directive group is called program. Thus, it is not only a calculator, but it is a tool to process mathematical and non-mathematical all types of information.
(i) In 1642, Blaise Pascal created the world’s first Mechanical Calculator. This is also called Pascalene.
(ii) In 1833, British scientist Charles Babbage envisaged an automatic calculator i.e. computer first time. But despite the tireless efforts of 40 years, they could not make it. He is called Father of Modern Computer. Also the credit for doing the first computer program ầATT goes to his disciple Eda Augusta Lovelace. They named the computer program in the name of the app – ADA.
(iii) In 1880, Hermann Hollerith realized the concept of Babbage. He made an electronic tabulating machine, which normally used to do all the work automatically with the help of punch cards. The invention of punch card by Harmon Hollerith contributed immensely to the development of the computer. This punch card is still used on the computers today.
(iv) In 1937 Howard Auckin created the first mechanical computers Mark I.
(v) During World War II (1939-45) the rapid growth of computer science has grown. After World War II, all the major principles of modern computers were developed.
(vi) The first revolution in the field of the calculation machine came in 1946 when J.P. Eckert and John Mosley invented the world’s the first electronic computers ENIAC-I (Electronic Numerical Integrator and Calculator). In this case, the electronic valve or vacuum tube was used as a switch.
(vii) Most of the development in computer development is by John W. Newman. John Van Newman gave correct direction to the computer revolution in 1951 (Second Revolution). He invented the EDVAC (Electronic Discrete variable Automatic Computers). In this, he used the stored program. The credit for the use of the binary system for the work of computers also goes to him.
Classified based on their size and methodology.
Classifications based on size:
Generally, There are four types on the basis of size. These are-
These are computers used by virtually the same person, which is why these computers are often used by personal computers or PCs. (P.C.). They can come on a small table. This type of computer is used in offices, homes or businesses. Due to its capacity to maintain a large capacity of storage capacity and quantity, it is being widely used today.
These types of computers are also small in terms of size and functionality. Such types of computers can come on a big table and can be worked together on twenty-thirty terminals. However, It is about 5 to 50 times the capacity of the microcomputer.
Main Frame Computers:
This type also is of a large size and is designed by putting it in a steel frame. Its memory is more than PC and Mini Computer. Many people, sometimes more than 100 people can work on different terminals simultaneously with time sharing and multitasking on these types of computers.
Supercomputers are very powerful. They also perform very complex operations at very rapid pace. Their storage capacity is also high. A supercomputer is by far the fastest and most expensive.