As we have seen that since its inception computer has been evolved a lot for the last couple of decades. In earlier days a computer was such a big machine that required space like a complete room and hence its maintenance cost was very much far away from a common man. A common man could not have thought to have a computer for his personal use. But now-a-days one in every three person is using computer in one way or the other. From bulky machine to as small as like a SIM card, this is possible because of the ever changing technological world. The old adage “Necessity is the mother of inventions” holds true for computer also because computers are invented as a result of man’s search for fast, accurate and reliable calculating devices. The Evolution of Computers is defined in terms of various eras. Let us take a look of them :
A) MANUAL ERA :
The earliest device that qualifies as a digital computer is the ‘Abacus’. This device allows the user to represent numbers by the position of beads on a rack. Simple addition and subtraction can be carried out rapidly and efficiently by positioning the beads on the rack appropriately. Although Abacus was invented around 600 B.C. and was used by the Chinese and Egyptians, it is still being used in Far East. Another manual calculating device to speed up the multiplication process was John Napier’s bone or Cardboard Multiplication Calculator developed by Scottish man named John Napier. A complete set of Napier bone’s consists of rods , one for each of the digit 0 to 9 called bones, with number carried on them. It was designed in the 17th Century and they first appeared in print in 1614.
B) MECHANICAL ERA :
The first mechanical calculator was developed by Wilhelm Schickhard , a professor at the University of Tubingen. In 1642, the young French philosopher and mathematician Blaise Pascal developed another mechanical adding machine called Pascaline, which could add and subtract numbers. Learning Objectives : After learning the Unit the students will be able to:
learn about the various inventions in computers
understand the technological changes occurs in computer in terms of hardware and software
identify and classify computers in its various categories
understand the basic difference between various types of computers
differentiate computers according to the way they process data, according to their size and the function performed.
Pascaline used a system of gears and wheels.
Later in year 1671 Baron Gottfried Wilhelm Von Leibiniz of Germany developed a similar mechanical calculator that could also perform multiplication and division. In early 19th Century a Frenchman Joseph Jacquard invented a loom that used punched cards to automatically control the manufacturing of patterned cloth.
Charles Babbage , a 19th Century professor at Cambridge University, is considered to be the Father of Modern Digital Computers.
Babbage designed a Difference Engine in year 1822, which was capable of performing automatic multistep calculation and can produced reliable mathematical and statistical tables automatically.
In the year 1842, Babbage conceived the new idea of Analytical Engine, that was intended to be completely automatic. It was capable of performing the basic arithmetic functions for any mathematical problem at an average speed of 60 additions per minute.
The Analytical Engine incorporated many features of modern computers including punched card instructions, internal memory , an arithmetic unit to perform calculation any many other number of principals which have been shown to be fundamental to the design of any digital computer.
Analytical Engine was programmable and in order to write program Babbage employed ada Augusta Lovelace (daughter of poet Lord Byron) , who became the first programmer in the world.
In the late 19th century a young statistician Harmen Hollerith, the inventor of Punched Card Tabulating Machine , used it for processing Census data. Later in 1911, by merging several other firms, he formed IBM Corporation. In 20th Century, under the direction of George Stibitz of Bell Telephone Laboratories, five large scale computer were developed by using Electromechanical Relays and were called as Bell Relay Computers. These computers were capable to perform calculations with a high speed and accuracy. The Mark-I computer, the world first general purpose mechanical digital computer was developed by Howard H. Aiken, a professor of Physics at Harvard University, in collaboration with IBM. Its designed was based on he technique already developed for punched card machinery. This machine was also known as Automatic Sequence Controlled Calculator, and may be regarded as the first realization of Babbages’ Analytical Engine.
C) ELECTRONIC ERA :
The first electronic computer using 45 vacuum tubes (valves) for internal logic and capacitors for storage and having the concept of binary system was developed by John Vincent Atanasoff and his assistant Clifford Berry in 1939.
This prototype of automatic electronic calculator was known as Atanasoff-Berry Computer or ABC, capable of solving variables with a high degree of accuracy.
In 1946, an all electronic version of Mark-I called Electronic Numerical Integrator And Calculator (ENIAC) was developed by J. Presper Eckert and John W. Mauchly at the University of Pennsylvania, USA. It was the first large scale fully electronic computer installed at Marryland to cater the military need. The basic behind the stored program digital computers was developed by Dr. John Von Neumann. And in 1952 by using the concepts of stored program, John Von Neumann with his collaborator H.H. Goldsteine designed Electronic Discrete Variable Automatic Calculator (EDVAC). It was John Von Neumann who introduced the idea od storing both instructions and data in the binary form.
Analytical Engine was programmable and in order to write program Babbage employed ada Augusta Lovelace (daughter of poet Lord Byron) , who became the first programmer in the world.
In 1949, at Cambridge University, a group of British Scientists headed by professor Maurice Wilkes developed Electronic Delay Storage Automatic Calculator (EDSAC), that was capable of performing Addition operation in 1500 microseconds and multiplication operation in 4000 microseconds. The UNIversal Automatic Computer (UNIAC) was first digital computer, produced by many companies like IBM, Universal Accounting Company, General Electronic Corporation etc . It was first commercial large scale digital computer produced in 1951.
During the period of late 1940’s and early 1950’s many other stored program computers like JOHNIAC, MANIAC, ILLIAC etc were developed.