Evolutions of computers:

MARK-I
In 1973 AD, Howard Aiken, professor of Haward university, developed an automatic calculating machine called Mark-I. It is also called Automatic sequence controlled calculator. It was the first electromechanical computer. It was huge in size and it had 18000 vaccuum tubes to store data in the memory. It used a program to guide it through a long series of calculations.

ABC
ABC is the short form of atanasoft berry computer. It was the first digital computer designed by Dr. John V. Atnasoft and his assistant Clifford Berry in 1942 AD. It used vacuum tubes as a main memory. This computer was designed for solving system of simultaneous lineare equations. This machine was mainly used by military to compute gun firing.

ENIAC
ENIAC stand s for a electronic Numerical Integratot And Calculator. It was the first electronic general purpose computer invented by john w. mauchly and john presper eckertt in 1946 AD. It was 10 feet tall and occupied a space of 30X30 feet it contained 18000 vacuum tubes as main memories it required about 150 kilowatts of power . it could perform many complex arithmetic operations in few seconds .

EDSAC
EDSAC stands for Electronic Delay Storage Automatic Computer. It was the first operational stored program computer. It was invented by mauxice Wilkes at Cambridge University, in 1949 AD. Itr contained 3000 vaccum tuves and it required 30 kilowatts of elecdtric power. In thies computer programs were input using paper tape and output results were printed on a teletype page printer.

UNIVAC
UNIVAC –I stands for universal Automatic Computers. It was developed by John Mauchly J.P. Eckert in 1951 AD. It was the first general purpose electronic digital Computer. This computer consisted of magnetic tape for data input and output. It had 10,000 vacuum tubes. This computer was used for data processing till 1963. in the USA…

EDVAC
EDVAC stands for electronic discrete variable automatic computer. it was designed by more school personnel and the ballistics research laboratory of the us army in 1952 AD. It was able to store programs. This concept was introduced by a Hungarian mathematician john von Newmann.
Over the centuries the development of computing and calculating have been changed dramatically .in this way. The ancient abacus has now taken the form of modern PCs, laptop and palmtops. The computer science is still in never stopping progress….