History and development of computer


  • Abacus :-
    • it was a first machanical device developed in China
    • it was first counting machine.
    • It was used for addition/ subtraction,multiplication and division of  numbers
    • There  are many of beeds which are used to count the number

  • Pascaline Adding Machine
    • it developed by Blaise pascal and Pascaline in 1642
    • Blaise pascal develped a manual machine that was used for the simple addition and subtraction.this machine is called as 'Pascaline' or pascals'calculator
    • This machine with some wheels which count the numbers when the wheel rolls.
    • This machine is also used presently in many of the speedometers of the vehicals

  • Leibniz Calculator:
    • in 1671 invented a machanical device calles leibniz calc.
    • it was an improvisation of pascaline .
    • it can perform  add. sub.,multi,div and square root also.

  • Difference engine & Analytical engine
    • It was become the base of modern computer.
    • charles babbage invented a working model of the machanical computer.
    • it called a difference engine developed in 1822 
    • and analytical engine developed in 1833...this unit worked like a modern computer.

all the computer nowadays are based on them.


Tabulating machine
  • Developed by Herman Hollerith
  • Designed was controlled by the punched cards  it operated by the electricity.
  • Punch cards were used to store and record the instructions
  • Harman Hollerith  developed a machine for 'JanGarna' in 1890.
  • Further he established a company for developing the punch cards.
  • In 1924, this company was renamed as 'IBM'.
Howard Aiken and Mark-I
  • in 1944, He developed the first electro- mechanical machine which is named as 'Mark-I'.
  • This computer was made of 30 billians of electric connections.
  • It was capable of performing a mulitiplication in 6 seconds and a division in 12 seconds.
  • it was capable of executing long computation automatically
Atanasoff-Berry Computer :
  • In 1945, Atanasoff and Clifford Berry developed a electronic machine.
  •  It was called as ABC
  • It was the first Electronic Digital Computer
ENIAC (1943-46)-
  • ENIAC stands for Eloctronic Numerical Integrator And Calculator.
  • The size of this Computer was 20 * 40 sqr Feet.
  • It was comprised with 1800 vaccume tubes .
EDSAC (1947-49)
  • EDSAC stands for Electronic Delay Storage Autometic Calculator.
  • It was the first computer where the program was get executed.
  • The organization and structure of this computer was also similar to the ENIAC.
EDVAC
  • Electronic Discrete Variable Automatic Computer is a modern type of computer
  • it was John neumann who started the practice of storing data instruction in binary code
UNIVAC(1951)
  • UNIVAC stands for Universal Automatic Computer
  • It developed by j presper eckert and john mauchly
  • It was first digital computer that was used for business.
further IBM developed 701 Commercial Computer that was based on theory of UNIVAC.
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