Abacus
The vary first computing device.
Developed 5000 years ago.
Perform simple addition & subtraction.
John Napier’s Bone
A Scottish mathematician.
Created Logarithm tables.
Created a device (Napier’s Bone).
Designed in 17th century.
Used by accountants & Book keepers.
Blaise Pascal
A French mathematician.
In 1642 invented mechanical adding machine.
Pascaline Calculator.
Could only add & Subtract.
Von Leibniz
A German Scientist.
In 1694 developed a calculating machine.
Can multiply & divide also.
More reliable & accurate.
Charles Babbage
In 1822, he invented a difference engine.
In 1842, he developed analytical engine.
Perform 60 additions per minute.
Atanasoff
Professor at Lowa University.
Invented an electronic computer.
Applied Boolean Algebra to computer circuitry.
Mark 1 Computer(1937-44)
Automatic Sequence Controlled calculator.
1st fully automatic calculating machine.
Designed by Howard A.Aiken (Harvard University).
Very reliable but huge in size.
The ENIAC (1943-46)
Stands for Electronic Numerical Integrator & Calculator.
Invented by J.P.Eckert & John Mauchly (1946).
1st electronic computer.
Very heavy & large in size.
Consumed 140 kilo Watts of power.
Could perform 5000 additions per second.
The EDVAC (1946-52)
Stands for Electronic Discrete Variable Automatic Calculator.
Developed by Dr.John Von Neumann.
Could store instructions & data.
The UNIVAC (1951)
Stands for Universal Automatic Computer.
1st successful computer by Eckert & Mauchly.
1st computer for commercial use.
Manufactured for both scientific & commercial applications.