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The Computer-Key Developments
• Abacus-calculating device(3000BC)
Abacus-
• Is an ancient calculating device.
• First man made computing device.
• Is still being used in China, Russia and the Far-east countries for calculations.
Pascaline-mechanical adding machine(1642)
Pascaline-• is a desktop mechanical adding machine.
• This was developed by Blaise Pascal.
Punched cards-data storage(1800s)
Punched cards- • A card punched with holes in certain
places that a computer can read data coded from the combination of holes.
• This was first used by Joseph Jacquard to automate his weaving factory.
Analytical Engine-
• This was invented by Charles Babbage who is known as “the father of computers”.
• Designed to store one thousand 50 digit numbers for calculations and decisions.
Hollerith - Tabulating machine(1890s)
Tabulating machine-
• This was invented by Herman Hollerith to tabulate1890 US census (Poll) data.
• It was electrically powered and, used punched cards.
Free tutorials www.dailyict.com
Mark i-General purpose computer(1944)
Mark i-
• This was invented in 1944 by Dr.Howard Aiken.
• The idea is based on programmable, general purpose computer.
ENIAC-Electronic computer(1946)
ENIAC-• In 1946 John Mauchly and J.Presper
Eckert introduced the ENIAC as an electronic computing machine.
UNIVAC-US Census Department(1951)
UNIVAC-(UNIVAC-i)• It was developed and this is the first
commercial computer which got large amount of public attention.
UNIVAC Programming Team
EDVAC (Electronic Discrete Variable Automatic Computer)
Stored Program Concept(1951)
IBM-701(1953)
Apple II-First personnel computer(1977)
IBM-PC (1981)
Portable computers(1987)
