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History of Computers

Mrs Smith, OHS

Liz Smith

on 4 September 2014

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Transcript of History of Computers

Computer Programming I
The History of Computers

1970 LSI Large Scale Integration—in 1965 chip has 1000 circuits, now has 15,000 circuits on single silicon chip

1971 Intel Microprocessor chip – CPU of a microcomputer all on 1 integrated chip

1983 Hello Apple IIe

1987 80386 IBM popular personal computer
Generations of Computers
Fourth Generation (1970-late 80’s)

Developed transistor to replace vacuum tubes

Increased main storage capacity

Increased speed and reliability; reduction in size and heat generation

Calculations in microsecond (1/1,000,000 of a second)

COBOL and FORTRAN developed
Generations of Computers
Second Generation (1959-1963)

Computer History
Internet Site

Integrated circuitry stored on chips
IBM System 360 first machine to merge science and business
Flexible with input and output; disk oriented
Communication between computers
Software programs sold with computer
Calculations in nanosecond ( a billionth of a second)
Applications: airline reservations, credit card billing
Generations of Computers
Third Generation (1964-1970)
1946 ENIAC
Electronic Numerical Integrator & Computer
Mauchly and Eckert
Weighs 30 tons, 18,000 vacuum tubes and takes 30-by-50 foot space; first time turned on, lights dim in Philadelphia

EDVAC/EDSAC 1945 Stored program concept

1951 UNIVAC1
1st commercially available electronic digital computer: basic record keeping

Slow processing: millisecond (1/1,000 of a second)
Generations of Computers
First Generation (1940-1958)

Early 1600’s
Napier’s Bones –strips of wood or bones; slide “bones” up and down, in effect adding or subtracting numbers in a series to perform multiplication or division
Translated into Slide Rule—remained in use for over 300 years
John Napier
History of Computers
1880 census required
7 1/2 years to tabulate
Commissioned by government to reduce time to process census data
Hollerith card was
80-column punched card for data processing
Increased population of
3 million reduced census calc time to 2 1/2 years
Herman Hollerith
1642 Pascaline
Developed the first real mechanical calculator to add and subtract numbers using a series of 8 rotating wheels (odometer)
Used to help his father count money
Scandal in 1658 when won contest using fake name
Blaise Pascal
Developed Pascal’s ideas and in 1671 created Stepped Reckoner to add, subtract, multiply, divide and square roots
Machine ran mechanically as gears turned
Thought “excellent men” should not work like slaves doing calculations
Gottfried von Leibnitz
Create a Timeline
January - December
Get into groups by birth month.
Stand up.
Form a line alphabetically across the
room based on the First Letter of your
favorite video game.

Group 1: 1940's
Group 2: 1950's
Group 3: 1960's
Group 4: 1970's
Group 5: 1980's
Group 6: 1990's
Group 7: 2000's
Group 8: Future
Full transcript