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History of Computers by Mind Map: History of Computers
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History of Computers

Abacus

Used by the Babylonians in 300 BC

Basically rings that slide over a rod

First ever calculator

Used for Mathematical Problems.

Could do subtraction and addition

Logarithms

invented in 1617

allowed you to do multiplication

were a bunch of sticks with numbers

By John Napier

Stepped Reckoner

was able to add , multiply, subtract and divide

was considered the first to advicate the use of the binary system

invented by Gottfried Wilhelm Leibniz

instead of gears there wear 10 flute drums

Pascaline

invented in 1642

by a 19 year old named Blaise Pascal

didnt sell alot because the prices were too high

Could only add

had metal wheels

had digits 0 -9

Punch Cards

Frenchmen Joseph Marie Jacquard came up with the idea

wooden cards

really big in the mill industry

used on trains for puncards

in 1801

Analytic Engine

In 1822 , invented by mathematician Charles Babbage

device was large as a house and powered by 6 steam engines

punched paper could be used as a storage mechanism

Had a condtional statement : allows programs to acheive different results everytime its runned

Hollerith desk

made by Hollerith ,which consisted of a punch card reader that sensed the holes in the card and a large dial indicator that showed results of the count

Built the company IBM

punch cards were used to track

Mark 1

Built on a partnership between Harvard and IBM in 1944. U.S millitary needed a mechanical computer to do scientific calculations

weighed 5 tons , 500 miles of wires and 8 feet 11 inches tall

operatedon numbers that were 23 digits wide. Also could add and subtract and multiply and divide in less then 10 seconds.

a moth was found by Grace Hopper in the Mark 1 . Grace Hopper was a programmer for the Mark 1.

Z3

Built by Konrad Zuse in 1941

the first

ENIAC

was a all electronic digital computer

had more then 18,000 vacuum tubes and filled a room, to reprogram the ENIAC you would have to switch about 3000 cords