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Abacus
The Abacus was invented in 3000 B.C.E . You can use this device for counting , by moving the beads different directions to get your anwser .
http://commons.wikimedia.org/wiki/File:Abacus_2.jpg
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Pascaline
The Pascaline was invinted by a French man named Blaise Pascal in the year 1645 . The Pascaline was meant to look like the first calculator . This machine didn't work well , because the parts didn't work all the time . This was still a part in history .
http://commons.wikimedia.org/wiki/File:Pascalina.jpg
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Stepped Reckoner
Giottfried Wilhem Leibnitz had the idea of making a Stepped Reckoner 1674 , but his idea didn't work until 1791 ,do to the parts . He was dead by then . When it did come out it could solve all four symbols in math .
http://en.m.wikipedia.org/wiki/File:Leibniz_Stepped_Reckoner.png
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Charles Babbage
Charles Babbage lived from 1791 - 1871 . He was known as the Father of Computers . He created the Difference Engine . The way this worked was , when you turned a handle the answer showed up.
http://commons.wikimedia.org/wiki/File:CharlesBabbage.jpg
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Jacquards Loom ( Punched Cards )
The Punched cards were invented in 1804 by Joseph - Marie Jacquard . The cards were put into the machine , and the punched cards told the machine what to weave .
http://ko.fotopedia.com/items/jXFDHkHfrKU-czUBqXEuV-0
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Lady Augusta Ada Countess of Lovelace
Lord Byron ' s daughter Lady Augusta was a mathematician . The limits of computers were proved by her . She was also known as the first computer programer .
http://commons.wikimedia.org/wiki/File:Ada_lovelace.jpg
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Electronic Tabulating Machine
The Electronic Tabulating Machine was invented by Herman Hollerith . The purpose was to calculate the Census data . Later , the mechanical parts in the machine were replaced with electronic ones .
https://commons.wikimedia.org/wiki/File:Hollerith.jpg
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Alan Turning
Alan Turning lived from 1912 - 1954 . He once wrote a paper stating that a computer process using ones and zeros . This machine was capable of solving any problem .
http://commons.wikimedia.org/wiki/File:Alan_Turing_Aged_16.jpg
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The Atanasoff - Berry Computer ( ABC )
The Atanasoff - Berry Computer was called ABC , and was invented by John Vincent Atanasoff and Clifford Berry . This was the first electronic didital computer .
http://commons.wikimedia.org/wiki/File:Atanasoff-Berry_Computer_at_Durhum_Center.jpg
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John Von Neumann
John Von Neumann was a mathematican and he worked at Princeton ' s Institute of Advanced Study . One of his greatest inventions was that he would store the Primary Memory in the computer and the computer would get the information from itself . This was a great help because it solved problems quicker and eaiser .
http://commons.wikimedia.org/wiki/File:JohnvonNeumann-
LosAlamos.gif
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Bletchley Park ' s Colossus
The Bletchley Park ' s Colossus was invented in 1943 which was durning World War Two . This was a transferring machine that would crack the German Enigma Machine codes .
http://commons.wikimedia.org/wiki/File:Colossus.jpg
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Dr . Grace Murray Hopper
Dr . Grace Murray Hopper discovered the first computer bug . This is how the computer bug came about . One day when the computer gave wrong anwsers , Dr . Grace looked closer , and she found a moth in one of the vacuum tubes . After she took it out the anwsers were correct . Now , when people are having problems with their computer they call it the computer bug .
http://commons.wikimedia.org/wiki/File:Grace_Hopper.jpg
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ENIAC
The ENIAC which contained lots of vacuum tubes , was built in 1946 by two men named John Presper Eckert and John Mauchly . Before 1970 this was the first computer . The reason that it is the second computer now , is one night they went to dinner with John Vincent and discussed their plans . Later , the ENIAC inventors took John Vincent ' s plans .
http://commons.wikimedia.org/wiki/File:Eniac.jpg
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Vacuum tubes ( first Generation of Computers )
Vacuum tubes devolped between 1951 - 1958 . These vacuum tubes were used in radios , computers , and the ENIAC . The problem was , the vacuum tubes would get hot , unreiable , they would burn out , and they were very big .
https://commons.wikimedia.org/wiki/File:Elektronenroehren-
auswahl.jpg
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Transistor ( second Generation of Computers )
The second generation of computers were devolped between 1959 - 1964 . Between these years , transistors made computers smaller , faster , cheaper , and more trustworthy . Example : IBM Model 650
http://en.wikipedia.org/wiki/File:IBM_PC_5150.jpg
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Intergrated circuit ( third Generation of Computers )
The third generation of computers devoleped between 1965 - 1970 , and used integrated circuits . As each year passes , the computers get smaller , faster , cheaper , and more trustworthy . Example : IBM System 360
http://commons.wikimedia.org/wiki/File:IBM_system_360.JPG
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Microprocessor ( fourth generation of computers )
The fourth generation of computers were devoleped in the early 1970 ' s . They used the microprocessor and integrated circuits to make the computers faster , smaller , cheaper , and more trustworthy . Example : PC .
http://en.wikipedia.org/wiki/File:MacBook_Air.jpg
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Harvard' s Mark 1
Howard Aiken invented the Harvard" s Mark 1 . This is often called ( ASCC ) . It is short for Automatic Sequence Controlled Calculator . Most people think it is a computer , But it is just a calculator .
http://commons.wikimedia.org/wiki/File:Harvard_Mark_I_Computr_-_Left_Segment.jpg
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