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3000 BC
Beads on a stick used for counting

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1630 AD
Based on Napier's rule on Logarithms.

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1801 AD
First stored program - mental cards

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1822 - 1833
- Difference Engine
- Analytical Engine - stored numbers on a metal punch cards, accurate to 6 decimal places, powered by steam.

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1941-1956
1st generation computers used vacuum Tubes with no air inside to protect circuiry

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1941 - 1956
Programmed UNIVAC Recipient of Computer Science's first "Man of the Year Award

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1945
Moth stuck in relay switch. Grace Hopper called it

debugging a computer

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1948
Used silicon, won

Nobel prize, on-off switch.

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Does the first transistor ever built still work?

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1951
First fully electronic digital computer built in the U.S., Created at the University of Pennsylvania, weighted 30 tons, contained18,000 vacuum tubes. Costed $487,000.

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1956 -1963
2nd Generation computers replaced vacuum tubes with

transistors.

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1956 -1963
Instructions for a

computer that are loaded each time the computer is turned on

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1964-71

3rd Generation computers used Integrated Circuits that were

made of transistors, resistors, and capacitators integrated into

one chip.

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1971
4th Generation computers had

microchips. Intel 4004 Microchip had 2,250 transistors .

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Apple iPod touch 4th Generation 2010 Review

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1975
- 256 bytes of memory
- 2 MHz Intel 8080 chip
- Cost $395-$495

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1977
Released Apple II computer that was used in most schools.

First commercial computer with Graphic User Interface GUI and Mouse.

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1981
-First wide selling personal computer
- 8088 Microchip 29,000 transistors
- 1 or 2 floppy disk drives

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- Computers in most homes
- Faster and less expensive
- Windows 95 was 1st decent GUI

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Cell Phones & Wireless Technology

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Educational tablet takes classrooms into the 21st century