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beads on rods to count and calculate

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based on Napier's logic of logarithm

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First store program

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Stores numbers on metal punched paper

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use vacuum tubes with no air

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Grace hopper called it debugging the computer

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used silicon, won Nobel peace prize

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First fully complete digital computer

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2nd generation computer 1956-63  operating system 

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2nd generation computer 1956-63  operating system 

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replaced vacuum tubes with transistor

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it used integrated circuits

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had microchips

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256 bytes of memory

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used most in school

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First wide selling computer

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most homes had computers

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Great increase of memory and more