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- Made by vacun tubes
- Very large
- Expensive
- Require huge amount of electricity
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- Made by transitors
- Smaller
- Cheaper
- Faster
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- Made by integrated circuits
- Smaller
- Cheaper
- Faster
- Less elctricity
- Fewer mistakes
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- Micropocecors ( small chips with thousand of circuits)
- Smaller
- Portable
- Cheaper
- Less electricity
- Fewer heat
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- Scientist are trying develop
- Thing on their own
- Artificial intelligence (ROBOTS)