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The firsh generation computers were so expensive and uso so electricity. And it use the vacume tubes.
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The 2nd generation of computes were so similar to the 1st, but the difference is that it don't use vacum tubes, in orther they use the transitors.
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The third generation of computers was cheaper and used less energy than the first and second generation, and used an integrated system.
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The fourth generation is smaller uses less electricity. In addition, the fourth generation of computers uses a micro-processor.
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The fifth generation of computers is the most advanced of all. This type of computer will be available to all users in the future.