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The 8086 has 16 data bus lines and 20 address bus lines because that is how Intel designed it. They wanted a processor that was more powerful than the 8085, which has an 8 bit data bus and a 16 bit data bus, so they increased both bus sizes accordingly.

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Q: Why does microprocessor 8086 has 16 data bus and 20 address bus why aren't they equal?
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