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A bus is a collection of wires
carrying information
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with
a common purpose.
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For
each read or write operation, the CPU specifies
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the
location of the data or instruction by placing an
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address
on the address bus, then activates a signal on
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the control bus indicating whether the
operation is
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read
or write.
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Read operations retrieve a byte of data from memory
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at
the location specified and place it on the data bus.
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CPU
reads the data and places it in one of its internal
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registers.
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Write operations put data from CPU on the data bus
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and
store it in the location specified.
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