Microprocessor
At the beginning of a fetch cycle, the contents of the program counter are

 transferred to address bus.
 incremented by one.
 transferred to memory data register.
 transferred to memory address register .

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Microprocessor
Ready pin of microprocessor is used

 to indicate that microprocessor is ready to receive inputs
 to indicate that microprocessor is ready to receive outputs
 to introduce wait state
 to provide direct memory access

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