Microprocessor
A microprocessor without the interrupt facility

 cannot be used for DMA operation
 is best suited for process control system
 cannot be interfaced with any I/O devices
 is not useful for process control system

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Microprocessor
Ready pin of microprocessor is used

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

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