Microprocessor
In microprocessor based system I/O ports are used to interface

 all the I/O devices
 the I/O devices and memory chips
 the I/P device only
 the O/P devices only

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Microprocessor
Ready pin of microprocessor is used

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

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