Microprocessor
The data bus of any microprocessor is always

 None
 Either unidirectional or bi-directional
 Unidirectional
 Bi-directional

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Microprocessor
Ready pin of microprocessor is used

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

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