Microprocessor
Ready pin of microprocessor is used

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

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Microprocessor
HLDA signal in 8085 performs the following operation:

 Hold the data in the accumulator until the microprocessor is turned OFF.
 Indicates that another master is requesting the use of the address and data buses.
 Indicates that the CPU has not received the HOLD request.
 Indicates that the CPU has received the HOLD request and that it will relinquish the bus in the next clock cycle.

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