Microprocessor
Ready pin of microprocessor is used

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

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Microprocessor
PUSH B instruction in 8085 microprocessor causes

 the contents of registers B & C to be transferred in the stack and and the registers get cleared
 registers B & C to be cleared
 the contents of register B only to be copied in the stack
 the contents of register B & C to be copied in the stack

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