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    Which instruction is employed in the implementation of hardware interrupts?
    
    
    
	40. Which instruction is employed in the implementation of hardware interrupts?
    
      - SIM (Set interrupt mask)
 
      - RIM (Read interrupt mask)
 
      - EL (Enable interrupt)
 
      - HLT (Halt and enter wait state)
 
    
    Answer: A) SIM (Set interrupt mask)
    Explanation:
    SIM (Set interrupt mask) instruction is employed in the implementation of hardware interrupts (RST 7.5, RST6.5, RST5.5)