Which among the following occurs during the first clock cycle of machine state.

Which among the following occurs during the first clock cycle of machine state by allowing address to get latched into on-chip peripherals?

a. ADO-7
b. ALE (Output)
c. HLDA (Output)
d. INTA (Output)

Correct Answer : b. ALE (Output)

Explanation :

Address Latch Enable (ALE) gives the status information whose falling edge gives the complete information of hold & set times for address information. Apart from these, ADO-7 is a multiplexed form of address & data bus that is normally tri-stated during hold & halt times. HLDA stands for hold acknowledge that shows the reception of hold request at CPU so as to give up the buses in the next clock cycle. Similarly, INTA is an interrupt acknowledge used to activate interrupt chip or port.