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Consider the 8085 instruction IN 09H stored as follows:

      Memory Address           Machine Code

             3050

             3051

                  DA

                  09

and the following incomplete timing diagram for the instruction:

gate2000-10

  1. Write the contents of the boxes, A, B, C and D in hexadecimal in your answer sheet. Do not draw any pictures.
  2. Write the state of both ALE and  $\overline{RD}$ pins at time units T1, T2, T3 and T4.
  3. How do you generate the signal that tells the peripheral to put the data on the bus? Answer by completing the following statement in your answer book:

    By combining signals.........
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