11. Specify the output at PORT1, after the following program has been executed—
    

    MVI	B, 82 H
    MOV	A, B
    MOV	C, A
    MVI	D, 37 H
    DUT	PORT 1
    HLT

1. 1. 82 H

   
   
   

   2. OO H

   
   
   

   3. 37 H

   
   
   

   4. FF H

   
   
   

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1. View Hint View Answer Discuss in Forum

   82 H
   ∵ Out PORT command outputs the data whatever is present in Accumulator.

   Correct Option: A

   82 H
   ∵ Out PORT command outputs the data whatever is present in Accumulator.

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12. What will be the O/P, if the following program is executed?
    

    MVI	A, OO H
    DCR	A
    OUT	PORT 1
    HLT

1. 1. OOH

   
   
   

   2. FF H

   
   
   

   3. OOH with CY = 1

   
   
   

   4. Error

   
   
   

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1. View Hint View Answer Discuss in Forum

   FF H
   

   Correct Option: B

   FF H
   

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13. What operation can be performed by using the instruction SUBA?

1. 1. Clear the accumulator

   
   
   

   2. Subtract A with borrow

   
   
   

   3. Subtract A

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   Clear the accumulator Q The command subtracts the contents of register specified from the accumulator
   

   Correct Option: A

   Clear the accumulator Q The command subtracts the contents of register specified from the accumulator
   

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14. Specify the contents of register A after the execution of following program—
    

    MVI	A, F8 H
    SUI	69 H
    HLT

1. 1. F8 H

   
   
   

   2. 8F H

   
   
   

   3. 69 H

   
   
   

   4. 96 H

   
   
   

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1. View Hint View Answer Discuss in Forum

   8FH
   A: 1111 1000
   69: 0110 1001
   
   1001 1111: 8 F

   Correct Option: B

   8FH
   A: 1111 1000
   69: 0110 1001
   
   1001 1111: 8 F

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15. Which of the following is commonly used to interface I/P devices?

1. 1. Latch

   
   
   

   2. Tri-state buffer

   
   
   

   3. Both (A) and (B)

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Tri-state buffer

   Correct Option: B

   Tri-state buffer

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