56. Which is the pin that is utilized for differentiating I/O and memory operations?

1. 1. 31

   
   
   

   2. 32

   
   
   

   3. 33

   
   
   

   4. 34

   
   
   

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1. View Hint View Answer Discuss in Forum

   34 IO/M: For IO it is set to high and for memory operations it is low

   Correct Option: D

   34 IO/M: For IO it is set to high and for memory operations it is low

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57. Which of the following is an example of implicit addressing?

1. 1. CMA

   
   
   

   2. MVI A, 05

   
   
   

   3. Both (A) and (B)

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   CMA The instruction does not require any operand

   Correct Option: A

   CMA The instruction does not require any operand

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58. If the memory chip size is 256 × 1 bits, how many chips are required to make up 1 K (1024) bytes of memory?

1. 1. 8 chips

   
   
   

   2. 32 chips

   
   
   

   3. 16 chips

   
   
   

   4. chips

   
   
   

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1. View Hint View Answer Discuss in Forum

   32 chips
   

   1024′ 1	= 32
   256′ 1

   Correct Option: B

   32 chips
   

   1024′ 1	= 32
   256′ 1

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59. If the 8085 MPU adds 87H and 79H, what will be the contents of the accumulator?

1. 1. OOH

   
   
   

   2. 99 H

   
   
   

   3. 100 H

   
   
   

   4. 01 H

   
   
   

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1. View Hint View Answer Discuss in Forum

   OOH 87 + 79 = 100 H
   ⇒ Accumulator will have OOH

   Correct Option: A

   OOH 87 + 79 = 100 H
   ⇒ Accumulator will have OOH

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60. The memory address of last location of an 8 KB memory chip is FFFFH. Find the starting address—

1. 1. FOOOH

   
   
   

   2. EOO1 H

   
   
   

   3. EOOO H

   
   
   

   4. FOO1 H

   
   
   

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1. View Hint View Answer Discuss in Forum

   EOOO H

   Correct Option: C

   EOOO H

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