26. Specify the bit of the CW for 8255, which differentiates between the I/O mode and the BSR mode?
    

1. 1. D₇

   
   
   

   2. D₆

   
   
   

   3. D₃

   
   
   

   4. D_O

   
   
   

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   D₇

   Correct Option: A

   D₇

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27. What will be BSR control word if PC₇ is to be set to 1?
    

1. 1. OF H

   
   
   

   2. OE H

   
   
   

   3. 07 H

   
   
   

   4. 06 H

   
   
   

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   OF H

   Correct Option: A

   OF H

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28. If all the ports of 8255 are programmed as O/P ports in mode 1, the CW will be—

1. 1. A 4 H

   
   
   

   2. 84 H

   
   
   

   3. AO H

   
   
   

   4. 80 H

   
   
   

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   A4 H

   Correct Option: A

   A4 H

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29. What will be the CW when ports of Intel 8255 are operating as follows: port A and PC as I/P in mode 0 and port B, Clow as O/P in mode 0?

1. 1. 98 H

   
   
   

   2. 18 H

   
   
   

   3. 88 H

   
   
   

   4. 90 H

   
   
   

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   98 H

   Correct Option: A

   98 H

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30. Which of the following can be used as a multipurpose programmable device?

1. 1. Intel 8155

   
   
   

   2. Intel 8255

   
   
   

   3. Intel 8251

   
   
   

   4. Intel 8237

   
   
   

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   Intel 8155

   Correct Option: A

   Intel 8155

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