81. In mode 1 of 8255, which of the following port provides for the handshake signals?

1. 1. Port A

   
   
   

   2. Port B

   
   
   

   3. Port C

   
   
   

   4. Port D

   
   
   

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   Port C

   Correct Option: C

   Port C

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82. 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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83. 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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84. 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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85. 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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