121. 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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122. How many memory cells are there in a 128 × 4 memory chip?

1. 1. 128

   
   
   

   2. 512

   
   
   

   3. 4

   
   
   

   4. 1024

   
   
   

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1. View Hint View Answer Discuss in Forum

   512 No. of memory cells = 128 × 4 = 512

   Correct Option: B

   512 No. of memory cells = 128 × 4 = 512

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123. How many address lines are necessary to address 2MB of memory?
     

1. 1. 21

   
   
   

   2. 20

   
   
   

   3. 22

   
   
   

   4. 10

   
   
   

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1. View Hint View Answer Discuss in Forum

   21

   Correct Option: A

   21

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124. While executing a program, when the 8085 MPU completes the fetching of the machine code located at the memory address 2057 H, what is the content of the program counter?

1. 1. 2057 H

   
   
   

   2. 2056 H

   
   
   

   3. 2058 H

   
   
   

   4. 2059 H

   
   
   

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1. View Hint View Answer Discuss in Forum

   2058 H

   Correct Option: B

   2058 H

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125. How many address lines are used to identify an I/O port in the memory mapped I/O device?

1. 1. 2

   
   
   

   2. 8

   
   
   

   3. 4

   
   
   

   4. 16

   
   
   

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1. View Hint View Answer Discuss in Forum

   4

   Correct Option: C

   4

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