April 1999
CS202: COMPUTER ARCHITECTURE AND DATA COMMUNICATION

QUESTION 1 (Compulsory)

Total Marks: 20 Marks

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SAMPLE STUDENT'S SOLUTIONS
for Question 1

 
(a) Define the following terms:
(i) MBR [1]
(ii) MAR [1]
(iii) SP [1]
(iv) PC [1]
(v) DMA [1]
(vi) CPU

 

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(b) What is the importance of a Program Status Word (PSW) or Status Register (SR)?

 

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(c) List four devices commonly found in a network, and explain the purpose of each.

 

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(d) For the following instruction mnemonics, identify the appropriate addressing modes: [3]
(i) ADD AX, 10
(ii) ADD AX [BX + 3]
(iii) MOV AX [VAR]

 
(e) To operation

      ADD ACC, MEM

uses the ALU to add the value stored in the accumulator to the value that is stored in the memory location specified in the instruction, storing the result in the accumulator. Show the steps of the execution cycle on the operation.

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