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‎APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2018
Course Code: CS303
Course Name: SYSTEM SOFTWARE

‎Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries 3 marks. Marks
1 Write a sequence of instructions for SIC to set ALPHA = BETA*9+GAMMA. (3)
2 List out the various registers used in SIC along with their purpose. (3)
3 What is meant by forward reference? How it is resolved by two pass assembler? (3)
4 Write down the format of Modification record. Describe each field with the help (3)
of an example.
PART B
Answer any two full questions, each carries 9 marks.
5 What are the various addressing modes supported by SIC/XE? With the help of (9)
an example, explain how to find target address during assembling in each case.
6 ஐ Distinguish between Application software and System Software (3)
b) Let A,B & C are arrays of 10 words each. Write a SIC/XE program to add the (6)
corresponding elements of A & B and store the result in C.
7 9) What are the functions of Operating System? (3)
b) With the aid of an algorithm explain the Second pass of a Two Pass Assembler. (6)
PART C
Answer all questions, each carries 3 marks.
8 What are control sections? What is the advantage of using them? (3)
9 Given an idle computer with no programs in memory, how do we get things (3)
started?

‎10 What are the uses of assembler directives EXTDEF and EXTREF? (3)
11 What is the use of bitmask in program relocation? (3)
PART D
Answer any two full questions, each carries 9 marks.

‎12 a) Distinguish between Program Blocks and Control Section (2)

‎b) How the assembler handles multiple Program blocks? (7)
13 a) Write short note on Dynamic Linking (3)

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