ர 00000CS303121902 Pages: 3

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth Semester B.Tech Degree Regular and Supplementary Examination December 2020

Course Code: CS303
Course Name: SYSTEM SOFTWARE
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries3 marks. Marks

1 How is system software different from application software? (3)
2 Why is the displacement field of PC related addressing mode interpreted as 12 bit (3)

signed integer?

Describe the functions of two passes of a simple two pass assembler. (3)
4 Assemble the following instruction indicating the instruction formats used: (3)

a. RMO S,A

b. +JSUB RDREC

௦. LDA #1

Assume that the value of RDREC is 1036.

OPTAB

Opcode

PART 13
Answer any two full questions, each carries9 marks.
5 9) Explain the architecture of an SIC machine. (5)

b) Write an SIC/XE program to add the elements of an array ALPHA of 100 words (4)
and store the result in GAMMA.
6 9) With the help of an example explain the use of BASE assembler directive. (4)

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