UNIV4VINU | ENGINEERING ACHIEVERS

System Software- May / June – 2007

PART – A (10 X 2 =20 marks)

1. Define upward compatibility in systems.

2. Distinguish between direct addressing and indirect addressing.

3. Consider the following sequenceX WQU YY EQU ZZ RESW 1Is a two pass assembler can

resolve such a sequence of definition? Justify your answer.

4. What is the data structure used to organize the symbol table and operation code table

in a simple assembler Why it is preferred?

5. What are the advantages of dynamic linking?

6. What is the function of pass 2 of a loader?

7. What is the use of DEFTAB (Definition table) NAMTAB (Name table) and ARGTAB

(Argument table) in macro processor?

8. What is the purpose of conditional compilation statement in ANSI C preprocessor?

9. What are the tasks performed by document editing process?10. How the mapping of

view buffer to a window is done?

PART –B ( 5 X 16 = 80 marks)

11. (a) (i) Explain the SIC machine architecture. (Marks – 8)

(ii) Write a sequence of instruction for SIC to setVAL 1 = VAL 2 + INCR-2VAL 3 = VAL 4 +

INCR-2Illustrate how the same calculation could be performed of SIC/XE. (Marks -8)

Or

(b) (i) Explain the SIC/XE machine architecture. ( Marks – 8)

(ii) The variables V1, V2 and V3 are assumed as an array of 100 words each. Write a

sequence of instructions for SIC to add together the corresponding elements of V1, V2 and

store in V3. ( Marks – 8)

12. (a) (i) Write the algorithm for pass 1 assembler. ( Marks –10)

(ii) Explain program relocation with example. ( Marks – 6)

Or

(b) Explain in detail about the machine independent features of assemble. ( Marks – 16)

13. (a) Explain the design of relocating loader with an example. ( Marks – 16)

Or

(b) Write short notes on:(i) Linkage editor. (Marks -8)

(ii) Dynamic linking. (Marks -8)

14. (a) (i) Explain with an example how macro processor allows the invocation of macro