00000CS303121901

Pages: 3

Reg No.: Name:

Max. Marks: 100

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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Fifth semester B.Tech degree examinations (S) September 2020

Course Code: 3
Course Name: SYSTEM SOFTWARE

PARTA
Answer all questions, each carries 3 marks.
Distinguish between interpreter and compiler.
Explain how floating point numbers are represented in SIC/XE.
List the basic assembler functions.
Consider the statements in SIC program. Consider the program being assembled
using a 2 pass assembler.

Line 10 | Location

LENGTH | RESW 4
NEW WORD 3

What will be the address value assigned to the symbol NEW during pass 1?

PART ‏جا‎
‎Answer any two full questions, each carries 9 marks.
What is the difference between the instructions LDA #5 and LDA FIVE? Explain

how each instruction is executed.
Design an algorithm for pass | operations of a two pass assembler for SIC
architecture.
Compare the following with reference to SIC and SIC/XE machines:

i. | Memory

11. Instruction format
Suppose the address associated with the symbol RETADR is 0030 and the
machine equivalent code for STL is 14. Assemble the given SIC/XE instruction,
by clearly indicating the instruction format, addressing mode and the setting of

different flag bits, given the address value assigned to RETADR is 0030.

Location Opcode
0000 FIRST STL RETADR

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Duration: 3 Hours

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