VTU SS Lab Viva Questions

Hii sir, I wants to get the questions that are Asked during the VIVA of the System Software Lab Examination of the VTU university

[Kiran Chandar]

As you asking for the questions that are Asked during the VIVA of the System Software Lab Examination of the VTU the question with Ans is given below

. Define system software.
It consists of variety of programs that supports the operation of the
computer. This software makes it possible for the user to focus on the other problems to be solved with out needing to know how the machine works internally.
Eg: operating system, assembler, loader.


2. Give some applications of operating system.
• to make the computer easier to use
• to manage the resources in computer
• process management
• data and memory management
• to provide security to the user.
Operating system acts as an interface between the user and the system
Eg:windows,linux,unix,dos

3. Define compiler and interpreter.
Compiler is a set of program which converts the whole high level
language program to machine language program. Interpreter is a set of programs which converts high level language program to machine
language program line by line.
4. Define loader.
Loader is a set of program that loads the machine language translated by the translator into the main memory and makes it ready for execution.

5. What is the need of MAR register?
MAR (memory address register) is used to store the address of the
memory from which the data is to be read or to which the data is to be written.
6. Draw SS instruction format.
opcode L B1 D1 B2 D2
0 7 8 15 16 19 20 31 32 35 36 47
It is a 6 byte instruction used to move L+I bytes data fro the storage
location1 to the storage location2.
Storage location1 = D1+[B1]
Storage location2 = D2+[B2]
Eg: MOV 60,400(3),500(4)
7. Give any two differences between base relative addressing and program counter
relative addressing used in SIC/XE.

8. Define indirect addressing
In the case of immediate addressing the operand field gives the memory
location. The word from the given address is fetched and it gives the address of the operand.
Eg:ADD R5, [600]

Here the second operand is given in indirect addressing mode. First the word in memory location 600 is fetched and which will give the address of the operand.
9. Define immediate addressing.
In this addressing mode the operand value is given directly. There is no need to refer memory. The immediate addressing is indicated by the prefix ‘#’.
Eg: ADD #5
In this instruction one operand is in accumulator and the second operand is an immediate value the value 5 is directly added with the accumulator content and the result is stored in accumulator.

10. List out any two CISC and RISC machine.
CISC –Power PC, Cray T3E
RISC – VAX,Pentium Pro architecture

11. Following is a memory configuration:
Address Value Register R
1 5 5
5 7
6 5