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My Paper was :

Q1. if AX is pushed to stack in process of decrementing the stack, what will be the behavior of SP(Mrks 2)

Q2.Explan the Not Operation (Marks 3)

Q3.Operation of INterrupt ( Marks 5 )

Q4. Which shifting is called multiplied by 2 And Why ? (Marks 5)

Sorry friends ,i forget other 2questions .But no program or subroutine was included in my paper .




Pari Gul  thanks for sharing 

Brandon Lee thanks 

16 may 2012
1.two types of call?
2.Replace the following invalid instruction with the single valid instruction
a. (a)mov IP
b. (b)mov IP,L5
3.How 16-bit operations is different from 32-bit operation?
4.a program of subroutine with array(bubble sort) ?
5.write two prefixes for CMPS?
6.which instructions are used for insert and retrieve data from stack?

14 may 2012
All the mcqs were from past papers
Two 2 marks questions..


1.. What is wrong in the following instruction. Identify and write in alternative way.
mo DS, Ox 123


2.. How the 16-bit DIV operation is different from 32-bit DIV operation.?


Two 5 marks questions..


1.. Write an assembly language code for a bubble sort subrouting taking parameter from stack.


2.. Write an algorithm in which we write instructions in assembly language.

13 may 2012
Write a program in assembly language.display zero on whole screen doc???? 5 marks


Write a program in assembly for sort of two arry using bubble sort? Hint{call data two time}5 marks


How stack pointer move after push or put marks 2


How many bytes moved marks 2
a) Move cx,e84
Rep movesb
b) move cx,384
rep movsw

One More Paper of Cs401
1.two types of call?
2.Replace the following invalid instruction with the single valid instruction
a. (a)mov IP
b. (b)mov IP,L5
3.How 16-bit operations is different from 32-bit operation? 
4.a program of subroutine with array(bubble sort) ?
5.write two prefixes for CMPS?
6.which instructions are used for insert and retrieve data from stack?

CS401 Midterm Examz All Current papers in one thread Spring May 2012



which two registers contents are updated by the instruction “lds si, [bp+4] ? (2 mark)

how many parameter a subroutine can receive through stack? (2 mark)

which inturrept are generated as a result of : (3 mark)
dividing a number by zero.
If the trap flag is set.

How the value of stack pointer(sp) changes after every push and pop instruction? (3 mark)

identify only two prefixes which are meaningful with cmps instruction? Justify your answer. (5 mark)

what happen behind the scene when a character is displayed on the monitor screen? (5 mark)

paper date and time 20/05/2012 2:00 pm

1. How many parameters a subroutine can receive through a stack? 2 marks
2. Interrupt are asynchronous. “What is this mean”? 2 marks
3. How the value of stack pointer (SP) changes after every push or pop instruction? 3 marks
4. How 16 bit div operation is different from 32 bit div operation? 3 marks
5. W rite an assembly language program that displays zero (0) on the whole DOS screen. 5 marks
6. Suppose AL contain 11001011b and CF=1. Give the new content of AL after each of the following instruction is executed. Assume the preceding initial condition for each part of this question?
SHL AL, 1
a) SHR AL, 1
b) ROL AL,CL ; if CL contain 2
c) SAR AL,CL ;if CL contain 2 5 marks
BY ZAHEER AHMAD TOSEEF (MC110201216)


1. How many parameters a subroutine can receive through a stack? 2 marks
2. Interrupt are asynchronous. “What is this mean”? 2 marks
3. How the value of stack pointer (SP) changes after every push or pop instruction? 3 marks
4. How 16 bit div operation is different from 32 bit div operation? 3 marks
5. W rite an assembly language program that displays zero (0) on the whole DOS screen. 5 marks
6. Suppose AL contain 11001011b and CF=1. Give the new content of AL after each of the following instruction is executed. Assume the preceding initial condition for each part of this question?
SHL AL, 1
a) SHR AL, 1
b) ROL AL,CL ; if CL contain 2
c) SAR AL,CL ;if CL contain 2 5 marks

One More Paper of Cs401
1.two types of call?
2.Replace the following invalid instruction with the single valid instruction
a. (a)mov IP
b. (b)mov IP,L5
3.How 16-bit operations is different from 32-bit operation? 
4.a program of subroutine with array(bubble sort) ?
5.write two prefixes for CMPS?
6.which instructions are used for insert and retrieve data from stack?

 i m unable to solve two mcqs plz guide me which are correct options. plz anyone help mera paper hai tuesday ko plz help

1. If AX contains FFFFh, then after execution of instruction “SAL ax, 3”, the result will be
     a) -3
    b) +3
     c)  -8
    d)  +8

2.shifting the -15 two bit sAR
►-7
►-8
►7
►8

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