Group B
Lab 1 Dated: 21 February 2012
Name: ____________________________ Roll No:______________
Q:1 short Questions (for help use the file debug_tutorial.pdf)
1) command for finding help in debug environment
2) write down the valid commands for debugger with one example (in debug)
3) what is the command used to show the contents of memory
4) command to show only 16 bytes of memory, whose logical address is CS:IP
5) internal registers used for storing length of the program when we want to save the
file in the hard disk
6) extension used for saving the code file
7) command to change flag register
8) how you can compliment all the flag bits with the above command
Q:2
9) write the following assembly code in the debugger and answer the following
questions (donot change the contents of CS and IP)
mov al,ff
mov bl,01
add al,bl
nop
i) What is the logical address of 1st instruction:____________
ii) After the instruction execution “add al,bl” what is the changes in the flag
register, justify your answer
iii) What is the logical address of last instruction “nop”
iv) What is the command to append the following code after the above code
inc al
inc bl
add al,bl
nop
int 21
v) Last address of the instruction “int21”
vi) What the command u 100 does (provided 0100 is the contents of IP register)
vii) What is the difference between above command and u cs:100 10e
Q:3
1) Test the following procedure for saving above code file in hard disk and loading it
again (write the proper command format
r bx
r cx
n file name
w
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