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CS609 Assignment No 01 Spring 2020 Solution & Discussion

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Learn CS609 System Programmig with Washi - Solution of CS609 Assignment 1 Spring 2020

Link of Solution file is given below and in this video we make a c program which use the int 65h and switch on the Caps lock, Scroll Lock and Num Lock.

Solution Codes:

CS609 System Programming Assignment 1 Solution & Discussion Spring 2020

 Solution Idea cs609:


void interrupt (*oldint65)( );
void interrupt newint65(void);
char far *scr=(char far*) 0x00400017;
char st1[80] ={" Which toggle button you want to switch on: "};
char st2[80] ={" Press 1 for Caps Lock "};
char st3[80] ={" Press 2 for Scroll Lock "};
char st4[80] ={" Press 3 for Num Lock "};
char st5[80] ={" Press Key(1/2/3): "};
char msg1[80] ={" Caps Lock is On "};
char msg2[80] ={" Scroll Lock is On "};
char msg3[80] ={" Num Lock is On "};
int i=0;
void main()
oldint65 = getvect(0x65);
setvect(0x65, newint65);
keep(0, 1000);
void interrupt newint65( )
printf(" %s \n" , st1);
printf(" %s \n" , st2);
printf(" %s \n" , st3);
printf(" %s \n" , st4);
printf(" %s " , st5);
scanf("%d", &i);
switch (i)
case 1:
_DX=(unsigned int) msg1;
case 2:
_DX=(unsigned int) msg2;
case 3:
_DX=(unsigned int) msg3;

printf("Invalid key is press");

CS609 System Programming Assignment 1 Solution & Discussion Spring 2020

Semester: Spring 2020
CS609: System Programming
Assignment No. 01
Total Marks: 20
Due Date: May 27, 2020


Problem: Write C program to switch on any one of the toggle button i.e Caps Lock, Scroll Lock and Num Lock by taking any one input i.e 1,2 and 3 respectively. Using Switch Case Statement, switch on the appropriate toggle button and show message for that button. For example if the user enter 3 then Num Lock should be on and message should be displayed “Num Lock is On”. Store all the following 5 lines of strings in 5 array st1,st2,st3, st4, st5 and through interrupt 65H print proper message i.e Which toggle button you want to switch on:

Press 1 for Caps Lock
Press 2 for Scroll Lock
Press 3 for Num Lock
Press Key(1/2/3):

1) Include all header files and declare 5 string arrays for messages.
2) You should save interrupt 65H vector in a pointer to vector variable name oldint65 through
getvect instruction.
3) Call any new function i.e newint65( ) through setvect instruction.
4) Then use scanf to take input in an integer variable i.e scanf(“%d”, &i)
5) Place service number in AH register. Interrupt 65H will check its value and will perform
relevant function.
6) Interrupt 65H function must check for Service Number using Switch Statement.
8) Use keep() function to make this program TSR.
Note: Your assignment solution will be in this Word file (.doc or .docx) containing code of C

Did anyone run this solution program?

How can it be possible? I am unable to run C program even it compiles successfully.


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