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Interrupt Programming

Restart computer Conventional memory of sys Save IVT in file Print string-interrupt 21h Read char-interrupt 21h Read char with echo-interrupt 21h Delete file-interrupt 21h Delete directory-interrupt 21h Get set system date Show system configuration Search, delete file in dir Display multiple file in dir

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Program to print a String on the Screen using Interrupt 21h

 

Image

 # include <stdio.h>
 # include <conio.h>
 # include   <dos.h>


 void PrintString(const char*);


 int main( )
 {
    clrscr( );

    // $ Sign is used as NULL character in printing Strings using Interrupts
    PrintString(\"This Message is Print on Screen using Interrupt-$\");
    PrintString(\"21$\");
    PrintString(\"h and Service Number-$\");
    PrintString(\"9$\");
    PrintString(\".$\");

    getch( );
    return 0;
 }



 //-------------------------  PrintString( )  ----------------------------//


 void PrintString(const char* String)
 {
    union REGS InReg;
    union REGS OutReg;

    struct SREGS SegReg;

    InReg.h.ah=0x09;
    InReg.x.dx=FP_OFF(String);
    SegReg.ds=FP_SEG(String);

    int86x(0x21,&InReg,&OutReg,&SegReg);
 }

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