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TSR Programming

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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 repeat every Key Press event three times

 
 # include <dos.h>


 void interrupt (*OldKeyboardInterruptFunction)( );
 void interrupt NewKeyboardInterruptFunction( );


 int main( )
 {
    OldKeyboardInterruptFunction=getvect(0x09);
    setvect(0x09,NewKeyboardInterruptFunction);

    keep(0,(_SS+(_SP/16)-_psp));

    return 0;
 }



 //-------------------  NewKeyboardInterruptFunction( )  -----------------//


 void interrupt NewKeyboardInterruptFunction( )
 {
    (*OldKeyboardInterruptFunction)( );
    (*OldKeyboardInterruptFunction)( );
    (*OldKeyboardInterruptFunction)( );
 }

[/Code]

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