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Program to interchange the Small and Capital Letters and Unload the TSR after 10 seconds using Timer Interrupt

Posted By: Easy Tutor     Category: C Programming     Views: 1725

Write a Program to interchange the Small and Capital Letters and Unload the TSR after 10 seconds using Timer Interrupt.

Code for Program to interchange the Small and Capital Letters and Unload the TSR after 10 seconds using Timer Interrupt in C Programming

# include <dos.h>

 int iCounter=0;

 void interrupt (*OldPrinterInterruptFunction)( );
 void interrupt NewPrinterInterruptFunction( );

 void interrupt (*OldTimerInterruptFunction)( );
 void interrupt NewTimerInterruptFunction( );

 int main( )
 {
    OldPrinterInterruptFunction=getvect(0x17);
    setvect(0x17,NewPrinterInterruptFunction);

    OldTimerInterruptFunction=getvect(0x08);
    setvect(0x08,NewTimerInterruptFunction);

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

    return 0;
 }

 /*************************************************************************///------------------  NewPrinterInterruptFunction( )  -------------------///*************************************************************************/void interrupt NewPrinterInterruptFunction( )
 {
    if(_AH==0x00)
    {
       if(_AL>='a' && _AL<='z')
      _AL-=32;

       elseif(_AL>='A' && _AL<='Z')
      _AL+=32;
    }

    (*OldPrinterInterruptFunction)( );
 }

 /*************************************************************************///--------------------  NewTimerInterruptFunction( )  -------------------///*************************************************************************/void interrupt NewTimerInterruptFunction( )
 {
    iCounter++;

    if(iCounter==182)
    {
       setvect(0x08,OldTimerInterruptFunction);
       setvect(0x17,OldPrinterInterruptFunction);

       freemem(_psp);
    }

    (*OldTimerInterruptFunction)( );
 }
  
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Easy Tutor
Easy Tutor author of Program to interchange the Small and Capital Letters and Unload the TSR after 10 seconds using Timer Interrupt is from United States. Easy Tutor says

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