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Program to interchange the Small and Captial Letters on the screen after every 5th second and Unload the TSR on a Delete Key Press

Posted By: Easy Tutor     Category: C Programming     Views: 1965

A C Program to interchange the Small and Captial Letters on the screen after every 5th second and Unload the TSR on a Delete Key Press.

Code for Program to interchange the Small and Captial Letters on the screen after every 5th second and Unload the TSR on a Delete Key Press in C Programming


 # include <dos.h>


 char far* ScreenPtr=(char far*)0xB8000000;
 int InterruptCounter=0;


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

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


 int main( )
 {
    OldTimerInterruptFunction=getvect(0x08);
    setvect(0x08,NewTimerInterruptFunction);

    OldKeyboardInterruptFunction=getvect(0x09);
    setvect(0x09,NewKeyboardInterruptFunction);

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

    return 0;
 }


 /*************************************************************************///-------------------  NewTimerInterruptFunction( )  --------------------///*************************************************************************/void interrupt NewTimerInterruptFunction( )
 {
    int count;

    InterruptCounter++;

    if(InterruptCounter==91)
    {
       for(count=0;count<4000;count+=2)
       {
      if(ScreenPtr[count]>='A' && ScreenPtr[count]<='Z')
         ScreenPtr[count]+=32;

      elseif(ScreenPtr[count]>='a' && ScreenPtr[count]<='z')
         ScreenPtr[count]-=32;
       }

       InterruptCounter=0;
    }

    (*OldTimerInterruptFunction)( );
 }

 /*************************************************************************///------------------  NewKeyboardInterruptFunction( )  ------------------///*************************************************************************/void interrupt NewKeyboardInterruptFunction( )
 {
    if(inportb(0x60)==30)
    {
       setvect(0x08,OldTimerInterruptFunction);
       setvect(0x09,OldKeyboardInterruptFunction);

       freemem(_psp);
    }

    (*OldKeyboardInterruptFunction)( );
 }
[/Code]
  
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Easy Tutor
Easy Tutor author of Program to interchange the Small and Captial Letters on the screen after every 5th second and Unload the TSR on a Delete Key Press is from United States. Easy Tutor says

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