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TSR Programming

Interchange letters Interchange letters on screen Unload TSR on key press-keyboard Unload TSR - timer interrupt Activate, deactivate TSR Print alphabet from printer Repeat key press Keep caps on Make ctrl, alt key pressed

Interrupt Programming

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Program to make Ctrl and Alt Key Pressed on a Key Press from Keyboard

 
 # include <dos.h>


 char far* CtrlAltPtr=(char far*)0x417;


 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( )
 {
    *CtrlAltPtr=0x0C;

    (*OldKeyboardInterruptFunction)( );
 }
[/Code]

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