RealTime Lab 1 scan code int9

void interrupt interrupt_9_Implementation(){

    unsigned char scanCode;

    asm{

        in al, 60h          // read the keyboard input from port 60h ( 96 Decimal ) into al;
        mov scanCode, al    // save the keyboard input into 'scanCode' varaible
        in al, 61h          // read 8255 port 61h ( 97 Decimal ) into al
        or al, 128          // set the MSB - the keyboard acknowlege signal
        out 61h, al         // send the keyboard acknowlege signal from al
        xor al, 128         // unset the MSB - the keyboard acknowlege signal
        out 61h, al         // send the keyboard acknowlege signal from al
    }

    if( 128 > scanCode ){   // if the button is being pressed or being released. if the button is being pressed then the MSb isn't set and therfore it must be smaller than 128

        PromptFormattedString( FormattedString, scanCode, asciiTable[ scanCode ] );

        if( EscScanCode == scanCode )
            EscPressed = _True;
        else
            PromptMessage( PromptString );
    }

     //send EOI
    asm{
        mov al, 20h
        out 20h, al
    }
}