public void FSUB(){
        pcIncrease();
        ComputeEffectiveAddress(); 
        getALU().OP2.set(getMBR().get());
        getALU().OP1.set(SelectFloatingRegister().get());
        getALU().sub();
        SelectFloatingRegister().set(getALU().RES.get());
        pause(MIDDLE);
        
    }