code: public void set_chip_model(chip_model model) {
  		if (model == chip_model.MOS6581) {
  			wave__ST = Wave.wave6581__ST;
  			wave_P_T = Wave.wave6581_P_T;
  			wave_PS_ = Wave.wave6581_PS_;
  			wave_PST = Wave.wave6581_PST;
  		} else {
  			wave__ST = Wave.wave8580__ST;
  			wave_P_T = Wave.wave8580_P_T;
  			wave_PS_ = Wave.wave8580_PS_;
  			wave_PST = Wave.wave8580_PST;
  		}
  	}
docs: Set chip model.
  
  @param model
  chip model