void set_turbo_speed(double speed)
{
	save_turbo_speed(speed);

	if(display::get_singleton()) {
		display::get_singleton()->set_turbo_speed(speed);
	}
}
void set_turbo_speed(double speed)
{
	save_turbo_speed(speed);

	if(disp != NULL) {
		disp->set_turbo_speed(speed);
	}
}
void set_turbo_speed(display& disp, double speed)
{
	save_turbo_speed(speed);
	disp.set_turbo_speed(speed);
}