public static extern bool PlayM4_SetDisplayCallBack(int nPort, DISPLAYCBFUN DisplayCBFun);
public static extern bool PlayM4_SetDisplayCallBack(int nPort, DISPLAYCBFUN DisplayCBFun);
public static extern bool PlayM4_SetDisplayCallBack(int nPort, DISPLAYCBFUN DisplayCBFun);
public static extern bool PlayM4_SetDisplayCallBack(int nPort, DISPLAYCBFUN DisplayCBFun);