Sacado de la wikipedia,
The last update for Xbox 360 backwards compatibility in North America was on November 27, 2007,[1] raising the total number of Xbox games compatible with the Xbox 360 to 461.[1] Approximately 51% of the original Xbox library is now compatible with Xbox 360 (as of the November 27, 2007, update). The latest European update was in November, 2007,[citation needed] with a total of 476 compatible games. The latest update for Japan was released on November 28, 2007,[citation needed] with 122 working games.
No creo que exista más, microsoft se despreocupó del tema al par de años de salir x360.
