Probably better to enable it too by default
* Some Megadrive models (as some MD2) need it to prevent some possible (but very rare) Z80 corruption bugs
* (may happen when Z80 access the main BUS during IO port access from 68K).
*/
-#define HALT_Z80_ON_IO 0
+#define HALT_Z80_ON_IO 1
/**
* \brief
