opl 0.9 mode:
Mode 1 - Loads an alternate EE core at a higher address (may fix games that freeze on a green screen)
Mode 2 - Uses an alternative read method
Mode 3 - Unhook syscalls. (similar to HDL's mode3)
Mode 4 - skip PSS file reads ( bypasses the loading of many FMVs)
Mode 5 - Disables DVD9 support
Mode 6 - Disables IGR (In Game Reset)
Mode 7 - Unused(opl 0.9 中被取消的mode!!)
Mode 8 - Hide dev9 module (fix for NFS:U2)