> The OS and Main is what's used to tell this as far as I know and they match the > version 2.0 in mame. The 2.0 and 2.3 probably come from rom labels of the program > roms. Anyway you should be able to upgrade your board to 2.3 if you replace the > program roms. You could probably dump them anyway if you have a programmer to check > if they flubbed an update by not updating the OS and Main code but I wouldn't mail > anything out based on this.
I don’t remember the MAME version having the word DEMO ONLY always floating in the picture (you can see it in my conquest screen I posted), but maybe this is a setting I need to turn off? The words DEMO ONLY are always on during fights.