> The ROM we have only supports cocktail mode. An upright cabinet would need a > different ROM. I think some people came up with a hack that disables screen flipping > that you could apply as a cheat or ROM patch.
On some games of this era, the trick to select between cocktail or non-cocktail mode on actual hardware is a DIP switch or jumper hardwired to gate off the screen inversion control. I haven't verified whether or not that could be the case here.