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actually, what I ended up doing worked. There is no support for screen “rotation” in mame4allpi. You can only reverse the X and Y axes, which doesn’t help. I now use AdvMAME for all of my “screen flipping” ROMS, and use it’s own romset in it’s own directory. I then used the dipswitches in the menu, to pick cocktail, and the screen rotates between players.