I have a question. I have an upright cabinet running on a PC with a newer version of MAME. In that version, if I set a "non-cocktail" game to cocktail mode, it mirrors the screen in a split so both players see there own "copy of the screen". I am now building a mini cocktail cabinet and would like to use the pi. I am unable to find these options in either mame4all or advancemame settings. Does anybody know how to do it?
Have you considered a hardware solution like using a passive or powered HDMI splitter? E.g., http://www.monoprice.com/Product?c_id=101&cp_id=10113&cs_id=1011301&p_id=10249&seq=1&format=2
Cocktail games you can set to cocktail mode with the virtual DIP switches in mame4all, but I haven't seen the option to do do it with non-cocktail games.