Also if you have any doubts you can check the ROMS on the mame.dk website. They have a complete history of most (all?) of the MAME roms. I recently built a cabinet and used the .37b9 version of MAME and the .61 version ROM sets. Of course some of my games wouldn't run. The ones that wouldnt run I researched on mame.dk and sure enough, the roms had changed. MAME.DK is an excellent resource, check it out for kickarse ROM info.