So my cabinet is
1/3 1/2 done, attract mode is working, MAME is working, but I want one other emulator, Bally Astrocade, but I'm not sure how to setup in attract mode, particularly the command arguments. I'm not sure what to put there, and if I need to do something in the messui. right now, everything I try seems to load MESS for a second and the return to attract mode. I can mount a game in messui, and play it in MESS, so....please help!

google AI finally got it right...
astrocade -cart "[rompath]/[name].zip"
Now onto LEDblinky