my english is not the best,but i try to explain my problem.
i think,i followed the instructions exatly.i have unzipped the mameboy zip and clicked on the em500 button.then i coppied mameboy folder to my em500 into my documents.i tried it also in the programm folder and on mmc card.but the roms i have coppied dont work.i have coppied the unzipped roms to the roms folder like you explained before in the forum.i tried it with 1942rom 105k,ckong 33,6k,galaga