OK. now I have Mame v.1059. I used RomCenter to find my good roms and many of them work. However, some of the ones marked good don't. The program says it just references files with a database and doesn't check them entirely. So, is it standard practice to test the good games to be sure they work? I'm only looking for about 75 good games, so that's not too much trouble.
Also, some games have another green icon that looks more like a keyhole. What's that all about? Also, dude, I'm sorry i'm so dumb at this. I'm reading posts and the wiki and trying to learn something, but the Web is such a great source for information and misinformation that it's tough.