Hello there, fellow arcade gamers. I have a strange puzzle that I need some input on (if possible). I run a late version of Groovymame under the WAH!Cade frontend, outputting to a CRT arcade monitor. MAME games all work, and the frontend is setup, and all seems good. HOWEVER! There are a set of games (all by the same manufacturer! - IREM Corp) which run at a lower than normal refresh rate (55Hz) while most other games are 60Hz. My problem is that when I run any of these IREM games (Eg: Battle Chopper, Hammering Harry, Ninja Spirit), the game starts, but the picture is all distorted. I can see the game running, but it's completely out of sync. I've obviously tried adjusting the monitor POTS, but this does not help (at all). What even MORE strange, is that I exit the game, then re-load it, it sometimes syncs perfectly, and is fully running without a problem. Once I exit and open it up again, the same problem returns (out of sync / garbles graphics). This is really driving me insane, but I'm sure someone has seen this before. It could be possible that I don't have enough modelines setup, but GROOVYMAME is supposed to take care of this by itself. Is there anyone with this issue, or could anyone suggest anything I could try ?
Thanks for reading.