Until ElSemi puts a cheat function in the best you can do is turn the difficulty down & use the codes for any hidden characters (should you wish to see them), or just try the games in Mame since they are playable now & there's cheats for that I guess
or you can use a memory search program like artmoney while there is no cheat support, the problem is that this emulator is well protected, i can't even find fixed pointers to the ram start
