Using CHD Roms
For the most part, getting roms to run on an emulator is pretty much straight forward but every once in while, you will come across a rom that requires just a little more setup to get it running properly.
Such is the case with CHDs. Find out what CHDs are and how to set them up for your emulator of choice.
Find out if a CHD may be required for a game you want to play here: http://adb.arcadeitalia.net/download.php