I bought one of these recently, and have been testing it out on my AV Famicom. The majority of the NES games I've tried have worked; however, the following games won't (and this is after multiple cleanings of the converter, the games and the console):
Castlevania III (I knew about this one in advance, no big deal since I have Akumajo Densetsu)
The Guardian Legend
Super Dodge Ball
Double Dragon II
The Adventures of Dino Riki
Does anyone know of a compatibility list for these adaptors? I've searched, but have yet to find one.