Stuff using those retrozone carts use a proprietary version of the MMC4 chip for their unique UNROM board I think I saw written over at NA. Due to that, your standard dumping methods supposedly won't work for homebrews using that. I'm not certain what they have if it's the same or not on the clearly warez stuff like the VRC hack of Gradius 2 or Donkey Kong Orig Ed. If someone can't hack up a way to do it and share with Hyperkin it probably won't happen because there's no way bunny is going to give them the information they need as it's competition with the HDMI NES he's cooking up, and the Hyperkin will cost less too due to its emulation/cart dump design.

I agree with bsnes aka higen though to a point, don't understand what byuu was thinking on that, let alone jumping multisystem in the first place. Bsnes was accurate and while it could be slow a decent modern computer could run the stuff right, but damn once he went multi-system the bloat took it into the crapper. I've tried using higen but I can't even get 60fps on chipped games at all on this i5core 2410-M laptop with 6GB of ram and a intel hd 3000 chip. I don't mind using the clean .sfc format because those old smc super magicard headers suck. Dropping .NES format headers is asinine though as they're fine.