Wow. A Zelda 1 proto? That sounds like it would be highly sought after.

When I first saw the thread, I signed up because I wanted to inquire into purchasing Arkista's Ring. But now that I think about it, this could yield a  byte-for-byte copy of existing files, nevermind noticeable changes when playing. That's a nail-biter. How much are you asking for that cart's rom?

Mind you, I understand how the information getting out there that prototype X *is* byte for byte the same would devalue it. But in such a case, the purchaser wouldn't even have the physical cart to put in a collection. Big risk, especially for $850 Megaman 2. :^/