tepples wrote:
Some of the later NES games may write to VROM for copy protection purposes: if a write takes, then the game must be an illegal copy. Earthbound is pretty heavily protected.
I tried to put breakpoints with FCEUXD to see that, but I saw nothing, for both the japaneese version and the american prototype. That would be stupid anyway, causing bus conflicts and an illegal copy can only use VROM due to how the game's graphics are organized, and even with a lot of romhacking stuff, the hacker could also discard this piece of code. (that would be a little less stupid with NROM games, because there is no CHR bankswitching, so they can run as well with VRAM).