Where does this information originate from? I didn't see a "blame" tool on the Wiki, nor a tool to easily find out when a certain part of page was last modified.NESDev wiki wrote:It was found recently that all banks, in the case of CHR RAM, are set to 0 on power up. More testing will be required to know if the same phenomenon happens for CHR ROM.
Obviously, MMC3 wouldn't care whether CHR ROM or CHR RAM is mapped in, so the behavior should be the same for both.
EDIT: Struck out because the question made no sense, wiki claimed the exact opposite.