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.
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.
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.