hello everyone I am sorry if this sounds like a stupid question but can somebody please explain this to me. I am trying to make a mapper 140 out of an GNROM cart. It is to make Bashi Bazook. Thi is a line from amother page and I am not exactly sure how to do this... Placing the bank register in $6000-$7FFF instead of $8000-$FFFF gives mapper 140. can some please explain this as I am not to savy on bank switching but would love to learn thank you all in advance.