Regarding the mappers: There's another project called the Powerpak, which is essentially an FPGA programmable flash cart. You can put it in your nintendo, and

Regarding the mappers: There's another project called the Powerpak, which is essentially an FPGA programmable flash cart. You can put it in your nintendo, and it will allow you to play nintendo roms stored on a CF card. What might help you about this, I think, is that the mappers are loaded dynamically off the card. So this allows the creator of it to add support for more mappers as time goes by. I don't know if this would help you, but maybe you could use this for your own project as well? After all, if your FPGA nes is the same as a normal nes, then you could use an FPGA flash cart to load all your games. At the very least, maybe looking at the mappers would help you out. http://www.retrousb.com/product_info.php?products_id=34 http://www.retrousb.com/product_info.php?products_id=34