sanni i have exactly same idea about sram saves implementation, but user should be press reset after paly or something like this for copy saves from sdram to sd. also i will try to use fast serial F-RAM for emulate sram, but i not sure that speed will be enough fast.
i would say the hardest part of making everdrive 64 is the security chip, but if any one can do it , you can igor , i am hoping that it is taz express compatible . lets hope.
I think you might be forgetting the European version of Paper Mario? I have posted the below list in another thread, but thought it might be helpful here:- List of N64 games larger than 256Mbit 320Mbit Ogre Battle 64: Person of Lordly Caliber Paper Mario (U) & (J) 512Mbit Paper Mario (E) Conker's Bad Fur Day Pokemon Stadium 2 Resident Evil 2 512Mbit Unreleased Legend of Zelda: Ocarina of Time Master Quest Debug Version Legend of Zelda: Majora's Mask Debug Version
but any of this games or not use sram save or has enough unused space in tail of rom for use this area for save mapping