I search for a place where I could store the cart id of the last played game.
So that when you turn the Neo Myth on, it will automatily backup the nsram and save it under that cartid. Then when you start another game I could let it auto load it's save without worrying about overwriting an other games save.
I can't use the upper half of the nsram because it would be overwritten when playing a game from bank 4. I don't want to write it to the U2 menu area, because it will unnecessary wear it with time.
The psram will lose the info without power.
So there is either the gba sram or the gba menu area left.
I would prefer the menu area but someone could have flashed an MF version of the menu there. So all comes down to the gbasram again

Or could you tell me an offset in the gbamenu area where I can savely write without killing the MF menu, if there is one flashed?