Basically, I don' remember where, but I do remember reading once (in a magazine probably) that though there weren't any "banks" per se in 64 mode. that it was possible to simulate that somehow, or maybe even, with ASM, gain access to the 128's second bank.
Back then I doubted it because I didn't know better and though there was a seperate CPU for 64 and 128 mode. But now I tend to wonder because the 8502 is used in both modes.
So to those who happen to know, is this possible? To gain access to some extra ram (even while sacrificing a few things in the process?