> How does switching in and out of PAL mode work? Could we take advantage > of that somehow? I don't have a really good idea of how that might help. > I'm just throwing the idea out there. Basically, the callpal instruction is like a branch, but it also sets the mode bit (and enables the pal shadow registers and stores the return address in a different place). rti (return from interrupt, I think that's what it is called) is like a normal ret, but it undoes everything. We could certainly record somewhere the pal state. We don't have to only store it in the PC. It does need to remain in the PC though because my guess is that some of the PAL code would depend on that bit being there.
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