> As I recall, the Z80 had two sets of registers which allowed for a single
cycle
> context switch without interrupt handling overhead. I am not aware of
> anyone using it. =20

I use(d) it all the time! I've seen it other places too.

>I wonder if any of the current micro's have that type of architecture
> now days.

Many PICs have a subset of this where they have interrupt level copies of
registers distinct from the task-level codes.

-- Bob Ammerman
RAm Systems


--=20
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