> Tony, That is really interesting code. Correct me if I'm wrong but the ISR
> can't see what the PC was before the interrupt can it? Can you read the
> stack? Scenix has a shadow register that stores the w, PC and something on a
> int IIRC. Reduces interrupt latency? Does the '877 have such a thing?
> Undocumented?

I doubt that the code can do anything useful except load and read RAM
registers inside the ISR.

As far as I know the F series do not have auto context save and stack
manipulation, although 'I think' the 18C series do???

--
Best regards

Tony

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