> I'm not sure what you are referring to.  My bootloader owns
> locations 0-3
> and some 300 word block usually near the end of memory.
> There is also a
> "known" app start address somewhere, like at the start of the
> second code
> page.  The app owns everything else, including the interrupt
> vector.  The
> bootloader deliberately uses programmed I/O so that the
> interrupt vector
> isn't a conflict.

Your basic assumption is that the application will be writting with your
bootloader in mind. My assumption is that an application, written for a
bare PIC, should also run with my bootloader, as long as it does not
occupy the top X instructions. For most (non-assembler) users that is a
condition which is easier to satisfy than a replaced start (and
interrupt) vector. (A basic basic user might not even know what those
two things are.)

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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