> Am I correct in assuming that if you write code that is greater that 1
> page, then you must duplicate the ISR in both pages anyway - regardless
> of whether my ISR changes PCLATH.

my experience - as limited as it is at the moment - is that having the
ISR in page 0 seems to be ok - but I ran into needing to not only save
PCLATH and clearing bit 3, but I had to save STATUS and clear the RP0 bit
as well - which was kind of a trick until I discovered that I could use
FSR for STATUS storage since FSR appears in both pages...