> > For simulation, W was being sent to RAM pointed at by FSR0.

> I'm not sure what you're saying here, as the FSRs point to data
> memory not program memory

Correct. What I was saying is that in an MPLAB simulation, instead
of going to the LCD routine, data from program memory was being
sent to RAM, via POSTINC0, so I could see it in a Watch window

> Whatever was going on is worth investigating since this smells like
> a bug you don't want to cover up then have it bite you when you've
> forgotten all about it later

Very true, and I do not like string and sticky-tape fixes. The 'bug'
is/was actually in MPLAB (currently 7.50 installed). It does appear
to lose a marble or two from time to time. Not often, perhaps once
a month, especally after heavy use. This evening happened to be
one of those times. A re-boot always puts it right. I don't think it's
the PC, although it is about time this one had a good clean out, as
these anomolies also happen on a much less used PC as well

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