18F2420, instant interrupts, and TMR0

[Darrel Taylor]

Try changing OSCCON=%11111110 to OSCCON=%11111100. The internal osc is the primary osc in this configuration since you have it set in your config option. I.E. the intrnal osc is now considered the primary oscillator.

WOW!

I'd searched, and re-searched and could not find a reason.

But looking at FIGURE 2-8 (Clock diagram)
I can totally see how that makes a difference.

Nice Bruce!