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The code could also be changed thus, not that it makes a difference:


T1PS = 1 ; start with 1:1 postscaler
TimerConst = ((OSC*1000000)/4/100)+8 ; how many timer ticks...

Darrel,
While poking around and getting ideas, I got to looking at ver 1.2 of "Elapsed_INT-18.bas". I was particularly interested in the nice routine to calculate the timer reload constant:


'...

See http://darreltaylor.com/DT_INTS-18/home.html. Darrel has done a good job documenting the Instant Interrupts, and it shows on the right side of the page that multiple external interrupts are...

Just to clarify one important item. Here is snippet from the PIC18F8722 Datasheet under Memory Organization:



So, more accurately, RETFIE FAST works when low-priority interrupts are enabled,...