> thanks a lot for this. i will go over this in the next few days. this
> is very helpful.

It *should* work. When I have a little time tomorrow I'll run it
through MPLAB and an F84 just to make sure. If it doesn't work
as expected I'll let you know

         xorlw   b'00000010'     ;toggle b0 (LED flash)

Comment should be b1. I wrote the code first with the LED on b0
but then thought you might want to add a capture, and that would
best on b0

As for the timer, you could make it exactly 1s if that's important. If
you remember, 1,000,000 / 256 = 3906.25

By setting TMR0, initially and at the reload, to that extra 0.25 *
256 ( = - d64) and adding 1 to the IRQs to be counted, -> d3907

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