Don't know of any 4550 tutorials.

The PIC18C Reference Manual has a little more info regarding the instruction set. But not enough more to be of much help.
http://ww1.microchip.com/downloads/e...Doc/39500a.pdf

Really, the datasheet has the best info available.
Once you get used to reading them, it gets easier.

Alain,

I haven't used mpsim for awhile, and there's been a few MPLAB upgrades in the mean time. I was going to try your problem, but now PBP isn't even an option in my MPLAB anymore.

I'll have to reinstall the dll again. Been too long, I forget how.
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