The question was asked, "How come nobody uses the LCALL
instruction to guarantee a correct page swap on multi-page
PICs"?

The short answer is that not everybody is using the
Parallax assembler, which includes this instruction as a
multi-step macro instruction. I use it, but I understand
that some purists don't. It's not native to the architecture;
Parallax put it in as an 'extra', so fools like me wouldn't
have to worry about it.
Mark G. Forbes   forbesm@peak.org   KC7LZD   http://www.peak.org/~forbesm
"Never ascribe to malice that which can be blamed on the engineer."