> Guys, before you go till the first blood, take a look at 
> that datasheet
> again. It could be confusing as in Table 4-1 and 4-2 does 
> not even mention
> anything about paging with the FSR. In fact, with the 
> 12F510 they even


All this seems to me like an excellent indication that there 
is a place for a simple and definitive guide written at a 
level that a typical beginner and/or amateur user could 
understand.

Long long long ago I read a book that taught me 
proportionately more about microprocessors compared to what 
I already knew than any other book or course has even done. 
I started knowing nothing and ended it knowing much of what 
I needed to know to become competent in the subject. The 
absolute level of knowledge is not the issue. That book was 
immensely hard for me to absorb. I went over it time and 
again and remember how immensely hard it was to get a good 
overall picture. I have not read the book for decades now. 
But I am certain that if I were to do so there would be 
nothing hard or puzzling in it. It would probably appear 
trivial and simplistic. The book? - "Osborne 1 - an 
introduction to microprocessors". The author in fact did a 
superb job of explaining all the key concepts well enough 
that they could be understood if you worked at it. But I was 
not the only one who found it hard. He went on to write 
"Osborne 2 - some real devices". That was extremely useful 
and by then I could follow it with ease. He THEN went on to 
write "Osborne 0 - <title escapes me>". Osborne 0 was the uP 
101/ uP for dummies etc book. If I had had it first (it was 
then years away) it would have greatly eased my rites of 
passage. So probably best that I didn't. Nowadays Osborne 0 
would probably seem almost banal. But it's probably about 
right for beginners. It's very very very hard for an expert 
to realise how very very hard some "utterly trivial" matters 
can seem.

SO I suspect that there is a place for an "Osborne 0 - 
Fundamental PIC data access & addressing issues".

Any takers?

Odds are the available references are the Osborne 1 of the 
subject. So trivial to eg Olin* that it may be hard to not 
feel that people are not trying very hard if they have 
trouble following them. So obtuse to a beginner that they 
can't see why eg Olin may find it hard not to be impatient 
with them. Both highly understandable if you ever learned 
your basic uP principles from "Osborne 1" :-)


        Russell

* I cite Olin as the example high-expert here, as he is one. 
While his approach to responding on this thread isn't quite 
the way I would have handled it, I have been impressed at 
his reserve and cool calm competence. Hopefully an Osborne 0 
of PICs will eventuate somewhere (he may have to write it 
:-) ) to make the role easier in future.


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