PJH wrote:

> What's not obvious - at least to me - is how best to specify the
> general  purpose registers in Bank 1, Bank 2 etc.

  Firstly, use TRIS and OPTION wherever possible.  Use ERRORLEVEL to
disable the obnoxious warning which suggests you shouldn't.  It's some
sort of ego-trip within Microchip, no-one has yet revealed the truth
AFAIK.

>  Obviously, I've got to set bits 5,6 in the FSR but can I do that
> within CBLOCK?

  No.

> Or do I need to call a MACRO every time I access one of these
> registers?

  Yes, the macro needs to keep track of RB0 (and maybe RB1) in a
suitable assembler variable, adjusting RBx as necessary, and any other
alteration of these bits must also be performed by a macro which updates
this variable.  You must be careful about subroutines and code looping;
you may want overrides and a macro to set the assembler variable
"undefined" at the start of subroutines.

> If I do that, how do I stop MPLAB thinking it's found a bank
> assignment problem for each of the higher page registers?

  You XOR the assigned value with the assembler variable representing
the current bank, i.e., $80 for bank 1, so the actual value the register
sees is in bank 0 and it is happy.

> Page structured memories - I just love'em!!!

  Ptui!
--
  Cheers,
        Paul B.