>Well, I already had the suite before these questions came up
>in my mind. You can understand wanting to understand :-)
>what's going on under the hood.

Yeah, sure, but I am not sure you're hood is heading the right way :))

>The PIClist site has been great. I found a few macros that do
>BANKSELs and eventually it dawned on me that I could use DEFINEs
>and IFDEFs to decide whether to do the bank switches. Defines
>for the current bank and conditionals for the switch.
...

I get the feeling you are confusing two separate operations.

here is the relevant portion out of the beginning of a module from Olin's
environment. Note that the bank for local variables is defined as lbank, and
the bank for other global variables is gbank (set elsewhere in the *.ins
module). Then at the bottom of the quoted piece the information the linker
needs is set up  as .bank#v. This tells the linker where the udata
information is to go. This should always be constant unless you redefine the
lbank. I have added a couple of comments to show exactly where the variable
definitions should get put. To see why Olin declares a global area you will
need to dig inside the development environment.

You then need to look at the linker command file to see how the .bank#v
(where #v gets converted to a number) gets matched to the correct ram bank.

As an aside I always declare my externals in the global area as an indicator
that they are accessed/accessing from/to elsewhere, and it tidies them away
into a place where they are likely to be declared within the module that is
declaring the globals anyway.


;
;   Configuration constants.
;
lbank    equ     1      ; register bank for the local state of this module
;
;   Derived constants.
;
lbankadr equ     bankadr(lbank) ; address within local state register bank
;
;***********************************************************************
;
;   Global state.  All this state is assumed to be in the GBANK register
;   bank by other modules.
;
.bank#v(gbank) udata

; variables to go in global bank defined here

;
;***********************************************************************
;
;   Local state.
;
  if lbank != gbank
.bank#v(lbank) udata
    endif

; variables to go in local bank defined here

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