Hi John (John Payson), in <199709170231.VAA28588@Venus.mcs.net> on Sep 16 you
 wrote:

> [2] Use something like this [nb: this uses up an extra stack level]
>
> Intr:
>         btfss   RP0
>          goto   NotSet
>         bcf     RP0
>         call    IntMain
>         bsf     RP0
>         retfie
> NotSet:
>         call    IntMain
>         bsf     RP0
>         retfie
>
> IntMain:
>         movwf   WSave
>         swapf   STATUS,w
>         movwf   SSave
>         ...
>         swapf   WSave,f
>         swapf   SSave,w
>         movwf   STATUS
>         swapf   WSave,w
>         return          ; ** NOT RETFIE!
>
> This is a bit clunky, but it should be workable.

I didn't work with those parts yet, but how about having TWO save
registers, at the same position in each bank?

Int:    movwf   WSave           ; can be in any bank
        swapf   STATUS,w
        [switch to bank0]
        movwf   SSave
        ...
        swapf   SSave,w
        movwf   STATUS          ; back to that bank
        swapf   WSave,f
        swapf   WSave,w
        retfie

The WSave location must be reserved in _all_ banks for this to work.

Just a thought.