> Jinx:
>
> I think the F84 really needs the RP0 bit as it has two memory banks ...

Yes, but you don't need to use it for accessing the tris registers.
These lines are clipped from a program I use quite regularly for
the F84 (it was written a long time ago in a different environment,
and MPLAB still squawks about using trisa)

porta  equ 05h        ;port a address
portb  equ 06h        ;     b
trisa  equ 85h        ;     a direction
trisb  equ 86h        ;     b

start  equ 00h        ;program start vector

    org start         ;define program start vector
    goto entry

entry    movlw  10h
            tris   porta     ;porta ...i oooo
            movlw  00h
            tris   portb     ;portb oooo oooo
            movlw  80h
            option
           ..............

=================

And how the banksel bits must be used in the F628 in a very
similar program

start  equ 0x00       ;program start vector

         org 0x00
         goto entry

entry    clrf   porta
            movlw  0x07    ;comparators off
            movwf  cmcon
            clrf   status       ;bank0 (clear rp0 and rp1)

(snip)

         bsf    status,rp0    ;select bank1
         bcf    status,rp1

         movlw  0x00        ;oooo oooo
         movwf  trisa
         movlw  0x02        ;oooo ooio
         movwf  trisb

         movlw  0x80                ;portb pull-ups off
         movwf  option_reg

         bcf    status,rp0    ;back to bank0
         bcf    status,rp1

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