Paul Phillips wrote:

> I'm trying to check to see if PORTB (0-7) are low (all). I'm also
> wising to check a value (in W) whether it matches that PORTB value.

1a.                                     1b.
        TSTF    PORTB                           TSTF    PORTB
        SKPZ                                    SKPNZ
        GOTO    NOT_ZERO_PORTB                  GOTO    ZERO_PORTB

; execute code for zero variant         ; execute code for non zero variant
;       ...                             ;       ...
        GOTO    NEXT_PART               GOTO    NEXT_PART

NOT_ZERO_PORTB:                         ZERO_PORTB:
; execute code for non zero variant     ; execute code for zero variant
;       ...                             ;       ...

NEXT_PART:                              NEXT_PART:
;       ...                             ;       ...

2a.                             2b.
        XORWF   PORTB,W                 XORWF   PORTB,W
        ANDLW   0b11110000              ANDLW   0b11001100      ;comparing mask'
s
        SKPNZ                           SKPZ
        GOTO    W_EQUAL_PORTB           GOTO    W_NOT_EQUAL_PORTB
;       ...                     ;       ...


Comparing mask bits mean that only bits marked as "1" are needed for
comparision. Other bits are suppressed.

WBR Dmitry.