Ok, I'm storing two 4 bit wide variables in one byte (file register) and I
need to test that neither variable is zero. i.e. the byte is not 0X or X0
hex were X is any 4 bit value. The best I can do is 7, any better?

        P = pic16c55
        #include <16c55.inc>   ; processor assembler definitions
        _CONFIG _xt_osc & _wdt_off & _protect_off
 reset start

 org 8
BufTyp  Res     d'1' ; Pin number to set (0-7).

 org 0
start
        CALL noznibs
;       ....
        HALT

noznibs
        MOVF BufTyp,w
        ANDLW 0x0F
        BTFSC status,z
         RET
        SUBWF Buftyp,w
        BTFSC status,z
         RET

---
James Newton (PICList Admin #3)
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