Hi Peter.

2nd look...

Base_4 inc/dec is obvious and not interesting.

;Base_3 inc / File 1.0 used, other bits are preserved
;inc(0)=1 Cy=0, inc(1)=2 Cy=0, inc(2)=0 Cy=1, ...

movlw   1
btfsc   File,1  ; ==2? 2+1=3 -> 0
movlw   -2
addwf   File,F

;Base_3 dec / File 1.0 used, other bits are preserved
;dec(2)=1 Cy=1, dec(1)=0 Cy=1, dec(0)=2 Cy=0, ...

movlw   2
btfss   File,1
btfsc   File,0
movlw   -1
addwf   File,F


WBR Dmitry.


>   movf  File,w
>   andlw 0x03
>   xorlw 0x03
>   movlw 0xFC
>   btfsc STATUS,Z
>   andwf File,f
>
> On the second look it is not that long ... thanks anyway.
>
> Peter

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