Hi Andrew (Andrew Warren), in <199808121817.NAA18650@dfw-ix5.ix.netcom.com> on A
ug 12 you wrote:

>                         ;HI MD LO
>                         ;
>                         ;00 FF 00
>         DECF    HI      ;FF FF 00
>         DECF    MID     ;FF FE 00
>         DECF    LO      ;FF FE FF
>
>         INCFSZ  LO,W    ;FF FE FF    W = 0
>         INCF    MID     ;FF FE FF    -- SKIPPED --
>
>         INCFSZ  MID,W   ;FF FE FF    W = FF
>         INCF    HI      ;00 FE FF
>
>     Of course, I could always be wrong... Do you see an error in the
>     comments I've added?

No, but you've taken the wrong starting point.  The problem case is
0x00FF01:

                         ;HI MD LO
                         ;
                         ;00 FF 01
         DECF    HI      ;FF FF 01
         DECF    MID     ;FF FE 01
         DECF    LO      ;FF FE 00

         INCFSZ  LO,W    ;FF FE 00    W = 1
         INCF    MID     ;FF FF 00    not skipped

         INCFSZ  MID,W   ;FF FF 00    W = 00 <-- propagation problem
         INCF    HI      ;FF FF 00    skipped