Whoops!  You are right, I left out the IFZERO test when I typed a code
sample from memory.  Sample correction for one of the IFCARRY pairs:
        IFCARRY
        INCF            B3
        IFZERO
        INCF            B2

For 32 bit, it might just be worth writing a loop with pointers!
  <edtodd@sni.net>    Ed Todd