     fpaki     headr
     *    Convert the 5-digit number in )01&4 to a 3-character       )0C
     *    address in )01&4 using )02, which must be an index         )0C
     *    register.                                                  )0C
     *    Requires a word mark at )02-2.  Clobbers )02&1             )0C
     *                                                               )0C
               incldzonea
     )00       za   )01+2,)02&1
               mz   zonel&)02,)01&4    Thousands / 4
               mz   zoneh&)02,)01&2    Thousands mod 4
