     fpakb     headr
     * Convert the 5-digit number in )01 to a 3-character address    )0D
     * in )02 using )03, which must be an index register.  Should    )0D
     * NOT be used if )01 or )2. sans index, is 0 or 1.              )0D
     * Requires a word mark at )03-2.  Clobbers )03&1.               )0D
     *                                                               )0D
               incldzonea
     )00       mn   )01,)02
               mn
               mn 
               za   )01-2,)03&1
               mz   zonel&)03,)02    Thousands / 4
               mz   zoneh&)03,)02-2  Thousands mod 4
