     $03-$04/3-4:   Jump Vector: Convert FAC to Integer in (A/Y)

       Points to $B1AA

    Kernal-Reference:

     LDA $0003,Y : $B8BD
     LDY $03,X   : $B989
     ROR $03,X   : $B9B2
     SBC $03,X   : $B8C0
     STA $03     : $E3DC
     STY $03,X   : $B98F

     LDA $0004,Y : $B8B6
     LDY $04,X   : $B985
     ROR $04,X   : $B9B4
     SBC $04,X   : $B8B9
     STY $04     : $E3DE
         $04,X   : $B98B