$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

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