$FCB8/64696:   Set IRQ Vector

Jump from $FC86:

FCB8: 20 93 FC  JSR $FC93
FCBB: F0 97     BEQ $FC54

Jump from $F8A1, $FC65, $FC7E:

FCBD: BD 93 FD  LDA $FD93,X
FCC0: 8D 14 03  STA $0314
FCC3: BD 94 FD  LDA $FD94,X
FCC6: 8D 15 03  STA $0315
FCC9: 60        RTS

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