$FEBC/65212:   Exit Interrupt

Jump from $F9D2, $FA0D, $FA5D, $FA8A, $FB8B, $FC09, $FC54:

FEBC: 68        PLA
FEBD: A8        TAY
FEBE: 68        PLA
FEBF: AA        TAX
FEC0: 68        PLA
FEC1: 40        RTI

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Kernal-Reference:

 LDA $FEC0,X : $F434

 LDY $FEC1,X : $F431