$BAD4/47828:   Overflow / Underflow

Jump from $E00B:

BAD4: A5 66     LDA $66       ; FAC Sign
BAD6: 49 FF     EOR #$FF
BAD8: 30 05     BMI $BADF

Jump from $BAB9, $BAC4:

BADA: 68        PLA
BADB: 68        PLA
BADC: 4C F7 B8  JMP $B8F7     ; Perform Addition

Jump from $BAD8, $BAC0, $BAEB, $BAF6, $BB23:

BADF: 4C 7E B9  JMP $B97E     ; Output ?OVERFLOW Error

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