$BFB4/49076:   Negate FAC#1

BFB4: A5 61     LDA $61
BFB6: F0 06     BEQ $BFBE
BFB8: A5 66     LDA $66
BFBA: 49 FF     EOR #$FF
BFBC: 85 66     STA $66
BFBE: 60        RTS

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