$66/102:   FAC Sign

Kernal-Reference:

 BIT $66     : $BCA2 $BDE1
 EOR $66     : $AE7C $BAA5 $BC69 $BD88
 LDA $66     : $A778 $AE33 $B1BB $B7F7 $B853 $B947 $BAD4 $BBEC $BC2F $BC92
               $BCBC $BCD7 $BFB8 $E28B $E293 $E30E
 LDX $66     : $B05F
 LSR $66     : $BC58
 STA $66     : $AD49 $B056 $B857 $B8FB $B94B $BAD1 $BBB9 $BBFE $BC53 $BDEA
               $BFBC $E0E5 $E2CE
 STY $66     : $A9EB $B885 $BCD9

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