$A9/169:   RS232 Flag: Start Bit check/Tape temporary

Kernal-Reference:

 BIT $00A9   : $AC0C $E167
 DEC $A9     : $F997
 INC $A9     : $F993 $FBEC
 LDA $A9     : $F9EB $FBE3
 LDX $A9     : $EF59
 ORA $A9     : $FA59
 STA $A9     : $EF89 $FBA3

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