$BD/189:   RS232 Output Parity/Tape Byte temporary

Kernal-Reference:

 EOR $BD     : $EEC9 $FB82
 LDA $BD     : $EEE2 $EEF6 $FA9C $FAE1 $FB24 $FB3F $FBA6 $FBFD
 LSR $BD     : $FC0C
 STA $BD     : $EECB $EF15 $FA55 $FC01 $FC2C $FC3B $FC43 $FC52

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