$B6/182:   RS232 Output Byte Buffer/Tape Read Error Flag

Kernal-Reference:

 LDA $B6     : $FA95 $FAEB $FB2F $FBDC
 LSR $B6     : $EEC1
 ROR $B6     : $FBC9
 STA $B6     : $EF28 $FA5B $FAE9
 STX $B6     : $FC8F
 STY $B6     : $FB2D

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