$AA/170:   RS232 Input Byte Buffer/Tape temporary

Kernal-Reference:

 BIT $AA     : $FA72
 DEC $AA     : $FAA9
 LDA $AA     : $EFA4 $EFDB
 ROR $AA     : $EF6B
 STA $AA     : $F852 $FA88 $FAA7 $FAAF $FABC $FB4A

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