$A8/168:   RS232 Input Bit count/Tape temporary

Kernal-Reference:

 ADC $A8     : $EF7A
 DEC $A8     : $EF5D $EF6E
 INC $A8     : $FBDA
 LDA $A8     : $FA57 $FBCD
 STA $A8     : $F98F $FA37 $FB9F
 STX $A8     : $FF2B

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