$F7-$F8/247-248:   RS232 Input Buffer Pointer

  Used by pucrunch: Bit-Stream, Escape Code

  Used by ByteBoiler: Depacker

Kernal-Reference:

 LDA ($F7),Y : $F096
 STA ($F7),Y : $EFB1
 STX $F7     : $F472

 LDA $F8     : $F2B5 $F46B
 STA $F8     : $F2C1
 STY $F8     : $F470

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