$A6/166:   Pointer: Tape I/O buffer

  Used by Jiffy-DOS: TFLAG

   Used only from Basic for Jiffy-DOS wedge comands, device
   toggle and function keys.

Kernal-Reference:

 DEC $A6     : $F18D
 INC $A6     : $F810
 LDY $A6     : $F812
 STA $A6     : $F1A5 $F3D1
 STY $A6     : $F1F6

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