$A4/164:   Pulse Counter Tape Read or Write/Serial Bus shift Counter

  Used by ByteBoiler: Temporary

Kernal-Reference:

 LDA $A4     : $EE80 $F9A2 $FBF5
 ROR $A4     : $EE65
 STA $A4     : $F9A6 $F9BE $FB9D $FBF9

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