$AC-$AD/172-173:   Pointer: Tape Buffer/Screen scrolling

Kernal-Reference:

 CMP ($AC),Y : $FAE3 $FB28
 INC $AC     : $FCDB
 LDA $AC     : $E8EA $E981 $E9E3 $F61A $FAFC $FB0E $FCD2
     ($AC),Y : $E9D4 $F629 $FB72 $FC41
 STA $AC     : $E90A $E962 $E99D $FB94
     ($AC),Y : $FB41

 INC $AD     : $FC37 $FCDF
 LDA $AD     : $E8ED $E984 $E9E7 $F61F $FAF7 $FB15 $FCD6
 STA $AD     : $E95F $E9CD $FB90

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