$80/128:   Current Track number

ROM-Reference:

 CMP $80    : $E2D7
 DEC $80    : $F15F
 INC $80    : $CD1E $EF2B $F143
 LDA $80    : $C8A3 $CD20 $CF31 $D0B2 $D1AE $D4A6 $D55F $D6D5 $D6ED $D921
              $D9F8 $DC5C $DD20 $DD4B $DD5D $DE00 $E06E $E2B0 $E3DA $E3E6
              $E48A $E4C5 $E6E8 $EDFD $EF1D $EF2D $EF78 $EFAB $F02C $F074
              $F092 $F13A $F145 $F17A $F202
 STA $80    : $C5B8 $C607 $C84B $C861 $C874 $C89C $CA06 $CE06 $CF43 $CF61
              $CF6A $D0A7 $D179 $D558 $D7CF $D805 $D9C9 $DBC1 $DBEE $DBFC
              $DE11 $DE48 $DE9D $DF34 $E2C6 $E405 $E612 $E7CC $EDA3 $EDC1
              $EDCF $EDF6 $EE3B $EE94 $EF22 $EF35 $F1BE $F1D1
 STX $80    : $D038 $F150 $F167
 STY $80    : $C1A1 $C1CA $DC88 $E6C3

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