$06-$07/6-7: Track and sector for buffer 0
ROM-Reference:
LDA $06,X : $D519 $D556 $E610
LDA $06,Y : $DE45
STA $06,X : $F101
STA $06,Y : $D6D7
LDA $07,X : $D514 $D55A $E614
LDA $07,Y : $DE4A
STA $07,X : $F105
STA $07,Y : $D6DC
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