$D1-$D2/209-210:   Pointer: Current Screen Line Address

Kernal-Reference:

 LDA $D1     : $EA24
     ($D1),Y : $E606 $E63C $E763 $E7F4 $E80B $EA47
 STA $D1     : $E9F3
     ($D1),Y : $E766 $E775 $E80E $E81D $E9D6 $EA0C $EA1E

 LDA $D2     : $EA28
 STA $D2     : $E9FC

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