     $D9-$F2/217-242:   Screen Line link Table/Editor temporaries
                        High Byte of Line Screen Memory Location

      Used by ByteBoiler: Depacker ($F0-$F2)

    Kernal-Reference:

     ASL $D9,X   : $E6DA
     LDA $D9     : $E92F
         $D9,X   : $E6DF $E6ED $E888 $E918 $E968 $E9F5
     LDY $D9,X   : $E570 $E582 $E9B4
     LSR $D9,X   : $E6DC
     STA $D9,X   : $E55C $E6E3 $E922
     STY $D9,X   : $E54D

     LDA $DA,X   : $E90C $E9B0
     LDY $DA,X   : $E91C
     STA $DA,X   : $E9BA

     LDA $F1     : $E929
     STA $F1     : $E92D