256-Color Shift Mode Diagram (Right)
         -----------------------------------

    Plane 3    Plane 2    Plane 1    Plane 0
   7654 3210  7654 3210  7654 3210  7654 3210   Carried
   0000 1111  0000 1111  0000 1111  0000 1111  From Prev
    |    |     |    |     |    |     |    |     |
    |    |     |    |     |    |     |   1111  XXXX
    |    |     |    |     |    |    0000 1111      0
    |    |     |    |     |   1111  0000     1
    |    |     |    |    0000 1111      2
    |    |     |   1111  0000     3
    |    |    0000 1111      4 
    |   1111  0000     5
   0000 1111      6
    |       7
 Carried 
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