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   1          256-Color Shift Mode Diagram (Left)
   2          -----------------------------------
   3
   4             Plane 0    Plane 1    Plane 2    Plane 3
   5  Carried   7654 3210  7654 3210  7654 3210  7654 3210
   6 From Prev  0000 1111  0000 1111  0000 1111  0000 1111
   7       |     |    |     |    |     |    |     |    |
   8       |     |    |     |    |     |    |     |    |
   9      XXXX  0000  |     |    |     |    |     |    |
  10     0      0000 1111   |    |     |    |     |    |
  11           1     1111  0000  |     |    |     |    |
  12                2      0000 1111   |    |     |    |
  13                      3     1111  0000  |     |    |
  14                           4      0000 1111   |    |
  15                                 5     1111  0000  |
  16 <----- Direction of Shift            6      0000 1111
  17                                            7      |
  18                                                   v
  19                                                 Carried
  20                                                 To Next