This is used to display zooming and rotation effects. MX, MY, and MP are ignored in this mode, cut the BGMap from 0,0. GX, GY, GP, X, and Y are all used just like the Normal mode. The true Param_Base is equal to (Param_Base ^^ 0xFFF0) * 2 + 0×20000. Each line of the BGMap has an entry in the param_table. Each entry determines how that line is to be shifted, called, and rotated.

Table 1: Affine Param table entry

H_SKW - Fixed point that defines the horizontal offset to start cutting out the image from the BGMap. This defines both the source X
offset and the horizontal skew. Change it for each line to generate the horizontal skew. True_h_skew = (float)(h_skw/8.0)
V_SCL - Fixed point that defines the vertical offset to start cutting out the image from the BGMap. This defines both the source Y offset
and the vertical scale. Change it for each line to generate the vertical scale. True_v_scale = (float)(v_scl/8.0)
Prlx - Parallax offset for screen X position, true X coordinates are computed by GX-GP-Prlx = True_X for the left screen, and
GX+GP+Prlx = True_X for the right screen.
H_SCL - Fixed point scale factor for horizontal direction true_h_scale = (float)(h_scl/512.0)
V_SCW - Fixed point skew factor for vertical direction true_v_skew = (float)(v_skw/512.0)

The last three entries in the param table, along with the overplain character are unknown.

h_skw = dest_y * y_skew
v_scl = dest_y * y_scale
source_x = h_skw + dest_x * h_scl
source_y = v_scl + dest_x * v_skw