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D22D: Move the drawing position a column right and up
Used by the routine at DRAW_WALLS.
Sixteen pixels right and 8 lines up the screen: along a building's second face, the way DRAW_WALLS steps. The pair of tiles is moved past by DRAW_WALL_COLUMN itself.
STEP_RIGHT_UP D22D LD DE,$0008 8 lines up; the column across
D230 JR STEP_ACROSS
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