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A819: Plot topmost tiles
This plots the complete topmost row of tiles.
Used by the routines at shunt_map_down and shunt_map_down_left.
plot_topmost_tiles A819 LD DE,$F0F8 Point DE' at the start of tile_buf's first row
A81C EXX
A81D LD HL,$FF58 Point HL at the start of map_buf's first row
A820 LD A,($81BC) Get the map's Y coordinate
A823 LD DE,$F290 Point DE at the start of window_buf's first row
FALL THROUGH into plot_horizontal_tiles_common
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