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BF45: Redraw the carried objects if they changed
Used by the routine at draw_and_copy_rects.
Called every frame; does the work only when $5BB4 has been set by a pick-up or a drop, and clears it.
display_objects_carried BF45 LD A,($5BB4)
BF48 AND A
BF49 RET Z
BF4A XOR A
BF4B LD ($5BB4),A
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