Routines
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B5AF: Move under gravity and flag for redrawing
Used by the routines at shuttle_block_move and upd_62.
Takes one off the object's dZ, moves it by dX, dY and dZ as far as the collision code allows, and marks it to be wiped and drawn. Also used by the sliding blocks and the movable block.
Input
IX the object
dec_dZ_wipe_and_draw B5AF CALL dec_dZ_and_update_XYZ gravity, collisions and the move
B5B2 JP set_wipe_and_draw_flags wipe and redraw
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