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892B: Enemy movement: Upper nybble >= 1
Used by the routine at update_sprite_path.
L892B 892B AND $F0 Isolate upper nybble
892D LD B,A Save it
892E LD A,(IX+$03) Get counter
8931 AND $0F And apply upper nybble
8933 OR B ...
8934 JR update_sprite_path_0 Jump back into update_sprite_path
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