rta guessing, but I think that the priority rotation thing is
applied by SNES games to keep sprites on the screen.&nbsp; That is, when
there are too many sprites on the screen at once I believe the SNES will
turn certain sprites off in order to reduce the load on the PPU.&nbsp;
So I think the SNES takes the "a" bits, shifts them right one and the result
is which sprite to re-activate.&nbsp; In the process another sprite gets
turned off.&nbsp; Another possibility is that it doesn't matter what address
you se