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The problem with the code is that it doesn't foresee any drops from full 50fps frame rate.
On accelerators where access to chip ram is slow, you start losing the race with the beam, you don't update the copper list in time, you start to desynchronize more and more and video start glitching like crazy (IRQ3 code is retriggered immediately and forever.., not at the right start of video position).
Even on bare A500 some rendering require a bit more than a frame but on average, with the followings, it returns to a stable 50 fps.
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