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Just guessing here, but the first example might be doing a hardware scroll of sorts by adjusting the bitmap pointers at a certain point across the screen on certain lines. This would normally give you a few pixels of garbage since only one bitplane pointer is being updated at a time by the copper, leaving the other bitplanes unmoved until a couple of pixels later, but this looks like it might be only a single bitplane in use, so no garbage and just a gutter of a few pixels in between.
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