You are possibly starting to see the resolution of the AD converter coming in to play. Typically only 8 or 10 bits (i.e. the VGA resolution actually shows less detail with a 10 bit converter).
I wonder about that. The scope has 8-bit A-to-D, but how linear is that?
On the 480 pixel tall display, that's perhaps 2-pixels per A-to-D bit of resolution, assuming they map the A-to-D range to the height of the screen. Possibly a bad assumption, but the "noise" is more than 2-pixels worth.
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