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This is amazing, I assume the sections lighting on/off are getting electrically activated, but what is this yellow orb slowly moving from left to right near the top?

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My hunch is that that's the pixel that's currently addressed?

It's the position of the electron beam in a CRT monitor -- from the VGA signal the hardware is emitting.

Yep, that's what I meant

Looks like it - if you turn the simulation speed slider way up you can see the image forming as it passes over.

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