Re: DRAM refresh

From: Gerrit Heitsch <>
Date: Fri, 14 Oct 2016 08:23:14 +0200
Message-ID: <>
On 10/14/2016 05:51 AM, Julian Perry wrote:
> Hello David,
> Friday, October 14, 2016, 1:35:54 PM, you wrote:
> 	On a less technical note Ive seen some conceptual research that
> involved driving the luminance output partially via a logic probe to see
> at what points on a rasterline (or within a frame) lines toggle.  I get
> that effect with my hyper-sensitive VGA up-converter- the c64c shows the
> system clock pretty clearly as vertical bands, and less so the ras and
> cas drive.  Badlines aren't too hard to spot if you look for them too.
> Yes indeed: I've done a bit of experimentation myself.
> I can't claim these images as mine, but these fascinating images show
> what happens when you do. -

Yes, but these are rendered... I have a photo of a screen produced by a 
C64 with a partially broken VIC that imprints AEC onto the Luma signal.

I won't post it here, but if someone wants it drop me a mail.


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Received on 2016-10-14 07:00:05

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