ubb-vga "double" mode (was Re: Ben + UBB + a few components = "VGA")

Ron K. Jeffries rjeffries at gmail.com
Sun Apr 24 23:37:51 EDT 2011


Werner
Is all your code in C, or did you use some assembly language?
Or maybe this is all assembler?

Any hope of recovering the missing pixels on the edges?
---
Ron K. Jeffries


On Sun, Apr 24, 2011 at 20:19, Werner Almesberger <werner at almesberger.net>wrote:

> I wrote:
> > Yeah, I wonder how much we can strecth those timings. At least in
> > theory, a digital display doesn't really need a lower bound for
> > pixel frequency and such. So maybe even a better approximation of
> > full QVGA resolution is possible.
>
> ubb-vga now has a "double" mode in which it uses a set/clear pair
> for each pixel instead of alternating set and clear. This improves
> the resolution but makes the timing quite VGA-unlike.
>
> Single:
>
> http://downloads.qi-hardware.com/people/werner/ubb/vga/ubb-vga-screenshot.jpg
>
> Double:
> http://downloads.qi-hardware.com/people/werner/ubb/vga/ubb-vga-double.jpg
>
> For reference, the original screen content is here:
>
> http://downloads.qi-hardware.com/people/werner/ubb/vga/jlime-desktop-original.png
>
> One can see that about five pixels get chopped off the left and
> about 25 pixels off the right. I've tried this only with one
> monitor so far and don't know yet how palatable others will find
> this signal.
>
> For those interested in how the mappings work, here's a diagram:
> http://downloads.qi-hardware.com/people/werner/ubb/vga/mapping.pdf
>
> And here's the description (section "Single/double mode"):
>
> http://projects.qi-hardware.com/index.php/p/ben-blinkenlights/source/tree/master/ubb-vga/README
>
> Last but not least, Wolfgang has made a better conversion of my
> ubb-vga video (uncut):
>
> http://en.qi-hardware.com/w/images/7/76/Ben_UBB_VGA.ogv
>
> Thanks !
>
> - Werner
>
>
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