[Coco] Last video I promise... :)

Fri Dec 5 13:33:02 EST 2014

Oh, okay, I'm feeling better now ;)

Shain
On Dec 5, 2014 12:32 PM, "Luis Antoniosi (CoCoDemus)" <
retrocanada76 at gmail.com> wrote:

> No I'm not planing in removing them. I'm just explaining what could be done
> :)
>
>
>
> Luis Felipe Antoniosi
>
>
>
> On Fri, Dec 5, 2014 at 12:27 PM, S Klammer <sklammer at gmail.com> wrote:
>
> > Luis, I'm sorry to hear that you are considering/intending to remove the
> > artifact ability.
> >
> > I've not received my "surplus" funds to purchase the needed pieces yet to
> > build one myself; but, would a shielded cable to bypass the possible
> noisy
> > traces help?
> >
> > Shsin
> > On Dec 5, 2014 11:09 AM, "Luis Antoniosi (CoCoDemus)" <
> > retrocanada76 at gmail.com> wrote:
> >
> > > Ok finally my mules decided to arrive and I assembled one for me.
> > >
> > > I don't get the noise you have there, but I noticed there is a small
> > noise.
> > > My prototype doesn't have this. The culprit is the VGA ouput. In my
> > > prototype I have placed them far away from the input lines. But in the
> > new
> > > design i tried to make things more compact and I sucked on this :P
> > >
> > > Well, modifying the FPGA I have reduced the amout of noise changing the
> > > input/output currents. You can check whether your noise is the vga by
> > > doing:
> > >
> > > screen 80
> > > cls 4
> > > dir
> > >
> > > Check if the noise increases as the amount of the text on screen also
> > > increases. In your video, when you blast the trimmers, I can clearly
> see
> > > blanking lines waving, so it must be it.
> > >
> > > How to solve this completely ? Redesign the board ? Using a faraday
> cage
> > ?
> > >
> > > Update your repo and try the new version. it might help.
> > >
> > > Regarding the colors, you may notice that some colors have a "noise
> > > pattern" on that, look that this partern doesn't run, it has some
> > > flickering but they stay put.
> > >
> > > This is not external interference, it's merely slack time that is
> > affecting
> > > how the colors are digitized. Let's say: the altera is running the code
> > at
> > > the limit of it's speed. This cause the code to get out of sync with
> the
> > > clock and then, the color is digitized in the wrong level of the DAC,
> or
> > it
> > > didn't have time enough for the differential to change its value.
> Solving
> > > this is much more difficult.
> > >
> > > The first thing is to remove and simplify the code, this means no more
> > > artifacting colors, and other stuff. This would help getting a stable
> > > timing though.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Luis Felipe Antoniosi
> > >
> > >
> > >
> > > On Fri, Nov 28, 2014 at 11:11 PM, Richard Goedeken <
> > > Richard at fascinationsoftware.com> wrote:
> > >
> > > > Hi Luis,
> > > >
> > > > Here are new images of the board and the video output:
> > > >
> > > > http://www.fascinationsoftware.com/media/rgb2vga/IMG_9763.JPG
> > > > http://www.fascinationsoftware.com/media/rgb2vga/IMG_9766.JPG
> > > > http://www.fascinationsoftware.com/media/rgb2vga/IMG_9768.JPG
> > > > http://www.fascinationsoftware.com/media/rgb2vga/IMG_9770.JPG
> > > > http://www.fascinationsoftware.com/media/rgb2vga/IMG_9775.JPG
> > > >
> > > > Unfortunately, grounding the connector shield didn't fix the noise
> > issue;
> > > > it's
> > > > still there like before.  I'll have to consider all of the various
> > > devices
> > > > that are plugged in, and see if there is a ground loop there
> somewhere.
> > > I
> > > > am
> > > > using 1% resistors for the 75 ohms.  Do you have any suggestions for
> > > > improving
> > > > the color fidelity?  What changes did you make to the FPGA code to
> > > > customize
> > > > it for your particular Coco?
> > > >
> > > > Richard
> > > >
> > > > On 11/28/2014 05:55 PM, Luis Antoniosi (CoCoDemus) wrote:
> > > > > now I saw the video.
> > > > >
> > > > > First question: which program is that ? How do I get it. It's very
> > nice
> > > > for
> > > > > testing the colors.
> > > > >
> > > > > Second, can you take a picture of your board ? bottom/top ?
> > > > >
> > > > > There is indeed a noise band rolling. I don't get these, but my
> board
> > > > from
> > > > > osh park DIDN"T ARRIVE YET. I takes a month to cross the canadian
> > > border.
> > > > > Dude they must put them on the back of mules. Cannot explain that.
> > > > >
> > > > > Then check the grounding. Make sure everything is grounded from
> coco,
> > > > > altera and the monitor. (make sure the outer shell is grounded as I
> > > > said).
> > > > > It's getting there, the image is pretty good already.
> > > > >
> > > > > Also, do you have MPI or any other device  on your coco ? I'm
> always
> > > > > testing with either superIDE or CocoSDC but never mpi. Just try the
> > > coco
> > > > > without any device and check the 32 and 80 columns screens:
> > > > >
> > > > > width 80
> > > > > 10 for n=32 to 255
> > > > > 20 print chr$(n);
> > > > > 40 next n
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Luis Felipe Antoniosi
> > > > >
> > > > >
> > > > >
> > > > > On Fri, Nov 28, 2014 at 8:02 PM, Richard Goedeken <
> > > > > Richard at fascinationsoftware.com> wrote:
> > > > >
> > > > >> Hi Luis,
> > > > >>
> > > > >> Thank you so much for designing the awesome video converter and
> > making
> > > > all
> > > > >> the
> > > > >> plans available.  I built one up yesterday and hooked it up to my
> > Coco
> > > > 3,
> > > > >> and
> > > > >> it works, but there is some noise in the video output and the
> colors
> > > are
> > > > >> not
> > > > >> exactly right.  Can you help me get it working?
> > > > >>
> > > > >> I uploaded a video which shows the problems very well.  It's raw
> > > mpeg2ts
> > > > >> (AVCHD) at 1080i 60hz from my video camera; the file is about
> 131MB.
> > > I
> > > > >> didn't
> > > > >> want to upload it to youtube which would crush the resolution and
> > > frame
> > > > >> rate.
> > > > >>  You should be able to view it with VLC or mplayer or similar:
> > > > >>
> > > > >> http://www.fascinationsoftware.com/media/Coco3-RGBVGA.mts
> > > > >>
> > > > >> In the video, I turn the 10k potentiometer up and down to show how
> > it
> > > > >> affects
> > > > >> the colors.  You can see that there are some rolling bands of
> noise
> > in
> > > > the
> > > > >> brightness values of the pixels.  And many of the colors seem to
> be
> > > the
> > > > >> same
> > > > >> shade.
> > > > >>
> > > > >> The test screen output (when the Coco is turned off) is perfect,
> so
> > > the
> > > > >> problem is with the input section.  I wasn't sure exactly which
> > build
> > > of
> > > > >> your
> > > > >> FPGA code I should use.  And I've never used FPGA tools before, so
> > > there
> > > > >> was a
> > > > >> little bit of a learning curve in installing the tools and using
> > them.
> > > > >> But I
> > > > >> ended up with the latest git clone from the github repo (as of
> > > > yesterday),
> > > > >> and
> > > > >> I used the Quartus programmer tool to write the output_file.jic
> into
> > > the
> > > > >> serial eeprom loader memory.  Should I have used a different
> > version?
> > > > Do I
> > > > >> need to compile the fpga code?  It looks from your repo that you
> > > update
> > > > the
> > > > >> SOF and JIC files with every commit, so I assume that means I
> don't
> > > > need to
> > > > >> compile the project if I don't make any of my own changes.
> > > > >>
> > > > >> Any ways, thanks again for this great product, and I hope I can
> get
> > it
> > > > >> working
> > > > >> here.
> > > > >>
> > > > >> Richard
> > > > >>
> > > > >> On 11/11/2014 05:03 PM, Luis Antoniosi (CoCoDemus) wrote:
> > > > >>> It's all here:
> > > > >>>
> > > > >>> https://sites.google.com/site/tandycocoloco/rgb2vga
> > > > >>>
> > > > >>>
> > > > >>> Luis Felipe Antoniosi
> > > > >>>
> > > > >>>
> > > > >>>
> > > > >>> On Tue, Nov 11, 2014 at 7:23 PM, Mark McDougall <
> > > msmcdoug at iinet.net.au
> > > > >
> > > > >>> wrote:
> > > > >>>
> > > > >>>> On 12/11/2014 2:42 AM, Luis Antoniosi (CoCoDemus) wrote:
> > > > >>>>
> > > > >>>>  Let's say: everytime you add a switch and a if condition the
> code
> > > > >> splits
> > > > >>>>> in
> > > > >>>>> two and the fpga seems to execute both. It's all parallel. It's
> > > hard
> > > > to
> > > > >>>>> understand...
> > > > >>>>>
> > > > >>>>
> > > > >>>> Is the code public? I can attempt to explain it if you're
> > > interested?
> > > > >>>>
> > > > >>>> Regards,
> > > > >>>>
> > > > >>>> --
> > > > >>>> |              Mark McDougall                | "Electrical
> > Engineers
> > > > do
> > > > >> it
> > > > >>>> |  <http://members.iinet.net.au/~msmcdoug>   |   with less
> > > > resistance!"
> > > > >>>>
> > > > >>>> --
> > > > >>>> Coco mailing list
> > > > >>>> Coco at maltedmedia.com
> > > > >>>> https://pairlist5.pair.net/mailman/listinfo/coco
> > > > >>>>
> > > > >>>
> > > > >>
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> > > > >>
> > > > >
> > > >
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> > > >
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