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

[Kandur]

May try that too, for now I'm using a super simple circuit,
no active components, only resistors. 
The display is stable, seem to work ok.
http://qdv.pw/coco/?p=317 

Kandur

Friday, December 5, 2014, 4:57:46 PM, you wrote:
> cool. One of the problems I see with the GBS is that people only use  a NOR
> gate to combine and invert h and V. But, you don't get the serrillated
> blanking in this way.

> I think the correct would be using a XNOR gate. Do you agree ?



> Luis Felipe Antoniosi



> On Fri, Dec 5, 2014 at 7:45 PM, Kandur <k at qdv.pw> wrote:

>> Breadboarding again.
>> http://qdv.pw/coco/?p=447

>> Kandur

>> Friday, December 5, 2014, 9:32:13 AM, you 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
>> >> > > >>>>
>> >> > > >>>
>> >> > > >>
>> >> > > >> --
>> >> > > >> Coco mailing list
>> >> > > >> Coco at maltedmedia.com
>> >> > > >> https://pairlist5.pair.net/mailman/listinfo/coco
>> >> > > >>
>> >> > > >
>> >> > >
>> >> > > --
>> >> > > Coco mailing list
>> >> > > Coco at maltedmedia.com
>> >> > > https://pairlist5.pair.net/mailman/listinfo/coco
>> >> > >
>> >> >
>> >> > --
>> >> > Coco mailing list
>> >> > Coco at maltedmedia.com
>> >> > https://pairlist5.pair.net/mailman/listinfo/coco
>> >> >

>> >> --
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