[Coco] Cross Post from the Facebook Page about the RGB2VGA Board

[John B]

I did both.  The ground fix makes the text more unstable.

On Sun, Jul 19, 2015 at 10:00 PM, Zippster <zippster278 at gmail.com> wrote:

> Hi John,
>
> Are you running with or without the ground fix on the hsync input?
>
> - Ed
>
>
> > On Jul 19, 2015, at 8:41 PM, John B <trymyz at gmail.com> wrote:
> >
> > Steve,
> >
> > I built a second board this weekend with the new resistor values.  Your
> > sheet was quite handy.  Thank you again.  The text has definitely
> > stabilized but a few other things are off.  The left edge of the screen
> is
> > kind of wavy and gray lines are wavy.  For example in KQ3, everything
> else
> > is stable, except the gray lines (lines in the stairs and wall).  They
> seem
> > to shimmer.  I have adjusted the potentiometer but going to far either
> way
> > causes other issues with the image.  I know you recommeneded a multi-turn
> > potentiometer.  Which one are you using?  Anyway, I will most likely try
> a
> > higher quality monitor and see if the image improves.  Currently I am
> using
> > a cheap Dell 17 inch that was in the attic.  Maybe I am being too picky
> and
> > this is as good as it gets.
> >
> > John
> >
> > On Sun, Jul 12, 2015 at 4:53 PM, John B <trymyz at gmail.com> wrote:
> >
> >> I am pretty sure it will stabilize with new resistor values.  Compared
> to
> >> composite, it looks pretty darn good now.  OSH Park only sold the
> boards in
> >> lots of 3 so I have 2 spares.  I will definitely complete the other one
> >> with the new values.  Haven't decided if I will build the third one yet.
> >>
> >> On Sun, Jul 12, 2015 at 1:04 AM, Steve Batson via Coco <
> >> coco at maltedmedia.com> wrote:
> >>
> >>> John,
> >>>
> >>> Trust me, unless you have something else wrong with the board, Roger's
> >>> recommended resistor changes will clean things right up. Mine looks
> awesome
> >>> and I simply duplicated his changes. Since I had a few resistor
> changes, I
> >>> may end up buying another board and building one up fresh with the
> right
> >>> resistors the first time. The board will certainly look better and it
> won't
> >>> hurt to have a spare. I'm not going to buy a spare FPGA
> >>> though...hehehehe...that's a bit pricey.
> >>>
> >>> On Jul 11, 2015, at 9:48 PM, John B <trymyz at gmail.com> wrote:
> >>>
> >>>> Definitely great news.  Hopefully the new resistors will take care of
> my
> >>>> jitter/wavy lines and text problem.  I will find out next week.
> >>>>
> >>>> On Sun, Jul 12, 2015 at 12:42 AM, Steve Batson via Coco <
> >>>> coco at maltedmedia.com> wrote:
> >>>>
> >>>>> I changed the last 4 resistors and didn't really notice much
> >>> difference,
> >>>>> but since values were based on Roger's research and testing and that
> >>> his
> >>>>> board is now solid, I figured I'd do the same. I've Tested all of the
> >>>>> features and it's incredible results.
> >>>>>
> >>>>> The output is rock solid. Colors are Rich. Text looks fantastic in
> 32,
> >>> 40
> >>>>> and 80 columns. I've tested Zaxxon, Grabber, Tetra3, Brewmaster,
> Donkey
> >>>>> King. And The biggie, Sockmaster's port of the Original Donkey Kong
> >>> and it
> >>>>> Looks Awesome! Very happy with the results of this thing. It was a
> lot
> >>> of
> >>>>> work, but it was well worth it.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> On Jul 9, 2015, at 8:45 PM, Steve Batson <
> steve at batsonphotography.com>
> >>>>> wrote:
> >>>>>
> >>>>>> I figured I'd post the following here too. Some discussion occurred
> on
> >>>>> the FB page, but a lot of discussion was done between Roger and
> Myself
> >>> in
> >>>>> email as Roger made several discoveries that stabilized some very
> >>> annoying
> >>>>> jitter problems with video.
> >>>>>>
> >>>>>> RGB2VGA Stabilized!
> >>>>>> First thanks to Felipe for a very cool Solution to bring the CoCo3
> >>> video
> >>>>> to Modern VGA Monitors. Originally, I missed a few resistors that I
> >>> somehow
> >>>>> thought were optional and Felipe straightened me out on those.
> >>>>>> Then I was getting Jitter just like Roger was experiencing. I had
> >>>>> several email discussions with Roger as he was doing some research
> and
> >>>>> experimenting based on what he found about the VGA standards and
> found
> >>> that
> >>>>> changing some resistor values stabilized the output from his board. I
> >>> have
> >>>>> pretty much duplicated Roger's resistor values on my board with the
> >>>>> exception of 4 that I'm waiting to come in, but mine is crisp and
> >>> jitter is
> >>>>> gone. I will most likely change those 4 resistors when the parts come
> >>> in
> >>>>> unless it doesn't make sense.
> >>>>>> Anyway, Finally fantastic output on my VGA monitor. Very Cool!!!
> >>>>>> Very Big thanks to Roger!!!
> >>>>>>
> >>>>>> --
> >>>>>> 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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> >>>
> >>
> >>
> >
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