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

Sat Jul 11 01:14:06 EDT 2015

Ok.  I figured out what the issue was with the .jic.  I was using the .jic
that some one one the mailing list created.  I got them mixed up.  When I
used Luis' .jic everything works fine.

On Sat, Jul 11, 2015 at 12:53 AM, John B <trymyz at gmail.com> wrote:

> Thanks Steve.  Yeah something isnt right when I program the .jic vs .sof.
> Don't get me wrong it works, but it just doesnt show the test pattern.  I
> will mess with it some more.
>
> On Sat, Jul 11, 2015 at 12:43 AM, Steve Batson <
> steve at batsonphotography.com> wrote:
>
>> John,
>>
>> I had to copy everything from Luis' code I downloaded to a folder that
>> the software used and then use it to program the board. I don't recall the
>> steps, but it did work the first time I got my convert hard plugged in. And
>> yes, when the CoCo is off, it displays a default test pattern built in to
>> the FPGA software.  When I turn the CoCo on, it goes to the CoCo screen.
>> Something doesn't sound right with what you are seeing though. You may have
>> to play with getting the FPGA programmed, those don't have anything to do
>> with the card.
>>
>>
>>
>>
>>
>> On Jul 10, 2015, at 9:28 PM, John B <trymyz at gmail.com> wrote:
>>
>> > Interesting.  When I used the .jic from Github I would no longer get the
>> > test pattern when the CoCo was off so I just compiled my own.  Now it
>> > behaves just like the .sof..  The .jic from github would just display a
>> > previous CoCo image (somewhat garbled) when the power was off.  Do you
>> > experience the same thing when the CoCo is off and the monitor is on?
>> >
>> > On Sat, Jul 11, 2015 at 12:23 AM, Steve Batson <
>> steve at batsonphotography.com>
>> > wrote:
>> >
>> >> I used the .JIC file. Roger had issues with compiling the code and Luis
>> >> said it wasn't the same version and that the compiled version had some
>> >> fixes.
>> >>
>> >> On Jul 10, 2015, at 7:59 PM, John B <trymyz at gmail.com> wrote:
>> >>
>> >>> Steve,
>> >>>
>> >>> I still have the recommended resistor values from Luis' design.
>> >>> Unfortunately no one locally has the values you recommended so I am
>> >> placing
>> >>> my DigiKey order tonight.  I will just create another board since I
>> have
>> >> 2
>> >>> spares.  Then I can really compare the two.  I have taken care of
>> >>> recommendations 1-3.  I will pull that wire tonight.  Also, did you
>> use
>> >> the
>> >>> .sof and/or .jic from Luis' Github page?
>> >>>
>> >>> On Fri, Jul 10, 2015 at 10:39 PM, Steve Batson <
>> >> steve at batsonphotography.com>
>> >>> wrote:
>> >>>
>> >>>> John,
>> >>>>
>> >>>> Have you changed the resistors yet, or are you using the resistors
>> >>>> recommended for the design? I was seeing jitter, where the entire
>> screen
>> >>>> would jerk and occasional waves going through it mostly noticeable on
>> >> the
>> >>>> edges. Also, it didn't seem consistent, sometimes it was worse than
>> >> others.
>> >>>> Based on what Roger had found, it sounded like there were a number of
>> >>>> issues being caused by the original resistor values. Voltage Levels
>> were
>> >>>> not what they should be. Also there was issues with the HSYNC and
>> VSYNC
>> >>>> again caused by original resistor values. Luis and posted on the FB
>> >> page a
>> >>>> response to one of my questions that some CoCo's are noisier than
>> others
>> >>>> and this may very well be true, but I'd guess symptoms could be
>> worse on
>> >>>> some systems then others which could be the combination of the CoCo
>> and
>> >>>> Monitor. From discussions with Roger about this and how he fixed it,
>> I'm
>> >>>> going to go out on a limb here and suggest that with his suggested
>> >> resistor
>> >>>> values, the video will most likely be crisp, clean and jitter free on
>> >> most
>> >>>> any CoCo and VGA monitor unless they have problems of their own.
>> >>>>
>> >>>> It was a bit of a pain in the butt pulling a bunch of resistors out
>> and
>> >>>> replacing them with Rogers suggested values, but I'd highly recommend
>> >> it if
>> >>>> you haven't done so already. It was totally worth it! If you have
>> >> already
>> >>>> replaced the resistors with the new values and are still having
>> issues,
>> >> I'd
>> >>>> suggest the following:
>> >>>>
>> >>>> 1) Inspect your board and make sure you have no possible shorts.
>> Clean
>> >> it
>> >>>> real good with alcohol or other good electronic board cleaner and
>> >>>> thoroughly dry.
>> >>>> 2) Check all the cables including power going to the board and make
>> sure
>> >>>> all is well
>> >>>> 3) Make sure the ribbon cable isn't right next to a transformer
>> >> including
>> >>>> the CoCo power power supply (thought I am not having issues even if
>> set
>> >> the
>> >>>> board right on top of the CoCo above the transformer). This probably
>> is
>> >> NOT
>> >>>> an issue.
>> >>>> 4) Remove wire I mentioned that was a ground fix.
>> >>>>
>> >>>> Anyway, let me know if you have changed the resistors yet or not. I'm
>> >> very
>> >>>> curious to see where you are at.
>> >>>>
>> >>>>
>> >>>> On Jul 10, 2015, at 7:18 PM, John B <trymyz at gmail.com> wrote:
>> >>>>
>> >>>>> Steve,
>> >>>>>
>> >>>>> I tested the board out.  The display comes out fine, colors display
>> >>>>> properly, etc.  However, the edge of any line looks slightly wavy.
>> >>>> Hardly
>> >>>>> noticeable.  This is more evident with graphics opposed to text.  Of
>> >>>> course
>> >>>>> I played with the trim pot, but that only helped so much.  Is this
>> what
>> >>>> you
>> >>>>> experienced before u swapped the resistors?
>> >>>>>
>> >>>>> On Fri, Jul 10, 2015 at 11:36 AM, Steve Batson <
>> >>>> steve at batsonphotography.com>
>> >>>>> wrote:
>> >>>>>
>> >>>>>>
>> >>>>>>
>> >>>>>>
>> >>>>>> No problem, Roger deserves the credit all this work. I just
>> duplicated
>> >>>>>> what he did and putting info here hoping it's helpful.
>> >>>>>>
>> >>>>>>
>> >>>>>>
>> >>>>>> I had no stock of resistors and trying to find just a few either
>> >> wasn't
>> >>>>>> economical or easy. Needless to say, I've got a pretty good stock
>> now!
>> >>>>>> :D
>> >>>>>>
>> >>>>>>> Thank you very much Steve. I should be able to
>> >>>>>> test it out today. I will
>> >>>>>>
>> >>>>>>> report back either way. I might put my DigiKey order in anyway.
>> You
>> >>>>>> can
>> >>>>>>
>> >>>>>>> never have too many resistors :)
>> >>>>>>
>> >>>>>>>
>> >>>>>>
>> >>>>>>> On Fri, Jul 10, 2015 at 9:07 AM, Steve Batson
>> >>>>>>
>> >>>>>>> <steve at batsonphotography.com>
>> >>>>>>
>> >>>>>>> wrote:
>> >>>>>>
>> >>>>>>>
>> >>>>>>
>> >>>>>>>> John,
>> >>>>>>
>> >>>>>>>>
>> >>>>>>
>> >>>>>>>> No, the resistor from R7 to Pos 8 on the GPIO1 connector is what
>> >>>>>> was
>> >>>>>>
>> >>>>>>>> referred to as Rx, that resistor should be 1.8K. The drawing on
>> >>>>>> Luis'
>> >>>>>>
>> >>>>>>>> site
>> >>>>>>
>> >>>>>>>> shows a jumper wire to fix a ground issue. If that jumper is in
>> >>>>>> place
>> >>>>>>
>> >>>>>>>> after
>> >>>>>>
>> >>>>>>>> all the resistors in place, you will most likely have Jitter.
>> >>>>>> There
>> >>>>>>
>> >>>>>>>> should
>> >>>>>>
>> >>>>>>>> be no Jumper wires installed. The jumper Luis refers to is
>> >>>>>> between R21
>> >>>>>>
>> >>>>>>>> and
>> >>>>>>
>> >>>>>>>> R18. I'd only install that if Jitter is present with all the
>> >>>>>> resistor
>> >>>>>>
>> >>>>>>>> changes. If necessary, try it both ways, but on Roger and my
>> >>>>>> board it
>> >>>>>>
>> >>>>>>>> wasn't necessary. All of these changes were Roger's findings. I
>> >>>>>> only
>> >>>>>>
>> >>>>>>>> duplicated his setup and it's awesome!
>> >>>>>>
>> >>>>>>>>
>> >>>>>>
>> >>>>>>>>
>> >>>>>>
>> >>>>>>>>
>> >>>>>>
>> >>>>>>>> On Jul 9, 2015, at 10:22 PM, John B <trymyz at gmail.com>
>> >>>>>> wrote:
>> >>>>>>
>> >>>>>>>>
>> >>>>>>
>> >>>>>>>>> I will be testing it tomorrow. Thank you for the new
>> >>>>>> values.
>> >>>>>>
>> >>>>>>>> Hopefully
>> >>>>>>
>> >>>>>>>>> everything will work as intended. You refer to the
>> >>>>>> additional wires
>> >>>>>>
>> >>>>>>>> not
>> >>>>>>
>> >>>>>>>>> being needed. Is this the resistor from R7 to Position 8 on
>> >>>>>> GPIO1 and
>> >>>>>>
>> >>>>>>>> the
>> >>>>>>
>> >>>>>>>>> wire between R18 and R21?
>> >>>>>>
>> >>>>>>>>>
>> >>>>>>
>> >>>>>>>>> On Fri, Jul 10, 2015 at 12:56 AM, Steve Batson <
>> >>>>>>
>> >>>>>>>> steve at batsonphotography.com>
>> >>>>>>
>> >>>>>>>>> wrote:
>> >>>>>>
>> >>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> John,
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> Yes, this is Luis' RGB2VGA board used with the DENano
>> >>>>>> FPGA.
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> Since you have just finished it, I'd test it out first
>> >>>>>> to see if you
>> >>>>>>
>> >>>>>>>> see
>> >>>>>>
>> >>>>>>>>>> any jitter or other problems. However Roger did a lot
>> >>>>>> of
>> >>>>>>
>> >>>>>>>> investigation
>> >>>>>>
>> >>>>>>>> and
>> >>>>>>
>> >>>>>>>>>> found these values produce voltages in line with the VGA
>> >>>>>> Standard and
>> >>>>>>
>> >>>>>>>> to
>> >>>>>>
>> >>>>>>>>>> help the board properly sync from the CoCo output. I
>> >>>>>> don't have all
>> >>>>>>
>> >>>>>>>> the
>> >>>>>>
>> >>>>>>>>>> technical details, I just know it worked for Roger and
>> >>>>>> works for me.
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> These are what Roger came up with and I simply
>> >>>>>> duplicated what he
>> >>>>>>
>> >>>>>>>> found.
>> >>>>>>
>> >>>>>>>>>> Also, the Variable resistor, he recommended a 10K Multi
>> >>>>>> Turn for
>> >>>>>>
>> >>>>>>>> finer
>> >>>>>>
>> >>>>>>>>>> control when tuning for the best appearance. Another
>> >>>>>> thing to know is
>> >>>>>>
>> >>>>>>>> that
>> >>>>>>
>> >>>>>>>>>> there are some additional wires recommended but they
>> >>>>>> were not needed
>> >>>>>>
>> >>>>>>>> on
>> >>>>>>
>> >>>>>>>>>> Roger's or my case and jitter did not go away until
>> >>>>>> removed.
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> Top Left
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> 82 Ohms - Grey-Red-Black-Gold-Brown
>> >>>>>>
>> >>>>>>>>>> R22
>> >>>>>>
>> >>>>>>>>>> R23
>> >>>>>>
>> >>>>>>>>>> R25
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> * * * Bottom Left
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> 1.2K Brown-Red-Black-Brown-Brown
>> >>>>>>
>> >>>>>>>>>> R18
>> >>>>>>
>> >>>>>>>>>> R19
>> >>>>>>
>> >>>>>>>>>> R20
>> >>>>>>
>> >>>>>>>>>> R21
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> * * * Top Right 10
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> R9 47
>> >>>>>>
>> >>>>>>>>>> R10 47
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> 390 ohms
>> >>>>>>
>> >>>>>>>>>> R1
>> >>>>>>
>> >>>>>>>>>> R4
>> >>>>>>
>> >>>>>>>>>> R7
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> 820 ohms
>> >>>>>>
>> >>>>>>>>>> R2
>> >>>>>>
>> >>>>>>>>>> R5
>> >>>>>>
>> >>>>>>>>>> R8
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> 1.8K ohms
>> >>>>>>
>> >>>>>>>>>> R3
>> >>>>>>
>> >>>>>>>>>> R6
>> >>>>>>
>> >>>>>>>>>> Rx (this is the resistor soldered to R7 and the GPIO1
>> >>>>>> Connector)
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> * * * Bottom Right
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> 2K Red-Black-Red-Gold
>> >>>>>>
>> >>>>>>>>>> R17
>> >>>>>>
>> >>>>>>>>>> R14
>> >>>>>>
>> >>>>>>>>>> R12
>> >>>>>>
>> >>>>>>>>>> R11
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> 1K Brown-Black-black-Brown-Brown
>> >>>>>>
>> >>>>>>>>>> R15
>> >>>>>>
>> >>>>>>>>>> R16
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> On Jul 9, 2015, at 9:31 PM, John B
>> >>>>>> <trymyz at gmail.com> wrote:
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>>> Steve,
>> >>>>>>
>> >>>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>>> Are you referring to Luis' RGB2VGA board? The reason
>> >>>>>> I ask is I
>> >>>>>>
>> >>>>>>>>>> literally
>> >>>>>>
>> >>>>>>>>>>> (15 min ago) just finished assmebling my board. I
>> >>>>>> used the
>> >>>>>>
>> >>>>>>>> resistors
>> >>>>>>
>> >>>>>>>> he
>> >>>>>>
>> >>>>>>>>>>> outlined on his page under the
>> >>>>>> "Modifications" section.
>> >>>>>>
>> >>>>>>>>>>> https://sites.google.com/site/tandycocoloco/rgb2vga
>> >>>>>> Are those the
>> >>>>>>
>> >>>>>>>>>>> resistors that produced the video jitter? If so, can
>> >>>>>> you give us
>> >>>>>>
>> >>>>>>>> the
>> >>>>>>
>> >>>>>>>> new
>> >>>>>>
>> >>>>>>>>>>> values that fixed the issue?
>> >>>>>>
>> >>>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>>> Thanks,
>> >>>>>>
>> >>>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>>> John
>> >>>>>>
>> >>>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>>> On Thu, Jul 9, 2015 at 11:45 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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>> >>>>>>
>> >>>>>>>>>>> https://pairlist5.pair.net/mailman/listinfo/coco
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>> --
>> >>>>>>
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>> >>>>>>
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>> >>>>>>
>> >>>>>>>>>> https://pairlist5.pair.net/mailman/listinfo/coco
>> >>>>>>
>> >>>>>>>>>>
>> >>>>>>
>> >>>>>>>>>
>> >>>>>>
>> >>>>>>>>> --
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>> >>>>>>
>> >>>>>>>>> https://pairlist5.pair.net/mailman/listinfo/coco
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>> >>>>>>>>
>> >>>>>>
>> >>>>>>>>
>> >>>>>>
>> >>>>>>>> --
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>> >>>>>>>> Coco mailing list
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>> >>>>>>>
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>> >>>>>>> Coco mailing list
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>> >>>>>>
>> >>>>>>>
>> >>>>>>
>> >>>>>>
>> >>>>>>
>> >>>>>>
>> >>>>>>
>> >>>>>> --
>> >>>>>>
>> >>>>>> Steve Batson
>> >>>>>>
>> >>>>>> Website: http://www.batsonphotography.com
>> >>>>>>
>> >>>>>> Facebook:
>> >>>>>> https://www.facebook.com/pages/Batson-Photography/313748145356
>> >>>>>>
>> >>>>>> Gallery: http://gallery.batsonphotography.com
>> >>>>>>
>> >>>>>> --
>> >>>>>> Coco mailing list
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>> >>>>>>
>> >>>>>
>> >>>>> --
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>> >>>>> https://pairlist5.pair.net/mailman/listinfo/coco
>> >>>>
>> >>>>
>> >>>>
>> >>>> --
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>> >>>>
>> >>>
>> >>> --
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>> >>
>> >>
>> >>
>> >> --
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>> >>
>> >
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>>
>>
>>
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>
>