[Coco] CoCo 3 to RBG...

[Steve Batson]

Steve,

Can you provide details on building your 2 chip circuit to get it working?

I received mine this week, built cables to Map Coco 3 RGB signals to the on board 8 pin connector as they describe. The board powered fine, I can access it's menu and functions, but no Coco output. Just a green screen, but I don't think it's Coco output though. Coco works fine with composite  out to TV.
 
Any help will be appreciated!  :)

Steve Batson
Batson Photography
"Today's Special Moments, Tomorrow's Priceless Treasures"

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On Jul 19, 2011, at 3:03 PM, Steven Hirsch <snhirsch at gmail.com> wrote:

> On Mon, 11 Jul 2011, gene heskett wrote:
> 
>> On Monday, July 11, 2011 08:40:47 PM Steve Batson did opine:
>> 
>>> Gene,
>>> Both of my Monitors only go down to 31K for the Horizontal Sync. I did
>>> some searching for adapters though and came across something
>>> interesting and possibly useful to me and others here.
>>> Check out the following link.
>>> Assuming I built a cable feed the CoCo RGB into this, put it in some
>>> type of project case with a 5V DC adapter on it, it looks like it might
>>> do what I would need to use a CoCo with any of the new Monitors with a
>>> VGA connector. $39 isn't bad either. Probably can add another $30 or so
>>> buying a project case, 5 Volt power adapter and parts to build the
>>> cable to connect to the CoCo.
>>> 
>>> http://www.jammaboards.com/store/cga-ega-yuv-to-vga-converter-pcb-gbs-82
>>> 20/p rod_291.html?gclid=CJmmksC8-qkCFYcaQgodOlAhXw
>>> Think this would do it?
>>> 
>> It certainly looks as if it should.  And, considering its aimed at
>> prolonging the life of arcade games, and is likely sold by the thousands to
>> the arcade machine owners, that is a good price.  Most of those wouldn't
>> need the box or a PSU as that can be sucked from the arcade boards PSU with
>> a couple of wire nuts, but it looks a little big to hide in a coco, and at
>> 10 watts worth of power needed, demands its own PSU since the coco can't
>> spare that much.
> 
> That board will work great, but unless they changed the design since I bought mine, it does not handle separate sync when fed with RGB 15.75 Khz. video.  I had to build a little two-chip sync-combiner circuit to get it functional.  Not a big deal, but one more hassle.
> 
> If you do manage to get it working with H+V sync, please let us know what you did?
> 
> Steve
> 
> 
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