juice2839 Posted July 1, 2015 Share Posted July 1, 2015 I have been working on this coco 2 rgb mod for sometime.. I unfortunately got laid off last week, but on the flip side, with the extra time, I have finally got this working perfect. It basically turns the r-y b-y into RGB. Then I run it into a scart to hdmi converter. The picture is of 1080i output. Check it out. 4 Quote Link to comment https://forums.atariage.com/topic/239999-rgb-out-of-a-coco-2-i-finally-have-a-working-prototype-looks-great/ Share on other sites More sharing options...
JamesD Posted July 1, 2015 Share Posted July 1, 2015 That's the cleanest CoCo 1/2 video I've seen.Is this like computer monitor RGB or component TV video? Quote Link to comment https://forums.atariage.com/topic/239999-rgb-out-of-a-coco-2-i-finally-have-a-working-prototype-looks-great/#findComment-3268332 Share on other sites More sharing options...
juice2839 Posted July 1, 2015 Author Share Posted July 1, 2015 That's the cleanest CoCo 1/2 video I've seen. Is this like computer monitor RGB or component TV video? ' It's the cleanest video you can get. Yes computer monitor RGB, although I don't have a RGB monitor to test it on only a scart(RGB) to hdmi converter. Quote Link to comment https://forums.atariage.com/topic/239999-rgb-out-of-a-coco-2-i-finally-have-a-working-prototype-looks-great/#findComment-3268337 Share on other sites More sharing options...
juice2839 Posted July 1, 2015 Author Share Posted July 1, 2015 I don't see any reason why I couldn't also use the r-y b-y and y signals before the RGB converter circuit to run the component inputs on a TV though. Quote Link to comment https://forums.atariage.com/topic/239999-rgb-out-of-a-coco-2-i-finally-have-a-working-prototype-looks-great/#findComment-3268435 Share on other sites More sharing options...
Zippster Posted July 1, 2015 Share Posted July 1, 2015 Schematic? This is still 15.7khz video, so converters (with a scan-doubler in there somewhere) will have to be used to get it on a VGA monitor. Still, this is analogous to the RGB video on a CoCo3. Unfortunately as with the CoCo3, the composite artifacts relied on by most games wouldn't work, but high quality composite and s-video can be derived from RGB, perhaps using one of Analog Devices ICs. - Ed 1 Quote Link to comment https://forums.atariage.com/topic/239999-rgb-out-of-a-coco-2-i-finally-have-a-working-prototype-looks-great/#findComment-3268770 Share on other sites More sharing options...
juice2839 Posted July 1, 2015 Author Share Posted July 1, 2015 Schematic? This is still 15.7khz video, so converters (with a scan-doubler in there somewhere) will have to be used to get it on a VGA monitor. Still, this is analogous to the RGB video on a CoCo3. Unfortunately as with the CoCo3, the composite artifacts relied on by most games wouldn't work, but high quality composite and s-video can be derived from RGB, perhaps using one of Analog Devices ICs. - Ed You could use an AD724 of AD725 to convert the RGB to composite video. I am not sure if you would get the artifact's back using that or not (Not on an LCD for sure). You can use one of the many cheap RGB to VGA converter out there if you wanted to use your Coco on a VGA monitor. I personally wanted this so that I could use my COCO 2 with a new LCD TV and have a perfect picture. I plan to make a few kits and offer some upgrades so I am keeping the schematics out of the public domain for the moment. Quote Link to comment https://forums.atariage.com/topic/239999-rgb-out-of-a-coco-2-i-finally-have-a-working-prototype-looks-great/#findComment-3268811 Share on other sites More sharing options...
Barry Nelson Posted March 10, 2016 Share Posted March 10, 2016 I built a composite output circuit for a CoCo 1. The quality is not as good as RGB, but it does do the artifact colors correctly. https://hackaday.io/project/7613-coco-1-composite-video-output Here are some pictures: 4 Quote Link to comment https://forums.atariage.com/topic/239999-rgb-out-of-a-coco-2-i-finally-have-a-working-prototype-looks-great/#findComment-3464986 Share on other sites More sharing options...
ColorComputerStore Posted April 4, 2019 Share Posted April 4, 2019 juice2839, can you release the schematic? Thanks Quote Link to comment https://forums.atariage.com/topic/239999-rgb-out-of-a-coco-2-i-finally-have-a-working-prototype-looks-great/#findComment-4251359 Share on other sites More sharing options...
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