[Coco] GBS-8200 RGB to VGA

[Steve Batson]

While I'm using the RGB2VGA solution based on the DE0-Nano...I'd love to see the final design of what you are doing. I have a GBS-8200 card, cables and everything wired and ready to go. I'd like to see it working even if it doesn't get much use :)



On Sep 1, 2015, at 10:41 PM, George Ramsower <georgera at gvtc.com> wrote:

> So before I found out this was a bad choice, I ordered and paid for the cheap Chinese RGB to VGA converter board.
> While waiting for it, I began to learn that the H signal from the Coco is inverted and an inverter chip will be necessary to correct that...bummer.
> Then I read that another fellow was connecting a Coco 3 to an SCART to VGA converter board and he found the same problem with the inverted H&V signals from the Coco. He used the Video out and mixed them for the SCART to use and it worked for him.
> I tried something like this on the GBS8200 but I only put the video out from the Coco on the H line on the converter.
> It works beautifully in 32 and 40 column modes but the 80 mode does jump up and down a bit. Otherwise it is great looking.
> Tomorrow I'm going to play with it some more but, this looks really promising. I've simply connected the video out directly to the H input on that converter. Next I'm going to play with levels and resistors and caps, I might even play with the vertical line also but, I have a pretty good feeling this GBS 8200 is going to work just fine.
> 
> George R.
> 
> 
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