[Coco] Generic VGA adapter

[Zippster]

To combine into a proper composite sync, use an XOR gate so that your Vsync is
“serrated” with the Hsync pulse.  

This is needed to keep the display Hsync synchronized during Vsync.

- Ed


> On Jan 16, 2017, at 4:27 PM, Steven Hirsch <snhirsch at gmail.com> wrote:
> 
> On Thu, 12 Jan 2017, Paulo Garcia wrote:
> 
>> I just stumbled across this VGA adapter today:
>> 
>> www.aliexpress.com/item/NEW-Arcade-Game-RGB-CGA-EGA-YUV-to-VGA-HD-Video-Converter-Board-HD9800-GBS8200-Hot/32747605607.html
>> 
>> Does anyone here got it? Is it suitable for the CoCo3 or even other
>> computers with RGB or component output?
> 
> That's the so-called "Jamma Board".  Despite what the documentation indicates, it will not accept separate H/V sync in 15KHz. mode.  You'll need to combine them to produce composite sync.  There are many ways to do that and it's been discussed ad-infinitum on this list over the past years.  Even if you do setup composite sync don't expect much out of it. Might be ok for gaming, but looks awful for 80-col. text.
> 
> 
> 
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