[Coco] rgb2vga rolling video

[Ed Snider]

Also check connections on the output side for vsync if all looks good on input
to the FPGA board header.

- Ed 

> On Jan 6, 2020, at 10:18 AM, Ed Snider <zippster278 at gmail.com> wrote:
> 
> Sounds like your vertical sync isn't getting through.  Check your CoCo's vsync output,
> ribbon cable, connections, etc to ensure vsync is getting to the RGB2VGA board
> and dev board header.
> 
> - Ed
> 
>> On Jan 6, 2020, at 10:04 AM, Matthew Stock <stock at bexkat.com> wrote:
>> 
>> [ trying again with the proper email address ]
>> 
>> Hello all,
>> 
>> The holidays have given me a little time to tinker with the CoCo, and I
>> recently took the opportunity to order the RGB2VGA board that's up on OSH
>> Park.  Soldered it up today and it looks great... except that the display
>> is rolling vertically.  I've tried a couple of different monitors with the
>> same result.  The test block screen looks solid and good, and so I suspect
>> it's an issue with the CoCo 3 I have it attached to.  Anyone have any
>> suggestions on how to fix it?  I was going to start diving into the VHDL
>> and doing some debugging, but since I'm more of a Verilog person I figured
>> I'd ask here and see if this issue has been seen and resolved before.  I
>> looked in my email history and nothing jumped out.
>> 
>> Thanks for any assistance!
>> 
>> Matt
>> 
>