[Coco] GBS-8200 RGB to VGA

[Barry Nelson]

I have had problems feeding that sync signal to anything except a CM8, even after fixing the polarity and boosting the signal. For some reason the sync on the NTSC video works better. Anyway, try the 7402 and let me know if it works for this.

On Sep 3, 2015, at 1:18 AM, coco-request at maltedmedia.com wrote:

> Date: Wed, 2 Sep 2015 21:53:54 -0500
> From: George Ramsower <georgera at gvtc.com>
> To: coco at maltedmedia.com
> Subject: Re: [Coco] GBS-8200 RGB to VGA
> Message-ID: <55E7B642.2070102 at gvtc.com>
> Content-Type: text/plain; charset=windows-1252; format=flowed
> 
>  I could have used that many years ago when I was attempting to build a 
> line 21 decoder. I'll even bet it was available then but, I didn't know 
> about it.
>  For the GBS8200, it isn't necessary. The sync is already available 
> from the RGB port on the Coco but, it's the wrong polarity. A simple 
> 7402 is all that is needed.
> George R.