[Coco] Roy is back! :)

[Roy Justus]

thanks for the info.   Yes it is likely that there is a filter somwhere in the
circuit to block the noise.


Roy Justus
rjrtty at aol.com


-----Original Message-----
From: Barry Nelson <barry.nelson at amobiledevice.com>
To: coco <coco at maltedmedia.com>
Sent: Sun, Jun 21, 2015 5:08 am
Subject: [Coco] Roy is back! :)


Roy! I am glad to see you are back! While you were sick, necessity was the
mother of invention for me and I developed another solution for displaying the
CoCo 3's RGB video by using a special custom cable to connect the CoCo 3 to an
off the shelf retail SCART to HDMI converter. This solution works well and has a
more modern HDMI output, which I needed anyway, since my new TV lacked a VGA
input. I also don't seem to have any noticeable distortion when viewing 80
column text on a cls(7) background. Could this be because SCART is often used at
15khz 480i and the retail adapter I use may have a filter? Or maybe I don't know
what to look for?
 Anyway, I like designing this stuff, but I hate making mass
production items so maybe you could look over the info and maybe offer this
cable to people who don't want to build it them selves? I have had a few
inquiries from people asking me to build them a cable, and I answered they would
either have to contact some companies who make custom cables or wire it them
selves from the information in my document, but if you like building things
maybe you could provide this as another option. I am sure it would be MUCH
easier to make someone this cable than to build a whole converter too. If you
can't find the information of this list, I can send another copy of my wiring
diagram directly to you. In the mean time, I'll keep on designing prototype
stuff, but someone else will need to build it for "mass" production.

On Jun 20,
2015, at 10:34 PM, coco-request at maltedmedia.com wrote:

> Date: Sat, 20 Jun 2015
16:30:22 -0400
> From: Roy Justus <rjrtty at aol.com>
> To: coco at maltedmedia.com
>
Subject: [Coco] Coco RGB to SVGA
> Message-ID:
<14e12aa37df-79b7-c7f3 at webprd-m32.mail.aol.com>
> Content-Type: text/plain;
charset=utf-8
> 
> Dear coco friends,
> 
> 
>      I have nearly recovered  
from illness and loss of my data files
> so I am getting ready to restart
production of my converter.
> 
>      I also  want to discuss some aspects of
the process of conversion
> of Coco RGB.     First is the noise some see with
early version of my
> converter.   Most common is the vertical bands seen during
use.
> Another is the distortion seen with some foreground/backround
> when
viewing 80 column text.   Typically the blue in a cls(7) backround
> in SECB.  
At first I tried to eliminate this noise  but had little
> success doing
it.


-- 
Coco mailing
list
Coco at maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco