[Coco] French CoCo

[gene heskett]

On 12/1/22 14:33, M. David Johnson via Coco wrote:
> On a side note, I was under the impression that the video output on the CoCo 2 is straight RF.
> 
> I recently picked up an RF-to-HDMI converter to experiment with and, of course, the lashup produces no HDMI picture ☹
> 
> Could anybody point me towards what I'm likely to be missing here?
> 
> --
> M. David Johnson
> mdj at bds-soft.com

Probably not you. That convertor probably expects to see a genuine NTSC 
signal from the coco and its so far off in some of the tech details that 
a digital convertor will likely never lock to it. The color subcarrier 
frequency is about right so analog color works, but nothing in its sync 
signal is any better than it takes to make an elderly 1950's analog tv 
work, ugly result but makes pictures. The digital circuitry cannot cope 
with the errors.

I was a tv chief engineer much of the NTSC days, retired in 2002, NTSC 
was last seen in the US up till midnight, June 30th, 2008.
> 
> -----Original Message-----
> From: Coco <coco-bounces at maltedmedia.com> On Behalf Of Allen Huffman via Coco
> Sent: Thursday, December 1, 2022 10:33 AM
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Cc: Allen Huffman <alsplace at pobox.com>
> Subject: Re: [Coco] French CoCo
> 
> SCART interface for video built in? Interesting. "the only differences with other versions are the Scart video connector and the Azerty keyboard. This "feature" can cause some compatibility problems with some games..."
> 
> I guess I missed that. So we had the traditional RF CoCo, some that had composite video (educational model) and a SCART model… any others?
> 

Cheers, Gene Heskett.
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