[Coco] Re: S-video Prospects...

[jdaggett at gate.net]

Roger

You are correct that both versions use the same GIME chip. The PAL version uses 
the RGB outputs of the GIME chip along with the composite output of the GIME 
chip. It looks as if the PAL encoder is using the composite synce protion of the 
composite video signal from the GIME chip. 

The RGB signals are mixed via a weighted mixing ciruit internal to the MC1377 to 
generate a lumina signal and a R-Y and B-Y signal. From what I can determine the 
MC1377 does not output the R-Y and B-Y signals. 

james

On 17 Dec 2005 at 16:46, Roger Merchberger wrote:

Date sent:      	Sat, 17 Dec 2005 16:46:28 -0500
To:             	CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
From:           	Roger Merchberger <zmerch at 30below.com>
Subject:        	Re: [Coco] Re: S-video Prospects...
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> What I'm saying is this: Some people (as I understood it) were saying
> that Chroma & Luma were available on the PAL CoCo3, but not on the
> NTSC CoCo3 due to those signals solely being internal to the NTSC
> GIME. Yet, the GIME is the same between both machines. Therefore, I
> think the GIME has nothing to do with it.