Re: Adapter to use IIGS's RGB output on modern VGA/SVGA monitors (idea?)

[mjmahon@aol.com (Michael J. Mahon)]

ToasterKing wrote:

<snip>
>So far, this is the only thing I've found that's sparked my mind as
>having a chance to do the job:
>
>AV converter 4 in 1 box Ypbpr in RGB Monitor
>http://www.bryce-max.com.hk/AV%20converter%204%20in%201%20box.htm
>
>Would something like this work?  According to the description of this
>product on the page, I gather that it can input component video
>matching the NTSC standard in YPbPr format.  The best definition of
>YPbPr I've been able to find is:
>
>---begin
>YPbPr 
>A component analog video signal containing one luma and two chroma
>components. Often referred to loosely as YUV or Y, B-Y, R-Y. 
>
>YUV 
>In the general sense, any form of color-difference video signal
>containing one luma and two chroma components. Technically, YUV is
>applicable only to the process of encoding component video into
>composite video. See YCbCr and YPbPr. 
>---end
>
>I'd like a better definition of YPbPr to know if it would work.  I am
>hoping that I could possibly construct a cable that connects to the GS
>RGB port via the Dsub-15 connector, and feeds the necessary signals
>individually into the coaxial RCA jacks on the converter box.  Would
>this work with no additional signal manipulation required?

Some signal processing is required, but perhaps only simple
analog addition and subtraction.

There are quad video op-amps available that will certainly
do the job of generating YPbPr from RGB, but you'll have
to get some power to them, since they drive 75 ohm loads.

The Y signal is a weighted sum of R, G, and B signals,
where the weights are a standard.  Pb is B minus Y and
Pr is R minus Y.  All signals have standard polarities and
peak-to-peak amplitudes.

-michael

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