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

[ToasterKing <toasterking@SPLATbigfoot.com>]

In article <20030512180919.24954.00000344@mb-m06.aol.com>, Michael J.
Mahon <mjmahon@aol.com> wrote:

> 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
> 
> Check out amazing quality 8-bit Apple sound on my
> Home page:  http://members.aol.com/MJMahon/

That sounds like possible a little more complex design than I was
hoping for, especially since my circuit design skills are a little
rusty.  Since I don't know exactly what the specifications of YPbPr
call for, and how to manipulate the signal from RGB, I'm not really
sure where to start here.  If you happen to have any of this knowledge,
could you possibly point me in the right direction?  Otherwise, can you
think of any other easily-achievable design that's a little more
elegant than conversion to first YPbPr, then to VGA?

Many thanks!
TK

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