VGA to SCART connection

hello everyone

yers ago i've read this tutorial (sorry it's in italian but schemes and pinouts are still understandable- this an approsimative translation using google) for building a vga to scart cable. It was written in order to make possibile to connect a pc to an old cathodic tv, for emulating videogame cabinets.
It is written that al it is needed is a video card wich supports 15khz signal to send to the TV.
Some older cards had this as standard option, while newest have to be forced with a specific software (Soft15khz) I've searched internet to see if GMA is capable of a 15khz output and found it's possibile so i've tried to build the cable. On that guide there are so many cable schemes to try each id different and works only in some situations..i've tried the easiest to build (n.5.4) but it didn't worked with my aoa150, anyway it didn't worked even with my desktop
I think the best way is to build cable n5.9 n5.10 or 5.11...anyway i didn't had time to try and left the project..

Has any of you already tried or is interested in this kind of mod?

ps : i know there are adaptors but they are expansive and too big to carry around compared to a cable..and i'm not even sure they works
pps: i can translate in a better english (compared to the google one) any part of the tutorial, if needed

 

HERE is another explanation (in English this time)