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IIRC, the requirement to get valid PAL RGB from VGA is that

a) The video card outputs composite sync (this a sync signal combining H+V syncs).
b) The video card outputs interlaced.

The ATI cards can do both of these natively (or at least with some tweaking using eg. powerstrip).

The circuit presented earlier in this thread shows how one can generate a composite sync from H+V if it is not being done for you.

However, I think interlacing issue is still there for nvidia.
Read this:
http://www.nexusuk.org/projects/vga2scart/

I built my cable using an H+V compositing circuit - and put the H+V compositing on a switch - if I disable the composite checkbox in powerstrip I lose the TV sync, but I can toggle the switch and voila the TV picture comes back... so it can work.

I'd like to get a passive cooled nvida card that supports the full nvidia HW codec but don't want to give up RGB out. Moving to a modern lcd/plasma/projector with DVI is the real solution I guess.

<blockquote data-quote="bigj" data-source="post: 23909" data-attributes="member: 10940">IIRC, the requirement to get valid PAL RGB from VGA is thata) The video card outputs composite sync (this a sync signal combining H+V syncs).b) The video card outputs interlaced.The ATI cards can do both of these natively (or at least with some tweaking using eg. powerstrip).The circuit presented earlier in this thread shows how one can generate a composite sync from H+V if it is not being done for you.However, I think interlacing issue is still there for nvidia.Read this:<a href="http://www.nexusuk.org/projects/vga2scart/" target="_blank">http://www.nexusuk.org/projects/vga2scart/</a>I built my cable using an H+V compositing circuit - and put the H+V compositing on a switch - if I disable the composite checkbox in powerstrip I lose the TV sync, but I can toggle the switch and voila the TV picture comes back... so it can work.I'd like to get a passive cooled nvida card that supports the full nvidia HW codec but don't want to give up RGB out. Moving to a modern lcd/plasma/projector with DVI is the real solution I guess.<a href="http://" target="_blank"></a></blockquote>

[QUOTE="bigj, post: 23909, member: 10940"] IIRC, the requirement to get valid PAL RGB from VGA is that a) The video card outputs composite sync (this a sync signal combining H+V syncs). b) The video card outputs interlaced. The ATI cards can do both of these natively (or at least with some tweaking using eg. powerstrip). The circuit presented earlier in this thread shows how one can generate a composite sync from H+V if it is not being done for you. However, I think interlacing issue is still there for nvidia. Read this: [url]http://www.nexusuk.org/projects/vga2scart/[/url] I built my cable using an H+V compositing circuit - and put the H+V compositing on a switch - if I disable the composite checkbox in powerstrip I lose the TV sync, but I can toggle the switch and voila the TV picture comes back... so it can work. I'd like to get a passive cooled nvida card that supports the full nvidia HW codec but don't want to give up RGB out. Moving to a modern lcd/plasma/projector with DVI is the real solution I guess. [url][/url] [/QUOTE]