[vdr] [PATCH] RGB/PAL over VGA at variable frame rate

Gavin Hamill gdh at acentral.co.uk
Tue Aug 12 14:49:36 CEST 2008


On Tue, 2008-08-12 at 14:52 +0300, Pasi Kärkkäinen wrote:

> These two links seem to have a bit different ways of doing the cable.. 
> The first link has more "complicated" cable.. 
> 
> Can someone try and compare these or explain the differences? 

Only Radeons can output a composite sync signal. That's why the second
link will only work on Radeons.

The simple circuit in the first link merely takes seperate horiz +
vertical syncs and combines them into the composite sync required for TV
display. As such it will work on any VGA card, but since Thomas' work is
restricted to supporting Radeons, there seems little point to make
things more complex by building a circuit rather than just a few wires
and one resistor :)

Note that pin 9 on the Radeon VGA port will provide +5V for you to feed
into SCART pin 16 to tell your TV that it's an RGB signal. i.e. you
don't need to take a feed from your PC PSU.

Cheers,
Gavin.


Cheers,
Gavin,





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