[Elecraft] DVI connectors with an P3SVGA

['Matthew D. Fuller']

On Fri, Mar 23, 2012 at 11:27:58AM -0500 I heard the voice of
Bill K9YEQ, and lo! it spake thus:
>
> I have found I am able to feed analog signal from a DVI PC output
> into an analog/DVI monitor using and adapter out of the DVI output.

Right, but that's orthogonal.  Many cards with DVI can provide analog
out through the port, yes.  My point though is that I'm not aware of
any that don't provide digital (and I can't imagine what the point of
such a thing would be).


Or, more verbosely: The point of the DVI connector is to give a
digital output (hence the Divital Visual Interface ;).  For hysterical
raisins, there are pins on the connector that can also carry a
VGA-style analog signal.  So a DVI port can theoretically give you
analog, or digital, or both.  Or neither, I guess, but then it's just
for show  ;)

But there'd be no point in having a card's DVI port only speak analog,
and not digital; you might as well just put a DE-15 and be done with
it, as it gives you exactly the same capabilities (and the DE-15 will
be higher quality than the analog pins over DVI).  So it's a pretty
safe assumption that any video card with a DVI port is capable of
talking digital out of it; it may also talk analog (I know some do; I
don't know whether it's common or rare lately), but it's staggeringly
unlikely for a card to do (analog && !digital).

Re Joe's mail that I originally replied to:

  > I could add a video card with DVI output to my PC. However,
  > searching the internet it appears there are inexpensive cards with
  > DVI but they are for DVI-A.  The cards with DVI-D output are more
  > expensive.

I'm not sure what card he's finding that has a DVI-A (only analog)
connector on it.  I suspect he's just misreading or something's
mislabelled, as there's no real point to that as a port on a card
(you'd generally only find it as a cable, or possibly a monitor-side
port).  Every DVI card I've ever seen has a DVI-I port (physical pins
for both A/D; whether it actually has analog signal on them I don't
know).



-- 
Matthew Fuller     (MF4839)   |  fullermd at over-yonder.net
Systems/Network Administrator |  http://www.over-yonder.net/~fullermd/
           On the Internet, nobody can hear you scream.