TV outputs and standards are quite simple, but apparently some
explanation might be in order. Since we're already off topic, I'll just
try to summarize some facts regarding things mentioned in the thread.

To start, when talking about baseband video outputs, a TV standard (PAL,
NTSC, etc.) defines two things: the video timings and a color encoding.
Normally, a TV out encoder will take care of all of that and output a
suitable baseband signal, but that requires your video card's and its
driver's cooperation.

FTA (for the Americans), SCART is a european standard AV connector with
2-way composite video, audio and one-way RGB and S-Video signalling,
plus a few data wires that can be used to synchronize the channels tuned
in your TV to your VCR.

In the case of a VGA to SCART cable, you need to create a modeline of
[EMAIL PROTECTED], so the HorizSync is about 15kHz, while VGA monitors usually
support only down to around 31kHz. The color encoding is totally
irrelevant with RGB, you just need to coerce your video card and driver
to output the right frequency. I unfortunately have only done this years
ago, in Windows, using PowerStrip.

You will probably also need to pull up one or two pins in the SCART
connector (8/SWTCH to 12v and 16/BLNK to over 3V) to put your TV into
RGB mode; I've had lots of European TVs that are pretty picky about the
voltage. You may also need to experiment with sync polarity, and
depending on your cable, with composite sync (you need it since SCART
has only one sync pin, but the cable may already wire HSYNC and VSYNC
together).

The SCART RGB way can be painful, but the image quality is worth it
(look at the TV's built in teletext and compare it to a composite video
signal).

Someone also mentioned a VGA to S-Video cable with no intelligence.
Those are usually used in laptops with cooperation of the video
hardware. A simple modeline will not make your video card output
S-Video.

-- 
Jussi Peltola

Reply via email to