Re: SUN MONITOR MANUAL WANTED!!
On Wed, 21 Jul 1999 16:37:49 +0200, Marco Fioretti wrote:
> 2) Said this, allow me to show off my ignorance of the
> matter by asking what is the difference, if any, between
> sync_on_green and composyte sync features.
A monitor needs two sync signals: horizontal sync (hsync), and vertical
sync (vsync). When you combine hsync and vsync into one signal (can be
done with two 100 ohm resistors), you'll get a combined sync (csync)
signal. If you mix csync with the green signal, you'll get sync-on-green.
> I know that the X server for MATROX card will accept a
> sync_on_green option in the MONITOR section of XFREE86config,
> and I have seen "composite" is a valid flag at the end
> of a modeline, but are composite and sync_on_green
> mutually exclusive?
Yes they are, AFAIK. Also note that my S3 Trio64V+ accepts a sync_on_green
option, but it doesn't _make_ a sync-on-green signal. YMMV.
> Worst yet, since the SUN adapter may rewire signals internally,
> should'nt I just ignore the above options, and maybe
> just switch the hsync and/or vsync polarity ( from +vsync to -vsync,
> for example). Any idea?
Chances are high. The Sun monitor needs a csync signal, so it's possible
that the adapter makes it with two resistors:
VGA -------------------> 13W3
hsync -->--[100R]--\
+----> csync
vsync -->--[100R]--/
Just use a multimeter and the connector pinouts available at
http://www.monitorworld.com/Cables/video_standards.html to find out. Or
simply open the adapter, if at all possible.
> Again, could any of the above fry the video card if set up wrongly?
I don't think you'll fry your monitor, as long as you switch it off (or
disconnect it) if you see that the video mode doesn't work. For the video
card: as long as you don't short-circuit the outputs, you should not be
able to fry it. With a little knowledge in electrical engineering and a
lot of common sense, you will be able to manage. No guarantees, however!
Erik
--
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands
Phone: +31-15-2785859 Fax: +31-15-2781843 Email J.A.K.Mouw@its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/
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