Fixed Frequency Monitor - Success!

Fixed Frequency Monitor - Success!

Post by Michael Ho » Sat, 14 Oct 2000 13:22:38



Woohoo.

I've got the Fixed-Frequency Monitor (Hereinafter referred to as "The
Curse Of Cthulu") that I was asking about working, running X under
RedHat 6.2 without any problems.

It turns out, after much banging-head-against-wall, that the trick for
separate synch, fixed frequency monitors is to use just about any
valid modeline for the appropriate resolution levels that ends in
"-HSync -VSync".

This last bit is crucial, and I couldn't find it in any documentation
anywhere. Wouldn't work at all before, worked first try after adding that
bit. After it's close enough to be legible, fine-tune the whole thing with
xvidtune.

Having said that, I've got a 35$ ATI Rage Pro video card, and I understand
that this will work for any ATI (Rage or better) card.

I bought this 75-pound, bigger-than-Jesus, black and white monitor for
almost nothing at one of the departmental Get Rid Of All The Old *
sales here at Carleton U - this kind of thing is worth looking into, if
you're looking for something inexpensive and goddamn huge. You'd expect
the Curse of Cthulu to have that last quality, of course, but I'm still
impressed with it.

The specific monitor was a RasterOps SuperScan MC 21M.  It runs at
1152x870, it's about two feet across, and it works like a charm.

Working Modeline(s) available on request. Sorry, but they're not handy.

--
Mike Hoye

 
 
 

1. Fixed Frequency monitor Sony GDM-1963 - partial success

I obtain a stable picture with a very good resolution with one of the
following Modelines:

  Modeline "a" 135 1280 1400 1440 1800 1180 1185 1188 1195 -hsync -vsync
  Modeline "b" 135 1280 1400 1440 1800 1180 1185 1188 1196 -hsync -vsync
  ...
  Modeline "o" 135 1280 1400 1440 1800 1180 1185 1188 1208 -hsync -vsync
  Modeline "p" 135 1280 1400 1440 1800 1180 1185 1188 1209 -hsync -vsync
  Modeline "q" 135 1280 1400 1440 1800 1180 1185 1188 1190 -hsync -vsync
  Modeline "r" 135 1280 1400 1440 1800 1180 1185 1188 1191 -hsync -vsync
  Modeline "s" 135 1280 1400 1440 1800 1180 1185 1188 1192 -hsync -vsync
  Modeline "t" 135 1280 1400 1440 1800 1180 1185 1188 1193 -hsync -vsync
  Modeline "u" 135 1280 1400 1440 1800 1180 1185 1188 1194 -hsync -vsync

The problem is, that after a while the picture starts scrolling up
and that the correct mode is an other one every day.
My interpretation of this is, that

(a) the vertical sync signal isnt understood by the monitor and
(b) the vertical frequency of the monitor depends on temperature.

My temporary fix is the plurality of modes as shown above, such that
I can control the picture by switching modes: ctrl/alt/keypad-
accellerates picture upward and ctrl/alt/keypad+ accellerates picture
downward.
The annoying thing is, that it happens quite often, that the monitor
lies between the modes and therefore the picture cannot be prevented
from scrolling.
Another strange thing is, that when the monitor is very warm,
I see the picture jumping sometimes. Thus the vertical sync _does_
come through somehow.

Any hints?

Max
---

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