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'[EE]:fixed frequency monitors'
2001\10\22@115445 by sam woolf

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Does anyone know how to hook a fixed frequency monitor up to a PC? Its a sony made sun GDM-1604-40 and it has 4 connectors at the back (R,G,B and Sync). I managed to find a cable that goes from PC SVGA to 5 connectors which I beieve are suppossed to be for monitors that split the sync signal into Horizontal and Vertical components. When I link it up though I just get a screen full of random colours. Is there any way of adapting this 5 connector cable into the correct 4-connector one (do I need to somehow combine the horizontal and vertical sync signals?). Do I need to do anything else? Do I need a special video card to make it work? Do I need to make a  special PIC circuit to fool the monitor into thinking its getting the right signals? Any advice greatly appreciated!
Sam.

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2001\10\22@134850 by Markku Venalainen

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>Does anyone know how to hook a fixed frequency monitor up to a PC? Its a
sony made sun GDM-1604-40 and it has 4 connectors at the back (R,G,B and
Sync).

The short answer is, use a fixed frequency video card.

But given that fixed frequency video cards are rather expensive, you COULD
try running it with your PC's video card. The thing to understand is that
the monitor will ONLY run at ONE frequency (hence the name). Anything else,
and you get pretty colored patterns all over the screen. In your case, the
GDM-1604-40 runs at 61.8kHz horizontal, with a vertical refresh of 66Hz.
Using the advanced settings for your video adapter, you may be able to set
both horizontal and vertical refresh rates (ATI video cards, for example,
tend to be good at this). Alternatively, you may be able to set the
vertical refresh to 66Hz at some screen resolution that causes the
horizontal to settle at 61.8kHz. Many newer monitors will display 'current'
refresh rates in the on-screen menus, which is especially useful for this.

Once you have the refresh rate set, unplug your 'normal' monitor, and plug
in the GDM. It will either work, or not. If it works, you can save those
screen settings as your Windows default, and it wil be almost like a
regular monitor. Why not completely, you say? Well when your PC starts, the
text screen and the Windows startup screen will probably be at incorrect
refresh rates and will show as garbage. Once Windows starts, you'll be OK
again. Also, many games change the screen refresh rate when they start, so
you may find that when you start a game, you lose your display. Just don't
put your 'normal' screen too far away, or memorize the keypresses to get
back to the Windows screen.

For more information, check http://www.si87.com/ or search for either
"fixed frequency monitor" or "fixed frequency video card".

Good luck!
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Markku

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2001\10\22@142940 by Jerzy Wilder

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But if is fixed frequency monitor you have only one choice
to combine H-sync and V-sync, for GDM monitors(from Sony) H-sync is 64kHz V-sync is 60Hz and if you need schamatics
please send me e-mail www.jerzyspamKILLspamsangate.com">http://.....www.jerzyKILLspamspam.....sangate.com or call
508.490.7931
jerzy


{Original Message removed}

2001\10\23@012115 by Timothy Stranex

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Or you could just run Linux and change the modelines for X.

Timothy Stranex
Durban, South Africa
EraseMEtimotspam_OUTspamTakeThisOuTbtgnet.co.za

Markku Venalainen wrote:
{Quote hidden}

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2001\10\23@045616 by Vasile Surducan

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I'm curious too, to see how other worldwide people are solving this
problem. Thanks in advance.
Vasile

On Mon, 22 Oct 2001, Jerzy Wilder wrote:

> But if is fixed frequency monitor you have only one choice
> to combine H-sync and V-sync, for GDM monitors(from Sony)
> H-sync is 64kHz V-sync is 60Hz and if you need schamatics
> please send me e-mail KILLspamwww.jerzyKILLspamspamsangate.com">http://RemoveMEwww.jerzyTakeThisOuTspamsangate.com or call
> 508.490.7931
> jerzy
>
>
> {Original Message removed}

2001\10\23@093355 by Olin Lathrop

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> I'm curious too, to see how other worldwide people are solving this
> problem. Thanks in advance.

I don't use fixed frequency monitors.  The newer PC monitors are far cheaper
than the old fixed frequency ones from Unix workstations and the like.  It
just doesn't make sense to fart around with a fixed frequency monitor when
nice 19 inch multi sync monitors are now readily available for under $300 in
single quantities.  It will cost more than that to rig up something to make
use of a fixed frequency monitor.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, spamBeGoneolinspamBeGonespamembedinc.com, http://www.embedinc.com

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2001\10\23@121704 by Andrew E. Kalman

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Re:

>I'm curious too, to see how other worldwide people are solving this
>problem. Thanks in advance.

Two suggestions:

1) Use it on an older Mac (e.g. a PowerMac 7200). They work well with
fixed-frequency monitors. I have one driving a mid-80's vintage
Mitsubishi monitor at 1024x768 at 75Hz (or was it 72Hz?).

2) Use it as a second monitor under Windows 98 or higher to expand
your desktop. To do this, just pop in a second graphics card. You can
do AGP + PCI or PCI + PCI. In Win98, the "main screen" will be the
one connected to the graphics card that's functioning as the "primary
adapter". If your system has only PCI video cards, then the primary
one will be the one with the lower IRQ. You'll need a multisync on
the primary adapter because of all the text-mode messages you get
when booting Windows, but all you really need on the secondary (and
tertiary, etc.) adapter(s) is a single fixed frequency display
(assuming you "stay in WIndows" for everything you do in that
display).

Cheers,

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  Andrew E. Kalman, Ph.D.   RemoveMEaekspamTakeThisOuTpumpkininc.com

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2001\10\23@154318 by Peter L. Peres

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Figure out the polarity of the sync signals and build a small combiner box
(probably two diodes and a resistor) to form an OR or NAND between the
signals to get what you need.

Also search the web for diy "VGA to TV" connections, these have what you
want.

Peter

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2001\10\24@040513 by Vasile Surducan

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Olin, have you thought what's happened with old monitors ?
That you're droping to the garbage !
It comes on the third world countries and some guys like me are working to
transform them in autoscan monitors. For example Compaq 21 inch
fixed frequency monitors for workstations could be transformed ( with some
work ) in PC compatible. Also, all monitors coming from US as "not
reparable" are repaired ( most of them without any schematics) and sold to
the people.
With all respect, you are doing the same mistake like all
americans, you don't know ( and the problem is you don't want to know
) there are countries in which 300 $ is less then a monthly sallary.
So here, where all guy's involved in electronics are smart, the working
costs does not means anything.
As another example, here a new modem (type A) for a rented telephone line
it costs about 120$, a normal modem ( type B )it cost 30$ and I have
requests to transform the type B into type A for about 20...30$ using a
single pic and some inteligence.
For an american is probably hard to understand, for a third world engineer
is very easy. Remember the question with Somalia I've asked ?
If any american will live just one month in a poor country and earn
his money like there, the world could be different.

Best regards for you,
Vasile

On Tue, 23 Oct 2001, Olin Lathrop wrote:

{Quote hidden}

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