Subject: Re: How to: Connect a VR290 to a PC.
To: Thomas S. Traylor <>
From: Karl Maftoum <>
List: port-vax
Date: 06/30/1997 20:56:32
On Sun, 29 Jun 1997, Thomas S. Traylor wrote:

> I know this is a bit off the topic.  But, how do you get a VR290 to
> work connected to a PC?  I know that there is some sync problems to
> over come.  Has any one successfully done this.  

Yes it can be done, no I haven't done it, although I have investigated 
this option. It basically depends on how much you would like to spend, as 
you probably know the VR290 is a fixed frequency sync-on-green monitor. 
There are purpose built video cards for a PC which allow you to run these 
monitors in most resolutions, I know mirage sell some of these These are modern cards being PCI with ET6000 
chipsets etc... 

The other cheaper option is to connect it to your existing video card, if 
you card can support the 1024x864 @the frequency which I have just 
forgotten :) (54Hz? someone correct me if I'm wrong), you will then need 
to get a cable and circuit to mix the sync signals from the VGA card and 
add them to the green signal, there are various schematics for this 
purpose , just put sync-on-green into a search engine and you'll find a 
few. However the downside to this option is that it won't support dos 
text mode or other video modes, however if you are happy logging in with 
xdm and using X-windows all the time this is an option.



Karl Maftoum
Computer Engineering Student at the University of Canberra, Australia


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