# Re: old Radius TwoPage monitor

**URL:** <https://psychtoolbox.discourse.group/t/re-old-radius-twopage-monitor/1356>\
**Category:** Uncategorized\
**Created:** [May 22, 2000, 6:25pm UTC](https://psychtoolbox.discourse.group/t/re-old-radius-twopage-monitor/1356 "2000-05-22T18:25:32Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [May 22, 2000, 6:25pm UTC](https://psychtoolbox.discourse.group/t/re-old-radius-twopage-monitor/1356/1 "2000-05-22T18:25:32Z")

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> \>\>I guess I'll have to go out and buy a monochrome monitor and a ISR video  
> \>\>attenuator.  
> \>\>  
> \>  
> \>I have stumbled on a Radius monochrome monitor that might suit my purposes.  
> \>However, these monitors were usually driven by their own Radius graphics  
> \>card, and the card in this case is missing.  
> \>  
> \>Will this be a problem??  
> \>  
> \>If i understand the ISR video attenuator then all i am doing is combining the  
> \>standard RGB outputs (ie, no need for a special Radius graphics card).  
> \>  
> \>Since the TwoPage Radius monochrome monitor is fixed at 75hz vertical  
> \>refresh, then provided my G3 is running at 75Hz, i should be able to drive  
> \>the Radius monitor with no problems even without its special graphics card?  
> \>  
> \>Is this is correct?

hi david  
  
i don't know. my guess is that you'll run into trouble.  
  
to connect a graphics/video signal to a monitor you need to connect 3   
kinds of synch plus the luminance signal itself. I don't know if your   
synch signals will match what the radius wants. I don't know whether the   
radius monitor uses a standard connector or an odd one that might be hard   
to find. (i vaguely recall once owning the radius TwoPage card and   
monitor, and my vague recollection is that we could only drive the   
monitor with the radius card.)  
  
a second issue is that some cards include synch signals in the video   
signal. this is usually called "synch on green". in that case, unless   
synch is included on all three RGB components, the average created by ISR   
Video attenuator will have a weaker synch component. (the presence of   
synch in your video doesn't matter, per se. the issue is whether your   
monitor insists on getting synch from video, or will accept it on   
separate lines, which bypass the ISR Video Attenuator.)  
  
sorry not to be more optimistic  
  
Your approach would be fine with a standard monochrome monitor, e.g. one   
of the old Apple monochome monitors.  
  
best  
  
denis