Found the following in one of the ati updaters readme which may offer some clues to the issues that have to be overcome when using the xclaim tv with a beige G3:
Apple Video Player and XCLAIM TV-G3
When using the Apple Video Player with XCLAIM TV connected to a G3 system, click on S-VIDEO then click on TV to properly see XCLAIM TV's output.
XCLAIM TV-G3 and Multiple Monitors
If a video card other than XCLAIM VR is installed in your G3 system, the following requirements are necessary for Xclaim Video Player to work correctly:
1. The monitor connected to the G3's onboard video must be selected as the primary monitor. To do this, open the Monitors & Sound control panel and drag the menu bar icon to the monitor connected to the G3's onboard video.
2. The Xclaim Video Player window must appear on the monitor connected to the G3's onboard video.
I think the second requirement (G3 and Multiple Monitors) is the key to the problem. I am not sure about this but my understanding is that the way the xclaim tv pod works is that it only displays tv to the monitor that the tuner pod is actually attached to. In other words, if you have the xclaim compatible Rage 128 VR installed with the pod attached to that, the monitor must be connected to that card for tv viewing. Likewise, if you have the xclaim pod attached to the Beige G3's onboard video connections, then the monitor for viewing tv must be connected to the Beige G3's onboard video connection. Stated another way, if you have any video card other than than the Rage 128 VR and only one monitor, the only way to use the xclaim pod on the Beige G3 is to make sure to have the monitor attached to the onboard video and not the installed video card. Of course, you could still make use of the installed video card by attaching a separate second monitor to it.
Also, there is one hardware issue that some may not be aware of. You can't use regular s-video cables with the pod. Instead you must use a special enhanced 7-pin s-video cable(http://www.svideo.com/7pinto7pin.html) which provides power to the pod. These cables often go missing when used xclaim pods change hands. I don't know if these cables are still available from ATI and the only other source was svideo.com and they have discontinued them.
Apple Video Player and XCLAIM TV-G3
When using the Apple Video Player with XCLAIM TV connected to a G3 system, click on S-VIDEO then click on TV to properly see XCLAIM TV's output.
XCLAIM TV-G3 and Multiple Monitors
If a video card other than XCLAIM VR is installed in your G3 system, the following requirements are necessary for Xclaim Video Player to work correctly:
1. The monitor connected to the G3's onboard video must be selected as the primary monitor. To do this, open the Monitors & Sound control panel and drag the menu bar icon to the monitor connected to the G3's onboard video.
2. The Xclaim Video Player window must appear on the monitor connected to the G3's onboard video.
I think the second requirement (G3 and Multiple Monitors) is the key to the problem. I am not sure about this but my understanding is that the way the xclaim tv pod works is that it only displays tv to the monitor that the tuner pod is actually attached to. In other words, if you have the xclaim compatible Rage 128 VR installed with the pod attached to that, the monitor must be connected to that card for tv viewing. Likewise, if you have the xclaim pod attached to the Beige G3's onboard video connections, then the monitor for viewing tv must be connected to the Beige G3's onboard video connection. Stated another way, if you have any video card other than than the Rage 128 VR and only one monitor, the only way to use the xclaim pod on the Beige G3 is to make sure to have the monitor attached to the onboard video and not the installed video card. Of course, you could still make use of the installed video card by attaching a separate second monitor to it.
Also, there is one hardware issue that some may not be aware of. You can't use regular s-video cables with the pod. Instead you must use a special enhanced 7-pin s-video cable(http://www.svideo.com/7pinto7pin.html) which provides power to the pod. These cables often go missing when used xclaim pods change hands. I don't know if these cables are still available from ATI and the only other source was svideo.com and they have discontinued them.