A4000T monitor

[Matt_H]

@ SirGraham

I don't have experience with the IV24, but it sounds like you can just plug a monitor in there and you'll be set. Remember that most modern LCDs don't display 50Hz signals and that PAL video is 50Hz. The Dell monitor described above *is* 50Hz capable. But also note that unless you're using the framegrabbing capabilities of the IV24, it's sort of redundant as a display card.

Now, the Cybervision. If you've got a monitor attached to the IV24, you're going to have a second monitor (or a switchbox) attached to the Cybervision. More accurately, you should have the monitor attached to the scandoubler. The "Light my fire" screen you're seeing is probably a CyberGraphX bootlogo. CyberGraphX is, essentially, the driver package and API for the Cybervision card. Normally, the bootlogo should disappear when the Workbench appears, but I suspect the previous owner was running this system with a monitor attached to the scandoubler AND a monitor attached to the Cybervision. That means that some screens (such as the bootlogo) aren't closing automatically.

Look for a program called CyberGraphX. It's a configuration tool to set some environment variables for the CyberGraphX driver system. It's usually found in SYS:Tools or SYS:Tools/Commodities.

On the Environment tab, make sure "NOPASSTHROUGH" is disabled. On the Tooltypes tab, make sure "PASSTHROUGH" is enabled. This means that native, scandoubled Amiga video will come through that port *and* video from the Cybervision will be passed through. It allows you to use a single monitor to display Amiga and RTG video, dependent only on which screen is frontmost. You'll need to reboot once these settings are saved.

The next issue is the garbled display you're seeing. I agree with zipper, the configuration of your Cybervision's screenmodes is probably not correct for whatever monitor you're using. The tool for fixing this is CGXMode, normally found in SYS:Prefs. Once you get that open, I suggest picking one of the default sets from the Settings menu. Those are "safe" presets that should work with almost any monitor capable of the refresh rate indicated (use 31KHz to be absolutely safe).

But before you do that, I suggest opening SYS:Prefs/Screenmode. What mode is currently selected? You may want to pick a native mode, such as NTSC (make sure to "Use" and not "Save" for this test), to verify that the scandoubler is working.

[Matt_H]

Hi, again!!!

Everything is ok again. What I've done is to remove that bridge of the Cybervision, plug the Philips monitor in the scandoubler port and the Amiga has booted up with only one monitor. I've made no changes in CGXMode

By the way, I have NOPASSTHROUGH to enabled and PASSTHROUGH to disabled. Should it be the other way round?

Thank you very much for your help.

Salutes from Spain.

:laugh1:

Yes, it should be the other way around. Then you can re-attach the bridge cable and should be able to switch transparently between Amiga and Cybervision graphics modes on a single monitor.

[Matt_H]

Yes:

NOPASSTHROUGH should be disabled
PASSTHROUGH should be enabled
The bridge cable should be connected

Then with the monitor plugged into the scandoubler you should see all of your screenmodes on that monitor.

(Unless the previous owner changed the jumpers on the scandoubler. But let's not consider that for the moment.)

Please try the above configuration and report back.

[Matt_H]

Looks like you're all set with the Cybervision - congrats!

You can read more about the ImpactVision here. I'm assuming you have the A4000 version. The regular version doesn't use all of the pins in the 4000T video slot. It's definitely more of a video processing card than a display card.

So, you're seeing interference when you have both the CV and IV plugged in. I can think of a few possibilities:
-Faulty IV card
-IV is incompatible with CV or CV scandoubler
-IV is incompatible with 4000T's multiple video slots and is getting confused
-Grounding/earthing issues

You might be able to diagnose most of these issues by trying the card in another Amiga, but otherwise I think it will be a difficult process to figure out what might be happening.

Having recently installed a CV and scandoubler combination, I know that it's incredibly difficult and frustrating to insert and remove them together, so now that they're installed I suggest leaving them exactly where they are. Unfortunately, that makes determining the IV card issues more of a challenge.

[Matt_H]

@ SirGraham

Happy to help! Sorry the IV is proving so hard to get working. I'm pretty much out of ideas on that front. Maybe if a manual turns up it will provide some other insight. The only other thing I can think of is to try it in the other video slot, but that requires moving the CV and scandoubler, which is a frustrating thing to do.

As slaapliedje says, there must be some RAM on your accelerator if you're seeing 64MB. The motherboard RAM slots max out at 4MB each (16MB total). You can see the various chunks of RAM in your system by running SYS:Tools/ShowConfig. It's just barely human readable, but it will tell you (for example) that you have 8MB at one address, and 32MB at another address, and 2MB at a third address.

If you report back with your accelerator model we can tell you more. Or you can look it up on the site I linked earlier.