My guess is that it was for some sort of lvds monitor in a luggable.

Did you link to the correct page on VGA legacy?
I got this:
http://www.vgamuseum.info/index.php/component … nologies-f65550

All those cards appear to have some kind of Video in/out capability.

That golden RCA connector and probably some proprietary breakout cable for the middle connector.
Should be interesting what happens if you attach a TV to that RCA connector - many TVs should still offer that input, maybe via a SCART adapter.

Video I/O was rather early or exotic, that being from 1996. Maybe they screwed that up somehow.

That small AD chip on yours in the upper left corner seems too primitive to provide a "video out" all on its own.
OK, that's what it does:
https://www.mouser.de/datasheet/2/609/AD724-1501848.pdf
But part of the work will be done by the main chip, other than VGA.
Maybe that's prompting it to provide some exotic VGA modes or messes with DDC communication.

At 1996, it's probably still older than any of you TFTs?

I don't think it's a malfunktion, but if so, there might be one that fails to get the monitor started, not providing a certain signal.
That would fit the fact that the capture device still gets a picture.
Someone here will know much more about such things.

What I would try:
Install that thing in a more modern windows system along the main card, use it as a secondary VGA and see if you'll get a picture at certain settings. If you manage to find a driver...

Check the timings the video capture card was seeing when connected and share them .

My guess is that the VGA card is preconfigured to work with some old RGB fixed sync CRT monitors from the likes of Apollo, HP, Sun, etc .

EDIT: Or maybe it is something from the medical field

yeah, I'd asume some non standard fixed sync signal too, can you check what exactly the signal is with your capture?

Cuttoon wrote on 2022-03-06, 18:47:

Did you link to the correct page on VGA legacy? I got this: http://www.vgamuseum.info/index.php/component … nologies-f65550 […]
Show full quote

Did you link to the correct page on VGA legacy?
I got this:
http://www.vgamuseum.info/index.php/component … nologies-f65550

All those cards appear to have some kind of Video in/out capability.

That golden RCA connector and probably some proprietary breakout cable for the middle connector.
Should be interesting what happens if you attach a TV to that RCA connector - many TVs should still offer that input, maybe via a SCART adapter.

Video I/O was rather early or exotic, that being from 1996. Maybe they screwed that up somehow.

That small AD chip on yours in the upper left corner seems too primitive to provide a "video out" all on its own.
OK, that's what it does:
https://www.mouser.de/datasheet/2/609/AD724-1501848.pdf
But part of the work will be done by the main chip, other than VGA.
Maybe that's prompting it to provide some exotic VGA modes or messes with DDC communication.

At 1996, it's probably still older than any of you TFTs?

I don't think it's a malfunktion, but if so, there might be one that fails to get the monitor started, not providing a certain signal.
That would fit the fact that the capture device still gets a picture.
Someone here will know much more about such things.

What I would try:
Install that thing in a more modern windows system along the main card, use it as a secondary VGA and see if you'll get a picture at certain settings. If you manage to find a driver...

Thank you, I edited the link.
Finding a driver might be hard while it's integrated in W98. And it's a 96 card. Yes, my TFT's are from 2003 at best. I don't have CRTs. I'll first try to see if my capture device (USB3HDCAP) can give me some information on the input, like some people here suggested, but i tried already and didn't find in OBS. I'll try with the provided software (Streamcatcher).

JustJulião wrote on 2022-03-06, 22:57:

Finding a driver might be hard while it's integrated in W98. And it's a 96 card.

If you look for the chip, you'll find some drivers for XP at least:
https://de.driverscollection.com/?H=65550%20P … %20Technologies

Win XP might be something of a sweet spot for auto detection and drivers of 90s stuff?

Could also be that some recent Linux "fire and forget for dummies" distros like Ubuntu are pretty fit, especially for arcane pieces.
If so, a live CD and internet connection would already suffice.

But, I don't know. Someone here will have figured all that out, at some length.

Pretty sure the same chipsets were used in Toshiba laptops back in the day. An external monitor connected to the VGA port had to be activated either with a special keypress or in the C&T windows software.