If "DerBaum" finds the correct jumpering for 8-bit operation of the Trident, you can still resale or return the 8-bit VGA...

Loic74650 wrote on 2023-09-07, 18:34:

Thank you @DerBaum, that would be awsome.
Note that I just acquired the VGA card advised by @majestyk (https://www.ebay.com/itm/385932205291)...

Wow. that thing looks... really old 😁
256k memory?

I will start some test with the cards. 👍

DerBaum wrote on 2023-09-07, 18:49:

Wow. that thing looks... really old 😁
256k memory?

For editing BIOS setup it´s good to go.

And AFAIR most 8-bit VGA cards are indeed quite old.

On my side I just tried various jumper settings on the VGA card with no success.
Curious to see @DerBaum if you have more luck.

Ok.
I have good news (for you) and i have good news (for me).

All of these cards except the one on the left are 8 Bit compatible... including YOUR CARD.
center ones are 512k and the tseng is 1mb. Ignore the "A+" its just an internal marking for me wich ones have a good picture quality.

(sorry for the dim picture, i took it exactly at the moment it appeared on the screen and it wasnt fully there. Its normal brightness.)
I have removed the sticker to see the 8 Bit configuration and it works after i jumpered it correctly!
Have a look at all the 7 jumpers ( on top , near the ram and near the isa connector).

Many thanks for your time.
Unfortunately no such luck on my side. Still no VGA signal detected by the monitor.
I am wondering if that means the VGA card is dead or whether the issue is with my backplane/setup? Should the video card output a signal even if the SBC is not installed in a slot (I tried but nothing either)?
Attached are photos of the backplane from which the SBC was pulled out and with which I am making my tests. Very rudimentary.

Loic74650 wrote on 2023-09-07, 20:49:

Unfortunately no such luck on my side....

Have you checked all jumpers?
The 3 near the ISA slot closed.
the 2 near the ram open.
The top ones (bottom of the top ones closed. upper one open?
At first i forgot to open the jumper at the lower ram chip and it didnt work. after i opened it , it worked.

A backplane is nothing fancy. just some isa slots in parallel and some power to it.
All my backplanes look quite similar.

Loic74650 wrote on 2023-09-07, 20:49:

...should the video card output a signal even if the SBC is not installed in a slot (I tried but nothing either)? ...

no. in my test the monitor always stayed in standby when something wasnt right.

I did carefully check and double checked all jumpers again. With no success.
Am waiting for an 8 bit VGA card...
Thanks
Loic

I saw i made a mistake (but it worked anyway) J4 should be closed in 8-Bit mode.

Greetings,
Making some progress... I received another 16bits video card from Trident (HNG890CL-BBD1TIA1) with similar jumpers as on other Trident card, and this time it worked!
Next steps I will get into the BIOS and see if I can reconfigure that equipment.
Many thanks for the precious help!
Loic

Greetings All,
Today I got my old equipment running again after successfully replacing the cell battery of the SBC and setting up the BIOS correctly, thanks to the latest video card I received and all your wonderful help.
Many thanks again, much appreciated.
Loic