Common issue with failing to initializing the video card's bios and some controllers. I seen this happen on early pentium boards too.

I suggest trying S3 trio 64V+, Virge DX or Cirrus logic 5436 or 5446 even riva 128 PCI. Most compatible with 486 board and necessary since many early DOS games will not work with Matrox and ATI video cards.
Not the much later video cards like you have or any rage cards. These ones I suggested are more older.

Also depends on what type of SCSI cards PCI. May need to try older or much later ones. But I know that works very well is 3ware PCI 2 port ATA card and 3ware 2 port SATA even it has PCI-X, I had it plugged into PCI slot and still works. This works great on my older less compatible Proliant 1500.
Using 3ware card and any hard drive for DOS even hard drive is 25GB, is still bootable on 2GB partition up to four 2GB partitions created using DOS 6.22.

Cheers,

Some older boards don't supply 3.3v to the pci slots. That's why the cards don't work. You can fix this by installing a 3.3v regulator and connect it to the corresponding pins.

Maybe also check PCI divider. If you use 33MHz bus speed, use 1:1.

Keep in mind consumer boards never had 3.3V PCI ever due to position of PCI key, 5V only. Many server boards that does usually includes PCI-X has 3.3V due to the slot keying as well.

Again bearing saying again: Secondly, sometimes certain motherboards does not have 100% compatibility with many cards especially PCI video cards. More problematic if overclocking using 83MHz fsb will shut down some PCI cards where 75MHz has more success. Even more matters when you have 486 PCI board and many early pentium boards. Even my Micronics HX chipset ATX has same problems. While TX chipset board works with more cards.

If running 40MHz or 50MHz 486DX you need to change PCI divider. Running 33MHz or less is most compatible and any dividers other than 1:1 will make PCI even slower should work still.

But this is all moot if certain video cards cannot initialize at all on start up to get into bios screen. Try another video card from that list as I suggested.

Virge DX2 is same chipset based on GX2, too new.

Cheers,

pentiumspeed wrote on 2022-03-07, 21:45:

But this is all moot if certain video cards cannot initialize at all on start up to get into bios screen. Try another video card from that list as I suggested.

Thanks, i keep my eyes open for these cards you mentioned. Whitch one is the most compatible in DOS games?