Oh thats just beautiful.
I too have a E-ISA build "in progress". Video cards are somewhat lacking in availability. You can literally fill a room with cheap network and scsi e-isa cards, but for some reason video cards never took hold. I mean, video was a major driving factor when it comes to the death of ISA, so you would think video cards would flock to E-ISA, but it didnt happen.
https://stason.org/TULARC/pc/graphics-cards/M … GXE020-A-B.html is what I thought would have jumper settings, but your card looks to be a revision C. It looks like the C revision went jumperless. Knowing Murphey and his law, this card is little more than a paperweight without the special utility to init the card. Maybe this is included with the TIGA drivers?
the actual VGA signal is made in that ACUMOS AVGA1 chip. So for basic VGA work, that chip is doing the grunt work. The ti34020 is just going to sit there until you fire up Auto-Cad or something similar that can leverage that chip. Thankfully the 34020 was relatively popular for its time so there is software for it, just no games AFAIK.
Regardless, it is a beautiful card, and I hope it works.
It is a mistake to think you can solve any major problems just with potatoes.