Thanos said:

Here is a pic of the adapter and specs.

Click to expand...

This is probably the most confusing VGA Adapter I ran up to; not the adapter itself but the explanation of "modes."

So here goes - as I have it on my IIfx and used to work on my IIcx (which needs a recapping):

640 X 480 resolution with Sync on Green - for your adapter should be: MODE 1346. If not, then Mode 2346 should work.

Modes 1456 and 1467 (according to the chart) should work as well.

Hope that works for you.