3COM makes a 10/100 ISA card. It is a model 3c515. I have used them successfully in a 486/133 Linux box. However, 3COM is very upfront in saying that the card can only do about 20 Mbits/sec due to limitations of the ISA bus. But it will "talk" 100 Mbits, so it should work with your hub.
PS. I found my 3c515 cards on fleabay, and if you really need one, drop me a note. I'm thinking I'm not gonna use them after all).