DE-250ct Rev-A shared memory mode

Now I have what I consider an interesting question that I hope someone out
there can help me with.
I was setting up a box to use as a firewall/masq, old hd died lol. Now
prev. I was using DE-250ct Rev-B (NE2000 compatible).

I placed one Nic into the box and used an old dos disk to boot run the Nic
config prog. Lo and behold a new option was there I could select ether
"programed I/O mode / shared memory mode" for my data transfer mode. Now
when I selected shared memory mode and attempted to save the settings there
was a notice that I would have to use the NE2000Plus driver. When I boot
Linux 2.4.20 (NE2000 drivers Installed) the Nic is not detected unless I
have the Nic's in programed I/O mode. I am hoping that someone may have an
Idea of a driver to use to receive the performance increase that shared
memory txfr mode would provide.

I have looked over the network and ethernet howto's and some reading on the
net, but i can't find reference to the de-250ct rev-a shared memory mode.
The Nic's are working fine as-is so not a priority. The main chip on the
Nic is the DL3905, the main chip on Rev-B is the DL3907 (Rev-B dosen't
support shared memory access, not sure about Rev-C).

Any help would be appriciated.