Which name does the Poseidon SANA-II driver have?
Since Roadshow on 68k does not have a GUI to select the driver with, adding the driver's name to the configuration file by means of a text editor should help to avoid that SNAFU 
If you can tell me the name of the driver, I'll add another ready-made configuration file for it right now.
It seems that typing even though it doesn't exist physically should do the trick, so it should be:
"Devs:Network/dm9601eth.device" for Davicom (or should it be usbdm9601eth.device?)
"Devs:Network/usbasixeth.device" for Asix
"Devs:Network/usbpegasus.device" for Pegasus
"Devs:Network/usbmoschipeth.device" for MosChip MCS7830
I have a pair of asix adapters but I won't have access to my Deneb until weekend.
I can't remember if there are more drivers.
I could help with a Reaction/ClassAct GUI and give all the rights to Olaf Barthel although I don't think I have a lot of time to do it until christmas.