DEC Rainbow Ethernet Hardware

Greetings I'm looking for any and all information I can find on the DEC Rainbow ethernet cards. I know for sure that two exist, both plugged into the communications slot that most rainbows have filled with a hard disk controller. DEC made one, and Univation made the other. Univation also advertised a ARCnet card, but I found that only in one issue of Digital Review and the next issue moved up to Ethernet. So far all I've been able to find is DECnet DOS/Rainbow 1.0 which might have drivers for the former on it. I've seen no trace of the latter. Also, is there a convenient way to extract teledisk disks these days to something like an image file on Linux/FreeBSD? MAME almost can do this (I can read it in with the Rainbow emulator and diskcopy to a flat file that I can then examine), but I was hoping there was a tar-like tool to do the deed. Warner