I have been able to get a !Boot structureless disc with only an obey !Boot file to copy music from my Adjust SA RiscPC to my dad's old 3.7 SA RiscPC over ShareFS and 10BaseT
iirc the command was:
con. internetip 192.168.1.80
or something like that!
the only networking difference I remember was that the 3.7 had no DHCP....but my SA did (and so lived in my car as a screenless music player, where a LAN connection was fed into our garage, to fill it's disc up over night)
I originally found this out to network some machines for a client.