The ethernet adaptor he needs is one of the "USB->Ethernet" dongles supported by the Rio Central, which is one of the following, according to the "About" menu:

Dlink DU-E100
Linksys USB10T
Linksys USB100TX

There might be others that work if they contain the exact same chipsets as the ones listed above. Although that's really tricky under Linux, my USB10T ended up not working because Linksys changed the chipset without changing the box or the model number. So I had to mail my USB10T to Englad so that Hugo could crack it open and determine the chipset in order to add code for it to the Central.

Anyway... those things are relatively inexpensive for anyone interested in donating one to Rob.
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Tony Fabris