While looking for DECnet documents, I noticed that there's a very large collection at http://manx.classiccmp.org/collections/antonio/dec/ . Probably not news to many, but in case some had not seen it... Among other things, there are two CD collections MDS-1997-10 and MDS-2000-01. The former contains a rather obscure document, the DECnet Phase IV Token Ring datalink spec. That also includes the Phase IV routing layer tweaks necessary to support token ring -- or other datalinks if you don't want to use the AA-00-04-00 prefix. paul