anybody running multiple protocols on a single cable?

[Henry Spencer]

Given that multiple protocols can co-exist if their type numbers don't
clash, does anybody have a list of in-use type numbers?  The mumbles
in my old copy of the Ethernet spec suggest that Xerox was trying to
maintain a master list; is it accessible?  Failing that, does anybody
know if there are specific protocol number(s) reserved for site-specific
protocols?  We may have to implement one, and I'd prefer to leave the
door open to TCP/IP etc. on the same Ethernet.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry