I have
recently stumbled on large stash of MicroChannel Ethernet Cards.
  I'm thinking of taking the whole bunch (brother & I have a large ps/2
  colelction), but would have leftovers for all to partake in.  I heard
  these are generally hard to find, so let me know if you're interested.
     Ah yes, if I remember, they're various makes & models. 
 keep a lookout for cabletron and 3com 3c509 models. you will have the least
 compatibility problems with those two NICs and they even work in os/2 most
 MCA T/R NICs will have a 16/4 sticker on them which is a dead giveaway for
 token ring.