After I put the changes into Tops-20 Kermit to recognize Ultrix and properly check protocol, I finally got around to testing it against few hosts on HECnet.  As I had dimly recalled from the late 1980's, Ultrix supports Tops-10/Tops-20 NRT, viz: Kermit-20>c nofar/st [Remote system *NOFAR*:: is running _ULTRIX-32_] [KERMIT-20: Connecting to DECnet node NOFAR::] and also: Kermit-20>c ostara/stay [Remote system *OSTARA*:: is running _ULTRIX-32_] [KERMIT-20: Connecting to DECnet node OSTARA::] Sure made my day! When I finish wringing some more bugs out of Kermit-20 (I'm redoing the parity routines to use string instructions), I'll see about testing against Ultrix in addition to Tops-10 and older versions of Tops-20 Kermit (I've got them going back to the 1980's) SETHOST currently cannot connect to these hosts as it reports incorrect configuration messages.  That's probably an easy enough fix.