[HECnet] Linux NRT configuration message

In my changes to Kermit-20 and SETHOST, I check the configuration byte to make sure that I'm communicating with either a Tops-10 or Tops-20 system.  If it's not one of those, then I want to give a nifty, informative error message, such as: Kermit-20>connect APOLLO:: ?VMS type systems do not support Tops-10/20 NRT communications. Kermit-20>connect MIM:: ?RSX-11M type systems do not support Tops-10/20 NRT communications. Kermit-20>connect TRON:: ?RSTS/E type systems do not support Tops-10/20 NRT communications. Pretty nifty.  I do this by doing a lookup into a handy table, indexed by the OS type, viz: hsttyp: eascii <RSTS>           ;^d0         eascii <RT-11>          ;^d1         eascii <RSTS/E>         ;^d2         eascii <RSX-11S>        ;^d3         eascii <RSX-11M>        ;^d4         eascii <RSX-11D>        ;^d5         eascii <IAS>            ;^d6         eascii <VMS>            ;^d7         eascii <TOPS-20>        ;^d8 (TOPS20)         eascii <TOPS-10>        ;^d9 (TOPS10)         eascii <RTS-8>          ;^d10         eascii <OS-8>           ;^d11 (!!)         eascii <RSX-11M+>       ;^d12         eascii <MCB>            ;^d13 (the DN20!!) hsttyn=.-hsttyp-1               ; Number of defined operating system types So if the number I get is outside of this range, I give an unknown error, such as: Kermit-20>connect ZITI:: ?Remote system sent an illegal configuration message ZITI:: shows as a Linux system.  Does anyone know what its configuration byte would be?  How about Windows?  Ultrix?  Any others? I don't recall whether we used NRT or CTERM to get into our Ultrix machine (it was an 8650, consequently upgraded to an 8700).  I think we used TCP/IP TELNET.