Thomas, I'm not sure where you got that list from.
It seems slightly mismatching what I can find. Looking at the NRT code 
in RSX (which uses object 23, and is shared by code in RSX for 
connecting to both RSTS/E, VMS and Tops-20), I find this:
1  RT-11
2  RSTS/E
3  RSX-11S
4  RSX-11M
5  RSX-11D
6  IAS
7  VMS
Those are the documented values for the configuration message that I can 
find.
However, extrapolating from this, in NFT/FAL, there is a much more 
extensive list, which seems to align with this list, which contains:
8  TOPS-20
9  Tops-10
10 RTS-8
11 OS/8
12 RSX-11M-PLUS
13 COPOS/11 (TOPS-20 frontend)
14 P/OS
15 VAXELN
16 CP/M
17 MS-DOS
18 Ultrix-32
19 Ultrix-11
20 DTF/MVS
25 Windows NT
26 Linux
Now, Linux is a value I believe I added just based on observation, so 
it's much less official. But I think all the other ones are ones DEC did 
assign. Unfortunately, I think Windows NT was also added by me, based on 
observation of Pathworks. So I do not know what the values between 20 
and 25 could/should be.
But maybe this helps some anyway?
   Johnny
On 2021-11-07 11:23, Thomas DeBellis wrote:
  Since its inception, Kermit-20 (one the first three
Kermit 
 implementations) has had the 'limitation' that it will only talk to a 
 remote Kermit via a physical terminal line (I.E., something like 
 TTY6:).? It doesn't do network terminals in part because it has no code 
 to handle the out-of-band or meta-data that one finds on TVT's (like 
 IAC's) or CTERM's.
 
 This doesn't exist for the early NRT terminals which were implemented 
 for Tops-10 and Tops-20.? Once you've read the initial configuration 
 message and decided what to do, you basically never have to bother with 
 meta-data.? Because I'm trying to look at an NFT issue between Tops-10 
 and Tops-20, I needed another transport mechanism and modifying 
 Kermit-20 to do DECnet 36 NRT's seemed like an easy hack.? Since Tops-10 
 Kermit isn't making an outgoing connection, it is none the wiser.
 
 Thus far, it has been fairly straightforward.? Right now I'm just 
 catching the few cases where certain operations don't make sense or 
 otherwise wouldn't work (like setting the terminal speed). Another thing 
 I'd like to prevent is Kermit-20 bothering non-36 bit systems.? This is 
 easily enough done by checking some 'magic' bits in the initial 
 configuration message and restricting by OS type.? This raises two 
 questions:
 
 First, is the list below complete?? What about Ultrix and ... what else?
 
      ?1??? RSTS ?2??? RT-11 ?3??? RSTS/E ?4??? RSX-11S ?5??? RSX-11M
      ?6??? RSX-11D ?7??? IAS ?8??? VMS ?9??? TOPS-20 10??? TOPS-10 11   
     RTS-8 12??? OS-8 13??? RSX-11M+ 14??? MCB
 
 Second, the configuration isn't well documented.? Actually, I'm not sure 
 if it's documented, period.? All I have is are some notes that Johnny 
 wrote up in the process of reverse-engineering it and very kindly gave 
 me.? They are certainly fine for this particular implementation, but I 
 was just wondering what else there might be. Plenty for LAT and CTERM, 
 but I don't think I've stumbled over NRT.
 
  
-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol