I have never seen a version of NCSA Telnet that had a PPP or SLIP implementation built in. Every version I ever came in contact with used MacTCP.
Yes, there was an earlier NCSA version that pre-dated MacTCP. I think it used an AppleTalk to IP bridge or gateway.
DogCow, what ever happened to the internet tools you were developing for early Macintoshes that we were testing for Lisa compatibility? Do you have this special version of NCSA Telnet in your download vault on the MacGui site?
That project stalled for lack of available time to work on it. It's not dead, and I do want to complete it, I just don't know when. We spent a lot of time on that, and I hope to pick it back up some time.
I'm not sure if I have that special NCSA Telnet application in the Vault. I remember looking for it a few years back, but I don't recall if I found it or not.