Quoting John C. Hayward,

>    Some other systems (in particular a SUN I am trying to talk with) uses
> talk not ntalk.  

>    Where would be the best place to get the sources for talkd which use
> the older talk protocol for a NetBSD machine?

Unfortunately, Sun still uses the old talk protocol, which I have been told
is broken in a couple of ways. I don't think the old 'talk' was encumbered,
so you could still get it from an old BSD distribution, but I am
not sure. Or have a look at ytalk, which should do both protocols.

- Frank