At the very least, 4.2BSD had them for telnet and rlogin. They were static, though. You had to MAKEDEV enough units.

Warner

On Fri, Aug 15, 2025, 5:00 PM ron minnich <rminnich@gmail.com> wrote:

That was my guess. I figured the people who did the work are on this list, and primary sources rule.

On Fri, Aug 15, 2025 at 3:56 PM Ron Natalie <ron@ronnatalie.com> wrote:
I think that wikipedia history is somewhat garbled when it comes to the UNIX implementations.