I'm actually running an old CIT-101 from c.itoh. The pdp11 is currently just simh on a raspberry pi, but I have a lot of pdp11 hardware in various states of disrepair. my 11/73 ran 2.11bsd nicely has a burned out power supply and I haven't been able to fix it.
I checked out the curses man page in 2.11 and tried to use curses clear, but it really does tack on a lot of overhead & slows things down. So I'm now tempted to just cheat, keep it simple, find a simple escape string that works on real vt100s as well as xterms, etc. and just printf it.