Back in college I ended up rooming with a bunch of unix neck beards and we used a vt320 as our "house control system." It controlled a rack in the basement hooked up to sound systems, tv remote controls for the living room entertainment systems which included a 70in crt monitor that played movie rips from network storage. Fun times.
You can put two of these back to back with the transmit and receiver wires crossed, and type straight from one to the other. Did this as a kid to chat with my little sister in another room.
Here are my links for roms and docs:
http://www.bitsavers.org/pdf/dec/terminal/
https://github.com/larsbrinkhoff/terminal-simulator/issues/1
https://www.mail-archive.com/simh@trailing-edge.com/msg09086...
https://forums.bannister.org/ubbthreads.php?ubb=showflat&Num...
https://simh.trailing-edge.narkive.com/qgzCvrl8/dec-vt-emula...
I have a bunch of PDFs in along with this, and a vt240.zip that must have come from one of the above.
I also used this command line call to get the terminal running with "bitbanger."
But most programs ignore termcap these days which is a huge issue. Running stuff through tmux helps but it's not ideal.
That'll be SIGINT, but I understand, he just tests whether we pay attention.