Tried c3270 x3270 and tn5250 in ports -current on -current on Dell Inspiron E1045 (dmesg to dmesg@) and all is well.
The 3270 stuff could use an update as 3.4ga9 stable (23. October 2015) from Paul Mattes works better under OpenBSD than prior releases
which fairly regularly dumped core on exit. -- Jack J. Woehr # Science is more than a body of knowledge. It's a way of www.well.com/~jax # thinking, a way of skeptically interrogating the universe www.softwoehr.com # with a fine understanding of human fallibility. - Carl Sagan