I have...
alias vt 'setenv DISPLAY localhost:0 ; /usr/bin/X11/xterm -ibmkbd'
in my .cshrc to give me a window emulating a vt102. From there, I've
telneted to vaxes, and used edt, etc.. with no problems. Check the
xterm(1) man page for info on fonts, colors, and other such modern
niceties ;-)