I try to do a simple echo test, based on this:
http://www.psych.usyd.edu.au/pdp-11/hints.html
simply tested by depositing 060 (octal) into its 'transmitter buffer ', 0777566 (017777566 for 22 bit machines) in the case of the console.
But in the DLV11-J_Users_Guide they use 177566 for XBUF...