Before it goes away, could you take pictures of the circuit boards and dump the
firmware?
These are pretty rare, documentation even rarer. Richard at the computer
graphics museum
http://computergraphicsmuseum.org/ may be interested.
https://terminals-wiki.org/wiki/index.php/Tektronix_4113
On 7
Any interest in a Tek 4113 terminal (minus display)? I have one collecting
dust here and would like to trade for older Tek restoration help / other
pdp11 stuff. The keyboard is damaged but otherwise it's just old and
dirty, haven't opened it up. Located in western Pennsylvania.
thx
jake