On Fri, May 8, 2015 at 12:49 PM, Henk Gooijen <henk.gooijen at hotmail.com> wrote:
  Do you want it with the original Z-machine
implementation? Otherwise
 just grab ZEMU and the Zork I binary, and start playing. 
I've been mining my own mailbox here, and I am now refreshed of a
64-message thread 5 years ago about ZEMU, in particular, that it does
not compile under RT-11 v5.3 owing to SYSTEM.MLB, but it compiles fine
under RT-11 v5.7.
I do *not* know how that maps to versions of RSTS/E.
-ethan