I got my hands on a Zork executable compiled from that Fortran code for DEC's RT-11 OS. I had Unix v6 on a PDP-11/45, so I wrote an RT-11 emulator for Unix in order to run Zork. It was good enough that I could distribute it (via magtape at Usenix meetings, there being no github in 1979.) That allowed an RT-11 shop in Portland to switch to Unix, which created a sysadmin job, which let me move there. Thanks Zork!