It looks like some time after the PDP-6 went away, someone added a
check to .ACCESS to ensure it's only used with disk files and USR
jobs. I believe PDP6 jobs should be allowed too.
The code to share a moby was commented out, presumably because the
10-11 space until 1981 was 2,,000000-2,,777777 and PDP-6 core was at
3,,000000 but that went away 1978.
This adds an assembly time conditional for the code.