Hello,
1) Hopefully you're working with a SIMH vax from the master branch at
https://github.com/simh/simh
It's the latest SIMH from pkgsrc, which is currently simh-4.0.0.20180919.
2) You should be able to pick a simulator from there and configure it
effectively the same configuration as your physical machine (there are
many vax simulators that are now provided).
If you can reproduce the failure, I'll track down what is or isn't
working.
Thanks!
If you'd like, you can fetch ready-to-use images from the links here:
http://mail-index.netbsd.org/port-vax/2020/08/13/msg003608.html
vax.ini is set to 128 megs, so compiling Perl should work. Changing that
to 256 megs should cause Perl to fail at regexec.c.
John Klos