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Re: Segfaults when compiling with more memory

I've noticed similar issues before. It's not a problem with simh, but with NetBSD.

Using the 8650 model, disk controllers (UDA50) stopped working with more than 128M (I think that is the limit I discovered). Using VMS, it works fine with 512M of memory.


On 2020-08-14 02:25, John Klos wrote:

1) Hopefully you're working with a SIMH vax from the master branch at

It's the latest SIMH from pkgsrc, which is currently simh-

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.


If you'd like, you can fetch ready-to-use images from the links here:

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

Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email:             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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