zapper wrote:

this is a little error that I ran into... […]
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this is a little error that I ran into...

MIXER:Got different values from SDL: freq 44100, blocksize 512
ALSA:Can't subscribe to MIDI port (65:0) nor (17:0)
MIDI:Opened device:none

The above messages should normally leave you with 'no sound', but not crash DOSBox. Does the crash occur only with Jazz Jackrabbit or even before the proper startup of DOSBox itself? In case of the latter, the crash maybe on account of issues/incompatibilities between dosbox & its dependencies in the debian stretch(testing) repository rather than with dosbox itself. It will be difficult to identify the issue without more details about the crash and further debugging by (interested)developers.

I found this post from a Google search as I am running Debian stretch and was also trying to load up Jazz Jackrabbit. I was getting "DRC64:Unhandled memory reference" and I saw that message by running DOSBox from the terminal.

I fixed it by running:

1gedit ~/.dosbox/dosbox-0.74.conf

...then changing core=auto to core=normal.

That's a workaround, not a fix. My guess is one of the 'security measures' enabled by default on the distro is interacting badly with dynamic core. I'm not a security aware guy so i'm unaware of specifics.

I found this bugreport on debian.org, there is a method explained, how to downgrade to the old version.
With core=normal, Dosbox can get a little sloooooow, at times.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=857341
Not a real fix either, but nothing else to do, until the package gets updated, I guess!

cheers