I've installed Devuan_jessie_1.0.0-beta_amd64_CD.iso from USB stick onto
an older MacBook Pro and it installs.

One question I have is that it seems to install the base system from the
net rather than taking the base packages from the ISO image. Later,
"select and install software" downloads from the net, too, but
that is expected to a certain extent unlike for the base system. I was
kind of hoping that the base installation would use the ISO image, is
there a way to set it to use what's in the ISO image before going out to
the net?

Other than that, it runs as normal. And it has SysV and no systemd! Thanks!

Regards,
Lars