On May 20, 2014, at 1:48 PM, Jean-Yves Bernier <bernier at pescadoo.net> wrote: ... Virtualization had the side effect to move simh from Mac OS X to Linux, and things are much more simpler and up-to-date (Apple don't care BSD besides its own needs). I guess that s true, but it doesn t seem to cause trouble. I do a lot of my personal Unix development on Mac OS with few issues, other than having to put up with Clang. For example, SIMH works just fine. paul