This is HAL targetted for the Interdata 70 mini.  The code
cross-compiled on the PDP9/15 systems and wrote images to
the filestore which were then executed on the Interdatas, which
had no local storage.

We do have a working version of the 9/15 Imp compiler plus an
emulator, so we should be able to compile and run this HAL assembler.

Unfortunately at the moment, we do not have any HAL code to feed
through it, but if we ever do recover the sources of systems such
as the Filestore, Legos, Isys, et al, we ought to be able to run
them under emulation.  I believe simh does support this processor.