Porting from IRIX to Linux   Linux is a superset of the POSIX
(Portable Operating System Interface for X) specification. It
runs on commodity PC hardware, MIPS systems, Suns, Macintoshes
and even IBM mainframes. It's sufficiently UNIX-like that much
UNIX code can be ported over with little change.  The Advanced
Concepts Research Tool (ACRT) is a descendant of the ARPA
Reconfigurable Simulator Initiative (ARSI). It's primarily IRIX
but has NT versions for many of its modules. ACRT is a vehicle
simulator that can be reconfigured into different vehicles.
Raytheon supplies the land vehicle simulators, which currently
are the M1A1 and M1A2 tanks, M2 armored personnel carrier, M113,
M577, HMMWV and the Future Scout. Reconfigurability is done by
using “Erector Set”® type hardware, soft panels for controls,
serial line inputs for grips and a common set of core software.
The Erector Set hardware looks like a scaled-up version of its
namesake. This allows the crew seats, controls and monitors that
can be placed in a v