<s>
SimOS	B-Application
was	O
a	O
full	B-Application
system	I-Application
simulator	I-Application
,	O
developed	O
in	O
the	O
Stanford	O
University	O
in	O
the	O
late	O
nineties	O
in	O
the	O
research	O
group	O
of	O
Mendel	O
Rosenblum	O
.	O
</s>
<s>
It	O
was	O
enabled	O
to	O
run	O
IRIX	B-Operating_System
5.3	O
on	O
MIPS	B-Device
,	O
and	O
Unix	O
variants	O
on	O
Alpha	O
.	O
</s>
<s>
SimOS-PPC	O
was	O
forked	O
from	O
the	O
original	O
SimOS	B-Application
as	O
IBM	O
's	O
internal	O
project	O
,	O
running	O
a	O
modified	O
AIX	B-Application
kernel	O
and	O
userland	O
in	O
an	O
emulator	O
,	O
developed	O
by	O
Tom	O
Keller	O
and	O
his	O
team	O
in	O
the	O
Austin	O
lab	O
of	O
IBM	O
.	O
</s>
<s>
IBM	O
used	O
SimOS	B-Application
to	O
facilitate	O
development	O
of	O
new	O
systems	O
.	O
</s>
<s>
The	O
software	O
used	O
in	O
this	O
project	O
is	O
now	O
publicly	O
available	O
for	O
download	O
for	O
AIX	B-Application
4.3	O
licensees	O
.	O
</s>
<s>
Linux/SimOS	O
was	O
"	O
a	O
...	O
Linux	O
operating	O
system	O
port	O
to	O
SimOS	B-Application
,	O
which	O
is	O
a	O
complete	O
machine	O
simulator	O
from	O
Stanford	O
.	O
</s>
<s>
The	O
motivation	O
for	O
Linux/SimOS	O
is	O
to	O
alleviate	O
the	O
limitations	O
of	O
SimOS	B-Application
,	O
which	O
only	O
supports	O
proprietary	O
operating	O
systems.	O
"	O
</s>
<s>
SimBCM	O
is	O
an	O
open	O
source	O
full	B-Application
system	I-Application
simulator	I-Application
based	O
on	O
SimOS	B-Application
.	O
</s>
<s>
The	O
currently	O
available	O
commercial	O
product	O
,	O
Virtutech	O
Simics	B-Application
was	O
derived	O
from	O
the	O
work	O
of	O
the	O
Swedish	O
Institute	O
of	O
Computer	O
Science	O
,	O
and	O
was	O
originally	O
developed	O
to	O
run	O
a	O
full	B-Application
system	I-Application
simulation	I-Application
of	O
Solaris	O
on	O
SPARC	B-Architecture
platform	O
.	O
</s>
<s>
Simics	B-Application
was	O
used	O
by	O
IBM	O
to	O
help	O
develop	O
AIX	B-Application
6.1	O
on	O
a	O
simulation	O
of	O
the	O
POWER6	B-Device
hardware	O
.	O
</s>
<s>
RSIM	O
was	O
the	O
"	O
Rice	O
Simulator	O
for	O
ILP	B-Operating_System
Multiprocessors	O
"	O
,	O
developed	O
at	O
the	O
Rice	O
University	O
in	O
the	O
late	O
1990s	O
.	O
</s>
<s>
It	O
was	O
able	O
to	O
run	O
on	O
Solaris	O
,	O
IRIX	B-Operating_System
and	O
HP-UX	O
.	O
</s>
<s>
The	O
simulator	O
is	O
available	O
under	O
the	O
University	B-License
of	I-License
Illinois/NCSA	I-License
Open	I-License
Source	I-License
License	I-License
agreement	O
.	O
</s>
<s>
Developed	O
at	O
the	O
University	O
of	O
Michigan	O
,	O
M5	O
simulates	O
Alpha	O
and	O
SPARC	B-Architecture
hardware	O
,	O
with	O
support	O
for	O
other	O
architectures	O
in	O
progress	O
.	O
</s>
