<s>
UTS	B-Operating_System
is	O
a	O
discontinued	O
implementation	O
of	O
the	O
UNIX	B-Application
operating	I-Application
system	I-Application
for	O
IBM	B-Device
mainframe	I-Device
(	O
and	O
compatible	O
)	O
computers	O
.	O
</s>
<s>
Amdahl	O
created	O
the	O
first	O
versions	O
of	O
UTS	B-Operating_System
,	O
and	O
released	O
it	O
in	O
May	O
1981	O
,	O
with	O
UTS	B-Operating_System
Global	O
acquiring	O
rights	O
to	O
the	O
product	O
in	O
2002	O
.	O
</s>
<s>
UTS	B-Operating_System
Global	O
has	O
since	O
gone	O
out	O
of	O
business	O
.	O
</s>
<s>
UTS	B-Operating_System
Release	O
4.5	O
supports	O
the	O
following	O
S/390	B-Device
model	O
processors	O
and	O
their	O
successors	O
:	O
</s>
<s>
The	O
UTS	B-Operating_System
project	O
had	O
its	O
origins	O
in	O
work	O
started	O
at	O
Princeton	O
University	O
in	O
1975	O
to	O
port	O
UNIX	B-Application
to	O
the	O
IBM	O
VM/370	B-Application
system	O
.	O
</s>
<s>
Tom	O
Lyon	O
joined	O
Amdahl	O
in	O
1978	O
,	O
and	O
by	O
1979	O
there	O
was	O
a	O
full	O
Version	B-Operating_System
6	I-Operating_System
Unix	I-Operating_System
system	O
on	O
the	O
Amdahl	O
470	O
being	O
used	O
internally	O
for	O
design	O
automation	O
engineering	O
.	O
</s>
<s>
In	O
late	O
1979	O
this	O
was	O
updated	O
to	O
the	O
more	O
commonly	O
ported	O
Version	B-Operating_System
7	I-Operating_System
.	O
</s>
<s>
In	O
1980	O
Amdahl	O
announced	O
support	O
for	O
Unix	B-Application
on	O
the	O
System	O
470	O
.	O
</s>
<s>
Five	O
years	O
later	O
,	O
IBM	O
announced	O
its	O
own	O
mainframe	O
Unix	B-Application
,	O
IX/370	O
,	O
as	O
a	O
competitive	O
response	O
to	O
Amdahl	O
.	O
</s>
<s>
The	O
commercial	O
versions	O
of	O
UTS	B-Operating_System
were	O
based	O
on	O
UNIX	B-Operating_System
System	I-Operating_System
III	I-Operating_System
and	O
UNIX	B-Operating_System
System	I-Operating_System
V	I-Operating_System
.	O
In	O
1986	O
,	O
Amdahl	O
announced	O
the	O
first	O
version	O
to	O
run	O
natively	O
on	O
IBM/370	O
-compatible	O
hardware	O
,	O
UTS/580	O
for	O
its	O
Amdahl	O
580	O
series	O
of	O
machines	O
;	O
previous	O
Unix	B-Application
ports	O
always	O
ran	O
as	O
"	O
guests	O
"	O
under	O
the	O
IBM	O
VM	B-Application
hypervisor	B-Operating_System
.	O
</s>
<s>
Version	O
4.5	O
was	O
based	O
on	O
Unix	B-Operating_System
System	I-Operating_System
V	I-Operating_System
,	O
Release	O
4	O
(	O
SVR4	B-Operating_System
)	O
.	O
</s>
