<s>
The	O
HITAC	B-Device
S-3000	I-Device
is	O
a	O
former	O
family	O
of	O
vector	B-Operating_System
supercomputers	B-Architecture
,	O
which	O
was	O
developed	O
,	O
manufactured	O
and	O
marketed	O
by	O
Hitachi	O
.	O
</s>
<s>
Announced	O
in	O
April	O
1992	O
,	O
the	O
family	O
succeeded	O
the	O
HITAC	B-Device
S-820	I-Device
.	O
</s>
<s>
Unlike	O
Hitachi	O
's	O
previous	O
generations	O
of	O
supercomputers	B-Architecture
,	O
the	O
S-3000	O
family	O
was	O
marketed	O
outside	O
Japan	O
.	O
</s>
<s>
It	O
was	O
a	O
parallel	O
vector	B-Operating_System
processor	I-Operating_System
and	O
supported	O
one	O
to	O
four	O
vector	B-Operating_System
processors	I-Operating_System
.	O
</s>
<s>
In	O
1994	O
,	O
the	O
S-3000	O
family	O
was	O
complemented	O
by	O
an	O
MPP	O
machine	O
that	O
used	O
superscalar	B-General_Concept
microprocessors	O
,	O
the	O
SR2001	O
.	O
</s>
<s>
Hitachi	O
eventually	O
discontinued	O
development	O
of	O
vector	B-Operating_System
supercomputers	B-Architecture
in	O
favor	O
of	O
this	O
approach	O
.	O
</s>
<s>
The	O
S-3000	O
family	O
was	O
replaced	O
in	O
2000	O
by	O
the	O
SR8000	O
,	O
making	O
it	O
the	O
last	O
vector	B-Operating_System
supercomputer	B-Architecture
from	O
Hitachi	O
.	O
</s>
<s>
The	O
CPU	O
architecture	O
of	O
HITACHI	O
S-3800	O
Series	O
was	O
based	O
on	O
IBM	B-Device
System/370	I-Device
,	O
and	O
compatible	O
with	O
Hitachi	O
's	O
mainframe	O
systems	O
.	O
</s>
<s>
It	O
supported	O
two	O
operating	O
systems	O
:	O
OSF/1	B-Operating_System
Unix	I-Operating_System
and	O
Hitachi	O
's	O
own	O
VOS3	O
(	O
a	O
fork	O
of	O
IBM	B-Application
MVS	I-Application
)	O
.	O
</s>
