<s>
BS2000	B-Application
is	O
an	O
operating	B-General_Concept
system	I-General_Concept
for	O
IBM	O
390-compatible	O
mainframe	B-Architecture
computers	I-Architecture
developed	O
in	O
the	O
1970s	O
by	O
Siemens	O
(	O
Data	O
Processing	O
Department	O
EDV	O
)	O
and	O
from	O
early	O
2000s	O
onward	O
by	O
Fujitsu	O
Technology	O
Solutions	O
.	O
</s>
<s>
Unlike	O
other	O
mainframe	B-Architecture
systems	O
,	O
BS2000	B-Application
provides	O
exactly	O
the	O
same	O
user	O
and	O
programming	O
interface	O
in	O
all	O
operating	O
modes	O
(	O
batch	O
,	O
interactive	O
and	O
online	B-General_Concept
transaction	I-General_Concept
processing	I-General_Concept
)	O
and	O
regardless	O
of	O
whether	O
it	O
is	O
running	O
natively	O
or	O
as	O
a	O
guest	O
system	O
in	O
a	O
virtual	B-Architecture
machine	I-Architecture
.	O
</s>
<s>
This	O
uniformity	O
of	O
the	O
user	O
interface	O
and	O
the	O
entire	O
BS2000	B-Application
software	O
configuration	O
makes	O
administration	O
and	O
automation	O
particularly	O
easy	O
.	O
</s>
<s>
BS2000	B-Application
has	O
its	O
roots	O
in	O
the	O
Time	B-Operating_System
Sharing	I-Operating_System
Operating	I-Operating_System
System	I-Operating_System
(	O
TSOS	B-Operating_System
)	O
first	O
developed	O
by	O
RCA	O
for	O
the	O
/46	O
model	O
of	O
the	O
Spectra/70	B-Device
series	O
,	O
a	O
computer	O
family	O
of	O
the	O
late	O
1960s	O
related	O
in	O
its	O
architecture	O
to	O
IBM	O
's	O
/360	B-Application
series	I-Application
.	O
</s>
<s>
It	O
was	O
an	O
early	O
operating	B-General_Concept
system	I-General_Concept
which	O
used	O
virtual	B-General_Concept
addressing	I-General_Concept
and	O
a	O
segregated	O
address	B-General_Concept
space	I-General_Concept
for	O
the	O
programs	O
of	O
different	O
users	O
.	O
</s>
<s>
From	O
the	O
outset	O
TSOS	B-Operating_System
also	O
allowed	O
data	O
peripherals	O
to	O
be	O
accessed	O
only	O
via	O
record	O
-	O
or	O
block-oriented	O
file	O
interfaces	O
,	O
thereby	O
preventing	O
the	O
necessity	O
to	O
implement	O
device	O
dependencies	O
in	O
user	O
programs	O
.	O
</s>
<s>
The	O
same	O
operating	B-General_Concept
system	I-General_Concept
was	O
also	O
sold	O
to	O
Sperry	O
Univac	O
when	O
it	O
bought	O
most	O
of	O
RCA	O
's	O
computer	O
division	O
.	O
</s>
<s>
Univac	O
's	O
"	O
fork	B-Application
"	O
of	O
TSOS	B-Operating_System
would	O
become	O
VS/9	O
,	O
which	O
used	O
many	O
of	O
the	O
same	O
concepts	O
.	O
</s>
<s>
In	O
June	O
1975	O
,	O
Siemens	O
shipped	O
the	O
enhanced	O
BS2000	B-Application
V2.0	O
version	O
of	O
the	O
TSOS	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
for	O
the	O
models	O
of	O
the	O
Siemens	O
7.700	O
mainframe	B-Architecture
series	O
for	O
the	O
first	O
time	O
under	O
the	O
name	O
BS2000	B-Application
.	O
</s>
<s>
This	O
first	O
version	O
supported	O
disk	B-Architecture
paging	I-Architecture
and	O
three	O
different	O
operating	O
modes	O
in	O
the	O
same	O
system	O
:	O
interactive	O
dialog	O
,	O
batch	O
,	O
and	O
transaction	O
mode	O
,	O
a	O
precursor	O
of	O
online	B-General_Concept
transaction	I-General_Concept
processing	I-General_Concept
.	O
</s>
<s>
In	O
1977	O
,	O
the	O
TRANSDATA	O
communication	O
system	O
used	O
computer	B-Architecture
networking	I-Architecture
.	O
</s>
<s>
In	O
1978	O
,	O
multiprocessor	B-Operating_System
technology	O
was	O
introduced	O
.	O
</s>
<s>
The	O
operating	B-General_Concept
system	I-General_Concept
had	O
the	O
ability	O
to	O
cope	O
with	O
a	O
processor	O
failure	O
.	O
</s>
<s>
In	O
1979	O
,	O
a	O
transaction	B-General_Concept
processing	I-General_Concept
monitor	I-General_Concept
,	O
the	O
Universal	O
Transaction	O
Monitor	O
(	O
UTM	O
)	O
,	O
was	O
introduced	O
,	O
providing	O
support	O
for	O
online	B-General_Concept
transaction	I-General_Concept
processing	I-General_Concept
as	O
an	O
additional	O
operating	O
mode	O
.	O
</s>
<s>
In	O
1987	O
,	O
BS2000	B-Application
V9.0	O
was	O
ported	O
to	O
the	O
/370	B-Device
architecture	I-Device
supported	O
2GB	O
address	B-General_Concept
spaces	I-General_Concept
,	O
512	O
processes	B-Operating_System
and	O
the	O
XS	O
channel	O
system	O
(	O
Dynamic	O
Channel	O
Subsystem	O
)	O
.	O
</s>
<s>
BS2000	B-Application
was	O
subdivided	O
into	O
subsystems	O
decoupled	O
from	O
one	O
another	O
.	O
</s>
<s>
With	O
the	O
advent	O
of	O
the	O
VM2000	O
virtual	B-Architecture
machine	I-Architecture
in	O
1990	O
,	O
multiple	O
BS2000	B-Application
systems	O
,	O
of	O
the	O
same	O
or	O
different	O
versions	O
,	O
can	O
run	O
in	O
parallel	O
on	O
the	O
same	O
computer	O
.	O
</s>
<s>
From	O
1992	O
through	O
1995	O
,	O
BS2000/OSD	B-Application
V1.0	O
was	O
made	O
open	O
to	O
application	O
software	O
and	O
was	O
renamed	O
BS2000/OSD	B-Application
(	O
Open	O
Server	O
Dimension	O
)	O
.	O
</s>
<s>
In	O
1996	O
,	O
BS2000/OSD	B-Application
was	O
ported	O
to	O
the	O
MIPS	B-Device
architecture	I-Device
.	O
</s>
<s>
Although	O
the	O
operating	B-General_Concept
system	I-General_Concept
ran	O
on	O
different	O
hardware	O
architectures	O
(	O
S	O
servers	O
with	O
/390	B-Device
architecture	O
and	O
SR2000	O
servers	O
for	O
the	O
MIPS	B-Device
architecture	I-Device
)	O
,	O
applications	O
produced	O
for	O
/390	B-Device
can	O
be	O
used	O
on	O
computers	O
based	O
on	O
MIPS	B-Device
architecture	I-Device
without	O
recompilation	O
due	O
an	O
emulation	O
layer	O
for	O
legacy	O
code	O
.	O
</s>
<s>
In	O
1999	O
,	O
BS2000/OSD	B-Application
was	O
the	O
first	O
operating	B-General_Concept
system	I-General_Concept
to	O
be	O
awarded	O
Internet	O
Branding	O
by	O
The	B-Application
Open	I-Application
Group	I-Application
.	O
</s>
<s>
In	O
2002	O
,	O
BS2000/OSD	B-Application
was	O
ported	O
to	O
the	O
SPARC	B-Architecture
architecture	O
,	O
leading	O
to	O
the	O
Fujitsu	O
Siemens	O
Computers	O
 '	O
SX	O
server	O
line	O
.	O
</s>
<s>
In	O
2004	O
,	O
support	O
for	O
storage	O
area	O
networks	O
based	O
on	O
Fibre	B-Architecture
Channel	I-Architecture
technology	O
was	O
introduced	O
.	O
</s>
<s>
In	O
2006	O
,	O
BS2000/OSD	B-Application
V7.0	O
introduced	O
support	O
for	O
new	O
server	O
generations	O
,	O
Unicode	O
support	O
,	O
and	O
improved	O
SAN	O
integration	O
.	O
</s>
<s>
In	O
2008	O
,	O
BS2000/OSD	B-Application
was	O
ported	O
to	O
the	O
x86	B-Operating_System
architecture	I-Operating_System
,	O
and	O
the	O
SQ	O
server	O
line	O
was	O
introduced	O
.	O
</s>
<s>
In	O
2012	O
,	O
BS2000/OSD	B-Application
version	O
9.0	O
was	O
released	O
.	O
</s>
