<s>
Special	B-Application
Real	I-Application
Time	I-Application
Operating	I-Application
System	I-Application
(	O
SRTOS	B-Application
)	O
is	O
a	O
discontinued	O
IBM	O
real	B-Operating_System
time	I-Operating_System
operating	I-Operating_System
system	I-Operating_System
,	O
originally	O
designed	O
for	O
use	O
in	O
the	O
electricity	O
industry	O
,	O
but	O
later	O
also	O
applied	O
in	O
other	O
areas	O
of	O
industrial	O
process	O
control	O
.	O
</s>
<s>
Rather	O
than	O
a	O
standalone	O
operating	O
system	O
,	O
it	O
was	O
designed	O
as	O
an	O
extension	O
to	O
the	O
OS/VS1	B-Application
and	O
OS/VS2	B-Application
(	O
later	O
MVS	B-Application
)	O
operating	O
systems	O
.	O
</s>
<s>
SRTOS	B-Application
was	O
originally	O
released	O
in	O
1976	O
,	O
and	O
though	O
no	O
longer	O
supported	O
as	O
a	O
program	O
product	O
,	O
it	O
is	O
currently	O
used	O
as	O
part	O
of	O
several	O
ACS	O
and	O
RPMS	O
installations	O
worldwide	O
.	O
</s>
