<s>
Industrial	B-Language
Real-Time	I-Language
Fortran	I-Language
(	O
IRTF	O
)	O
was	O
developed	O
,	O
during	O
the	O
decade	O
of	O
1970-1980	O
,	O
to	O
augment	O
the	O
Fortran	B-Application
language	I-Application
with	O
library	O
bindings	O
useful	O
for	O
process	O
and	O
device	O
control	O
,	O
and	O
I/O	O
.	O
</s>
<s>
Also	O
included	O
in	O
IRTF	O
was	O
a	O
set	O
of	O
bit-manipulation	O
functions	O
which	O
were	O
eventually	O
incorporated	O
into	O
MIL_STD-1753	O
for	O
Fortran-77	O
,	O
and	O
later	O
into	O
Fortran-90	O
.	O
</s>
<s>
The	O
Fortran	B-Application
committee	O
created	O
a	O
proposal	O
which	O
was	O
approved	O
and	O
published	O
by	O
the	O
Instrument	O
Society	O
of	O
America	O
(	O
ISA	O
)	O
as	O
ISA	O
Standard	O
S61.1	O
(	O
1972	O
)	O
.	O
</s>
<s>
Additional	O
work	O
,	O
including	O
work	O
on	O
management	O
of	O
parallel	O
tasks	O
,	O
was	O
performed	O
both	O
in	O
the	O
U.S.	O
as	O
S61.3	O
,	O
and	O
in	O
Germany	O
as	O
Prozess-FORTRAN	O
.	O
</s>
<s>
While	O
IRTF	O
held	O
some	O
influence	O
in	O
certain	O
markets	O
in	O
the	O
1970s	O
,	O
by	O
the	O
early	O
1980s	O
most	O
process	O
control	O
systems	O
were	O
being	O
built	O
using	O
microprocessor-based	O
systems	O
where	O
Fortran	B-Application
was	O
not	O
available	O
.	O
</s>
<s>
Modern	O
systems	O
tend	O
to	O
use	O
POSIX	B-Operating_System
Threads	I-Operating_System
instead	O
.	O
</s>
