<s>
IBSYS	B-Operating_System
is	O
the	O
discontinued	O
tape-based	O
operating	B-General_Concept
system	I-General_Concept
that	O
IBM	O
supplied	O
with	O
its	O
IBM	B-Device
709	I-Device
,	O
IBM	B-Device
7090	I-Device
and	O
IBM	B-Device
7094	I-Device
computers	O
.	O
</s>
<s>
A	O
similar	O
operating	B-General_Concept
system	I-General_Concept
(	O
but	O
with	O
several	O
significant	O
differences	O
)	O
,	O
also	O
called	O
IBSYS	B-Operating_System
,	O
was	O
provided	O
with	O
IBM	B-Device
7040	I-Device
and	O
IBM	B-Device
7044	I-Device
computers	O
.	O
</s>
<s>
IBSYS	B-Operating_System
was	O
based	O
on	O
FORTRAN	O
Monitor	O
System	O
(	O
FMS	O
)	O
and	O
(	O
more	O
likely	O
)	O
Bell	O
Labs	O
 '	O
"	O
BESYS	B-Operating_System
"	O
rather	O
than	O
the	O
SHARE	B-Application
Operating	I-Application
System	I-Application
.	O
</s>
<s>
IBSYS	B-Operating_System
directly	O
supported	O
several	O
old	O
language	O
processors	O
on	O
the	O
$EXECUTE	O
card	B-Architecture
:	O
9PAC	B-Application
,	O
FORTRAN	O
and	O
IBSFAP	O
.	O
</s>
<s>
Newer	O
language	O
processors	O
ran	O
under	O
IBJOB	B-Operating_System
.	O
</s>
<s>
IBM	O
later	O
provided	O
similar	O
facilities	O
for	O
the	O
7040/7044	B-Device
as	O
IBM	O
7040/7044	B-Device
Operating	B-General_Concept
System	I-General_Concept
(	O
16K/32K	O
)	O
7040-PR-150	O
and	O
for	O
the	O
IBM	O
1410/IBM	O
7010	O
as	O
IBM	O
1410/7010	O
Operating	B-General_Concept
System	I-General_Concept
1410-PR-155	O
.	O
</s>
<s>
IBSYS	B-Operating_System
itself	O
is	O
a	O
resident	B-Application
monitor	I-Application
program	O
,	O
that	O
reads	O
control	O
card	B-Architecture
images	O
placed	O
between	O
the	O
decks	O
of	O
program	O
and	O
data	O
cards	O
of	O
individual	O
jobs	O
.	O
</s>
<s>
An	O
IBSYS	B-Operating_System
control	O
card	B-Architecture
begins	O
with	O
a	O
"	O
$	O
"	O
in	O
column	O
1	O
,	O
immediately	O
followed	O
by	O
a	O
Control	O
Name	O
that	O
selects	O
the	O
various	O
IBSYS	B-Operating_System
utility	O
programs	O
needed	O
to	O
set	O
up	O
and	O
run	O
the	O
job	O
.	O
</s>
<s>
These	O
card	B-Architecture
deck	I-Architecture
images	O
are	O
usually	O
read	O
from	O
magnetic	O
tapes	O
prepared	O
offline	O
,	O
not	O
directly	O
from	O
the	O
card	B-Architecture
reader	O
.	O
</s>
<s>
The	O
IBJOB	B-Operating_System
Processor	O
is	O
a	O
subsystem	O
that	O
runs	O
under	O
the	O
IBSYS	B-Operating_System
System	O
Supervisor	O
.	O
</s>
<s>
The	O
languages	O
supported	O
include	O
COBOL	B-Application
.	O
</s>
<s>
Commercial	B-Language
Translator	I-Language
(	O
COMTRAN	B-Language
)	O
,	O
Fortran	O
IV	O
(	O
IBFTC	O
)	O
and	O
Macro	O
Assembly	O
Program	O
(	O
IBMAP	O
)	O
.	O
</s>
