<s>
Basic	O
Operating	O
System/360	O
(	O
BOS/360	B-Application
)	O
was	O
an	O
early	O
IBM	B-Application
System/360	I-Application
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
BOS	O
was	O
one	O
of	O
four	O
System/360	B-Application
Operating	B-General_Concept
System	I-General_Concept
versions	O
developed	O
by	O
the	O
IBM	O
General	O
Products	O
Division	O
(	O
GPD	O
)	O
in	O
Endicott	O
,	O
New	O
York	O
to	O
fill	O
a	O
gap	O
at	O
the	O
low	O
end	O
of	O
the	O
System/360	B-Application
line	O
when	O
it	O
became	O
apparent	O
that	O
OS/360	O
was	O
not	O
able	O
to	O
run	O
on	O
the	O
smallest	O
systems	O
.	O
</s>
<s>
BOS	O
was	O
intended	O
for	O
disk	O
systems	O
with	O
at	O
least	O
8KB	O
and	O
one	O
2311	B-Device
disk	O
drive	O
.	O
</s>
<s>
DOS	B-Application
and	I-Application
TOS	I-Application
were	O
developed	O
from	O
BOS	O
for	O
systems	O
with	O
at	O
least	O
16KB	O
and	O
either	O
disks	O
(	O
DOS	O
)	O
or	O
tape	O
drives	O
only	O
(	O
TOS	O
)	O
.	O
</s>
<s>
BOS	O
was	O
released	O
in	O
October	O
1965	O
,	O
nearly	O
two	O
years	O
before	O
OS/360	O
,	O
thus	O
BOS	O
was	O
the	O
only	O
disk	O
based	O
operating	B-General_Concept
system	I-General_Concept
available	O
at	O
launch	O
for	O
a	O
machine	O
that	O
was	O
marketed	O
as	O
disk	O
based	O
.	O
</s>
<s>
The	O
supervisor	B-Operating_System
.	O
</s>
<s>
Job	B-Application
control	I-Application
capable	O
of	O
running	O
jobs	O
sequentially	O
from	O
the	O
card	O
reader	O
.	O
</s>
<s>
The	O
"	O
Load	O
System	O
Program	O
,	O
"	O
a	O
sysgen	B-Application
program	O
to	O
build	O
a	O
disk-resident	O
BOS	O
system	O
from	O
cards	O
.	O
</s>
<s>
Language	O
translators	O
,	O
an	O
Assembler	O
and	O
an	O
RPG	B-Language
compiler	O
.	O
</s>
<s>
Compilers	O
for	O
FORTRAN	O
IV	O
and	O
COBOL	B-Application
were	O
added	O
later	O
.	O
</s>
<s>
Remote	B-Protocol
Job	I-Protocol
Entry	I-Protocol
allowing	O
the	O
BOS	O
system	O
to	O
submit	O
jobs	O
to	O
a	O
remote	O
System/360	B-Application
and	O
receive	O
output	O
.	O
</s>
<s>
Data	O
Management	O
,	O
consisting	O
of	O
supervisor	B-Operating_System
support	O
for	O
Physical	O
IOCS	B-Application
,	O
and	O
macros	O
for	O
Logical	O
IOCS	B-Application
which	O
could	O
be	O
incorporated	O
into	O
the	O
user	O
's	O
processing	O
programs	O
.	O
</s>
<s>
The	O
IBM	B-Device
1070	I-Device
Process	O
Communication	O
Supervisor	B-Operating_System
was	O
a	O
dedicated	O
process	O
control	O
system	O
that	O
ran	O
as	O
an	O
extension	O
under	O
BOS	O
"	O
Relying	O
on	O
the	O
BOS	O
supervisor	B-Operating_System
to	O
handle	O
ordinary	O
physical	O
and	O
logical	O
I/O	O
operations	O
(	O
i	O
.	O
e.	O
,	O
for	O
cards	O
,	O
disk	O
,	O
etc	O
.	O
</s>
<s>
)	O
,	O
the	O
PC	O
supervisor	B-Operating_System
is	O
specialized	O
to	O
the	O
process	O
control	O
aspects	O
of	O
the	O
user	O
's	O
program.	O
"	O
</s>
