<s>
Commercial	B-Operating_System
Operating	I-Operating_System
System	I-Operating_System
(	O
COS	O
)	O
is	O
a	O
discontinued	O
family	O
of	O
operating	B-General_Concept
systems	I-General_Concept
from	O
Digital	O
Equipment	O
Corporation	O
.	O
</s>
<s>
They	O
supported	O
the	O
use	O
of	O
DIBOL	B-Language
,	O
a	O
programming	O
language	O
combining	O
features	O
of	O
BASIC	O
,	O
FORTRAN	B-Application
and	O
COBOL	B-Application
.	O
</s>
<s>
COS	O
also	O
supported	O
IBM	B-Language
RPG	I-Language
(	O
Report	B-Language
Program	I-Language
Generator	I-Language
)	O
.	O
</s>
<s>
The	O
Commercial	B-Operating_System
Operating	I-Operating_System
System	I-Operating_System
was	O
implemented	O
to	O
run	O
on	O
hardware	O
from	O
the	O
PDP-8	B-Device
and	O
PDP-11	B-Device
families	O
.	O
</s>
<s>
COS-310	O
was	O
developed	O
for	O
the	O
PDP-8	B-Device
to	O
provide	O
an	O
operating	O
environment	O
for	O
DIBOL	B-Language
.	O
</s>
<s>
A	O
COS-310	O
system	O
was	O
purchased	O
as	O
a	O
package	O
which	O
included	O
a	O
desk	O
,	O
VT52	B-Application
VDT	O
(	O
Video	O
Display	O
Tube	O
)	O
,	O
and	O
a	O
pair	O
of	O
eight	O
inch	O
floppy	O
drives	O
.	O
</s>
<s>
COS-310	O
was	O
one	O
of	O
the	O
operating	B-General_Concept
systems	I-General_Concept
available	O
on	O
the	O
DECmate	O
II	O
.	O
</s>
<s>
COS-350	O
was	O
developed	O
to	O
support	O
the	O
PDP-11	B-Device
port	O
of	O
DIBOL	B-Language
,	O
and	O
was	O
the	O
focus	O
for	O
some	O
vendors	O
of	O
turnkey	O
software	O
packages	O
.	O
</s>
<s>
The	O
much	O
more	O
powerful	O
PDP-11/34	O
"	O
added	O
significant	O
configuration	O
flexibility	O
and	O
expansion	O
capability.	O
"	O
</s>
