<s>
NCOS	B-Operating_System
is	O
the	O
graphical	O
user	O
interface-based	O
operating	B-General_Concept
system	I-General_Concept
developed	O
for	O
use	O
in	O
Oracle	B-Application
Corporation	I-Application
's	O
Network	B-Operating_System
Computers	I-Operating_System
,	O
which	O
are	O
discontinued	O
.	O
</s>
<s>
It	O
was	O
adapted	O
by	O
Acorn	O
Computers	O
from	O
its	O
own	O
,	O
which	O
was	O
originally	O
developed	O
for	O
their	O
range	O
of	O
Archimedes	B-Device
desktop	O
computers	O
.	O
</s>
<s>
It	O
shares	O
with	O
the	O
same	O
4MB	O
ROM	B-Device
size	O
and	O
suitability	O
for	O
use	O
with	O
TV	O
displays	O
.	O
</s>
<s>
This	O
gave	O
Pace	O
the	O
rights	O
to	O
use	O
and	O
develop	O
NCOS	B-Operating_System
.	O
</s>
<s>
RISCOS	B-Operating_System
Ltd	O
later	O
announced	O
Embedded	O
RISC	B-Operating_System
OS	I-Operating_System
,	O
which	O
was	O
to	O
have	O
similarities	O
with	O
NCOS	B-Operating_System
.	O
</s>
<s>
NCOS	B-Operating_System
originated	O
in	O
connection	O
with	O
the	O
Network	B-Operating_System
Computer	I-Operating_System
project	O
.	O
</s>
<s>
It	O
branched	O
from	O
RISC	B-Operating_System
OS	I-Operating_System
3.60	O
and	O
was	O
called	O
RISC	B-Operating_System
OS	I-Operating_System
3.61	O
before	O
being	O
named	O
after	O
Network	B-Operating_System
Computer	I-Operating_System
Operating	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
NCOS	B-Operating_System
was	O
designed	O
in	O
accord	O
with	O
the	O
Network	B-Device
Computer	I-Device
Reference	I-Device
Profile	I-Device
and	O
thus	O
supports	O
internet	O
standards	O
of	O
the	O
time	O
.	O
</s>
<s>
Being	O
closely	O
based	O
on	O
,	O
it	O
can	O
also	O
run	O
many	O
of	O
that	O
operating	B-General_Concept
system	I-General_Concept
's	O
applications	O
.	O
</s>
<s>
Reporting	O
on	O
the	O
launch	O
of	O
the	O
Network	B-Operating_System
Computer	I-Operating_System
in	O
1996	O
,	O
it	O
was	O
noted	O
that	O
NCOS	B-Operating_System
was	O
essentially	O
the	O
same	O
as	O
RISC	B-Operating_System
OS	I-Operating_System
but	O
with	O
some	O
features	O
removed	O
,	O
such	O
as	O
"	O
support	O
for	O
local	O
file	O
systems	O
"	O
,	O
whereas	O
other	O
features	O
such	O
as	O
network	O
support	O
had	O
been	O
added	O
to	O
ROM	B-Device
.	O
</s>
<s>
The	O
actual	O
differences	O
involved	O
the	O
absence	O
of	O
"	O
modules	O
significant	O
to	O
the	O
operation	O
and	O
networking	O
"	O
of	O
existing	O
RISC	B-Operating_System
OS	I-Operating_System
versions	O
,	O
including	O
the	O
Filer	O
,	O
TaskManager	O
and	O
Pinboard	O
modules	O
,	O
plus	O
a	O
range	O
of	O
networking	O
modules	O
.	O
</s>
<s>
The	O
use	O
of	O
files	O
stored	O
on	O
a	O
server	O
and	O
accessed	O
using	O
the	O
Network	O
File	O
System	O
(	O
NFS	O
)	O
also	O
imposed	O
restrictions	O
on	O
the	O
files	O
used	O
by	O
applications	O
,	O
with	O
recommended	O
techniques	O
for	O
the	O
deployment	O
of	O
applications	O
involving	O
the	O
transfer	O
of	O
files	O
over	O
NFS	O
from	O
RISC	B-Operating_System
OS	I-Operating_System
clients	O
or	O
the	O
use	O
of	O
archives	O
in	O
the	O
largely	O
Acorn-specific	O
Spark	O
format	O
,	O
with	O
these	O
being	O
unpacked	O
on	O
the	O
server	O
using	O
an	O
appropriate	O
tool	O
.	O
</s>
