<s>
The	O
UNIVAC	B-Device
490	I-Device
was	O
a	O
30-bit	O
word	O
magnetic-core	O
memory	O
machine	O
with	O
16K	O
or	O
32K	O
words	O
;	O
4.8	O
microsecond	O
cycle	O
time	O
made	O
by	O
UNIVAC	O
.	O
</s>
<s>
That	O
system	O
was	O
the	O
heart	O
of	O
the	O
Naval	B-Device
Tactical	I-Device
Data	I-Device
System	I-Device
which	O
pioneered	O
the	O
use	O
of	O
shipboard	O
computers	O
for	O
air	O
defense	O
.	O
</s>
<s>
The	O
military	O
version	O
went	O
by	O
a	O
variety	O
of	O
names	O
:	O
UNIVAC	B-Device
1232	I-Device
,	O
AN/USQ	B-Device
-20	I-Device
,	O
MIL-1206	O
and	O
CP642	O
.	O
</s>
<s>
CONTORTS	O
was	O
the	O
origin	O
of	O
Univac	O
's	O
subsequent	O
RT	O
operating	O
systems	O
for	O
494	O
(	O
STARS	O
)	O
and	O
later	O
converted	O
to	O
the	O
1100	B-Device
Series	I-Device
(	O
RTOS	O
)	O
.	O
</s>
<s>
The	O
machine	O
provided	O
the	O
programmer	O
with	O
the	O
following	O
registers	B-General_Concept
:	O
</s>
