<s>
The	O
Experimental	O
Semi-Automatic	B-Device
Ground	I-Device
Environment	I-Device
(	O
SAGE	O
)	O
Sector	O
(	O
ESS	O
,	O
Experimental	B-Device
SAGE	I-Device
Subsector	I-Device
until	O
planned	O
Sectors/Subsectors	O
were	O
renamed	O
NORAD	O
Regions	O
,	O
Divisions	O
,	O
and	O
Sectors	O
)	O
was	O
a	O
prototype	O
Cold	B-Application
War	I-Application
Air	O
Defense	O
Sector	O
for	O
developing	O
the	O
Semi	B-Device
Automatic	I-Device
Ground	I-Device
Environment	I-Device
.	O
</s>
<s>
The	O
network	O
's	O
Direction	O
Center	O
was	O
completed	O
in	O
a	O
new	O
1954	O
building	O
(	O
Building	O
F	O
,	O
)	O
with	O
prototype	O
peripherals	O
and	O
a	O
single	O
IBM	O
XD-1	O
computer	O
,	O
a	O
successor	O
to	O
Lincoln	O
Lab	O
's	O
Whirlwind	B-Device
I	I-Device
computer	O
(	O
WWI	O
)	O
.	O
</s>
<s>
Initial	O
service	O
test	O
models	O
of	O
the	O
Burroughs	B-Device
AN/FST	I-Device
-2	I-Device
Coordinate	I-Device
Data	I-Device
Transmitting	I-Device
Set	I-Device
were	O
placed	O
with	O
radars	O
at	O
South	O
Truro	O
and	O
West	O
Bath	O
,	O
Maine	O
;	O
followed	O
by	O
Texas	O
Tower	O
#2	O
(	O
TT2	O
)	O
in	O
the	O
Atlantic	O
Ocean	O
,	O
which	O
provided	O
a	O
"	O
triangular	O
pattern	O
with	O
overlap	O
"	O
radar	O
coverage	O
(	O
TT2	O
later	O
had	O
a	O
connection	O
from	O
the	O
XD-1	O
via	O
the	O
GE	O
G/A	O
Data	O
Link	O
Output	O
Subsystem	O
through	O
North	O
Truro	O
Air	O
Force	O
Station	O
.	O
)	O
</s>
<s>
WWI	O
was	O
connected	O
to	O
the	O
Experimental	B-Device
SAGE	I-Device
Subsector	I-Device
to	O
verify	O
crosstelling	O
(	O
collateral	O
communication	O
)	O
with	O
the	O
ESS	O
DC	O
,	O
and	O
WWI	O
was	O
also	O
used	O
for	O
a	O
Ground-to-Air	O
(	O
G/A	O
)	O
experiment	O
using	O
a	O
transmitter	O
of	O
the	O
GE	O
G/A	O
Data	O
Link	O
Output	O
Subsystem	O
on	O
Prospect	O
Hill	O
,	O
Waltham	O
,	O
MA	O
sending	O
data	O
to	O
simulated	O
airborne	O
equipment	O
at	O
Lexington	O
.	O
</s>
<s>
Transmissions	O
from	O
the	O
WWI	B-Device
SAGE	I-Device
Evaluation	I-Device
(	O
WISE	O
)	O
computer	O
system	O
to	O
XD-1	O
and	O
back	O
were	O
without	O
error	O
by	O
December	O
1955	O
when	O
operational	O
software	O
specifications	O
were	O
frozen	O
.	O
</s>
<s>
By	O
December	O
31	O
,	O
1958	O
,	O
ADC	O
Manual	O
55-28	O
described	O
the	O
Model	O
3	O
SAGE	B-Device
System	I-Device
.	O
</s>
<s>
"	O
To	O
prove	O
out	O
the	O
revised	O
SAGE	B-Device
computer	I-Device
program	O
"	O
for	O
Automatic	O
Targeting	O
and	O
Battery	O
Evaluation	O
and	O
ADDC-AADCP	O
crosstelling	O
,	O
a	O
"	O
SAGE/Missile	O
Master	O
"	O
test	O
was	O
conducted	O
beginning	O
in	O
September	O
1959	O
with	O
communications	O
between	O
the	O
ESS	O
XD-1	O
and	O
Martin	O
AN/FSG	O
-1	O
Antiaircraft	O
Defense	O
System	O
equipment	O
at	O
Fort	O
Banks	O
planned	O
for	O
the	O
CONAD	O
Joint	O
Control	O
Center	O
at	O
Fort	O
Heath	O
—	O
a	O
"	O
SAGE	O
ATABE	O
Simulation	O
Study	O
"	O
(	O
SASS	O
)	O
was	O
also	O
completed	O
1959-60	O
by	O
MITRE	O
Corporation	O
.	O
</s>
