<s>
The	O
Advanced	B-Device
Technology	I-Device
Airborne	I-Device
Computer	I-Device
(	O
ATAC	O
)	O
was	O
a	O
product	O
of	O
Itek	O
(	O
a	O
division	O
of	O
Litton	O
Industries	O
)	O
,	O
used	O
on	O
US	O
naval	O
aircraft	O
,	O
and	O
the	O
NASA	O
Galileo	O
(	O
spacecraft	O
)	O
.	O
</s>
<s>
The	O
ATAC	O
was	O
built	O
using	O
AMD	B-General_Concept
2901	I-General_Concept
4-bit	O
processors	O
and	O
had	O
a	O
basic	O
cycle	O
time	O
of	O
250	O
ns	O
.	O
</s>
<s>
It	O
could	O
be	O
programmed	O
in	O
HAL/S	B-Language
,	O
and	O
could	O
be	O
microprogrammed	B-Device
to	O
add	O
new	O
instructions	O
.	O
</s>
<s>
The	O
Galileo	O
Attitude	O
and	O
Articulation	O
Control	O
System	O
(	O
AACSE	O
)	O
was	O
controlled	O
by	O
two	O
Itek	O
Advanced	B-Device
Technology	I-Device
Airborne	I-Device
Computers	I-Device
(	O
ATAC	O
)	O
,	O
built	O
using	O
radiation-hardened	O
2901s	O
.	O
</s>
