<s>
SEAC	B-Device
(	O
Standards	B-Device
Eastern	I-Device
Automatic	I-Device
Computer	I-Device
or	O
Standards	B-Device
Electronic	I-Device
Automatic	I-Device
Computer	I-Device
)	O
was	O
a	O
first-generation	O
electronic	O
computer	O
,	O
built	O
in	O
1950	O
by	O
the	O
U.S.	O
National	O
Bureau	O
of	O
Standards	O
(	O
NBS	O
)	O
and	O
was	O
initially	O
called	O
the	O
National	O
Bureau	O
of	O
Standards	O
Interim	O
Computer	O
,	O
because	O
it	O
was	O
a	O
small-scale	O
computer	O
designed	O
to	O
be	O
built	O
quickly	O
and	O
put	O
into	O
operation	O
while	O
the	O
NBS	O
waited	O
for	O
more	O
powerful	O
computers	O
to	O
be	O
completed	O
(	O
the	O
DYSEAC	B-Device
)	O
.	O
</s>
<s>
The	O
team	O
that	O
developed	O
SEAC	B-Device
was	O
organized	O
by	O
Samuel	O
N	O
.	O
Alexander	O
.	O
</s>
<s>
SEAC	B-Device
was	O
demonstrated	O
in	O
April	O
1950	O
and	O
was	O
dedicated	O
in	O
June	O
1950	O
;	O
it	O
is	O
claimed	O
to	O
be	O
the	O
first	O
fully	O
operational	O
stored-program	B-Architecture
electronic	O
computer	O
in	O
the	O
US	O
.	O
</s>
<s>
Based	O
on	O
EDVAC	B-Device
,	O
SEAC	B-Device
used	O
only	O
747	O
vacuum	O
tubes	O
(	O
a	O
small	O
number	O
for	O
the	O
time	O
)	O
eventually	O
expanded	O
to	O
1,500	O
tubes	O
.	O
</s>
<s>
It	O
had	O
10,500	O
germanium	O
diodes	O
which	O
performed	O
all	O
of	O
the	O
logic	O
functions	O
(	O
see	O
the	O
article	O
diode	B-General_Concept
–	I-General_Concept
transistor	I-General_Concept
logic	I-General_Concept
for	O
the	O
working	O
principles	O
of	O
diode	O
logic	O
)	O
,	O
later	O
expanded	O
to	O
16,000	O
diodes	O
.	O
</s>
<s>
The	O
tubes	O
were	O
used	O
for	O
amplification	O
,	O
inversion	O
and	O
storing	O
information	O
in	O
dynamic	O
flip-flops	B-General_Concept
.	O
</s>
<s>
The	O
machine	O
used	O
64	O
acoustic	O
delay	O
lines	O
to	O
store	O
512words	O
of	O
memory	B-General_Concept
,	O
with	O
each	O
word	O
being	O
45bits	O
in	O
size	O
.	O
</s>
<s>
On	O
some	O
occasions	O
SEAC	B-Device
was	O
used	O
by	O
a	O
remote	O
teletype	O
.	O
</s>
