<s>
DYSEAC	B-Device
was	O
the	O
second	O
Standards	B-Device
Electronic	I-Device
Automatic	I-Device
Computer	I-Device
.	O
</s>
<s>
(	O
See	O
SEAC	B-Device
.	O
)	O
</s>
<s>
DYSEAC	B-Device
was	O
a	O
first-generation	O
computer	O
built	O
by	O
the	O
National	O
Bureau	O
of	O
Standards	O
for	O
the	O
U.S.	O
Army	O
Signal	O
Corps	O
.	O
</s>
<s>
DYSEAC	B-Device
used	O
900	O
vacuum	O
tubes	O
and	O
24,500	O
crystal	O
diodes	O
.	O
</s>
<s>
It	O
had	O
a	O
memory	B-General_Concept
of	O
512words	O
of	O
45bits	O
each	O
(	O
plus	O
1	O
parity	B-Error_Name
bit	I-Error_Name
)	O
,	O
using	O
mercury	O
delay-line	O
memory	B-General_Concept
.	O
</s>
<s>
Memory	B-General_Concept
access	O
time	O
was	O
48	O
–	O
384microseconds	O
.	O
</s>
<s>
These	O
times	O
are	O
excluding	O
the	O
memory-access	O
time	O
,	O
which	O
added	O
up	O
to	O
approximately	O
1500microseconds	O
to	O
those	O
times	O
.	O
</s>
<s>
DYSEAC	B-Device
weighed	O
about	O
.	O
</s>
