<s>
The	O
Cyclone	B-Device
,	O
was	O
a	O
vacuum	O
tube	O
computer	O
,	O
built	O
by	O
Iowa	O
State	O
College	O
(	O
later	O
University	O
)	O
at	O
Ames	O
,	O
Iowa	O
.	O
</s>
<s>
It	O
was	O
based	O
on	O
the	O
IAS	B-Device
architecture	O
developed	O
by	O
John	O
von	O
Neumann	O
.	O
</s>
<s>
The	O
prototype	O
was	O
ILLIAC	B-Device
,	O
the	O
University	O
of	O
Illinois	O
Automatic	O
Computer	O
.	O
</s>
<s>
The	O
Cyclone	B-Device
used	O
40-bit	O
words	O
,	O
used	O
two	O
20-bit	O
instructions	O
per	O
word	O
,	O
and	O
each	O
instruction	O
had	O
an	O
eight-bit	O
op-code	B-Language
and	O
a	O
12-bit	O
operand	O
or	O
address	O
field	O
.	O
</s>
<s>
In	O
general	O
IAS-based	O
computers	O
were	O
not	O
code	O
compatible	O
with	O
each	O
other	O
,	O
although	O
originally	O
math	O
routines	O
which	O
ran	O
on	O
the	O
ILLIAC	B-Device
would	O
also	O
run	O
on	O
the	O
Cyclone	B-Device
.	O
</s>
<s>
The	O
Cyclone	B-Device
was	O
completed	O
just	O
as	O
the	O
transistor	O
was	O
replacing	O
the	O
vacuum	O
tube	O
as	O
an	O
active	O
computing	O
element	O
.	O
</s>
<s>
The	O
Cyclone	B-Device
had	O
about	O
2,500	O
vacuum	O
tubes	O
,	O
1,521	O
of	O
which	O
were	O
type	O
5844	O
.	O
</s>
<s>
(	O
The	O
IBM	B-Device
1401	I-Device
computer	O
,	O
announced	O
the	O
same	O
year	O
,	O
was	O
fully	O
transistorized	O
.	O
</s>
<s>
About	O
15,000	O
IBM	B-Device
1401	I-Device
machines	O
were	O
produced	O
.	O
)	O
</s>
<s>
The	O
supervisor	O
of	O
the	O
Cyclone	B-Device
computer	O
construction	O
was	O
Dr.	O
R	O
.	O
M	O
.	O
Stewart	O
,	O
a	O
professor	O
of	O
physics	O
at	O
ISC	O
(	O
now	O
ISU	O
)	O
.	O
</s>
<s>
Robert	O
Asbury	O
Sharpe	O
organized	O
and	O
taught	O
courses	O
for	O
interested	O
faculty	O
and	O
wrote	O
an	O
assembler	B-Language
as	O
well	O
as	O
an	O
ALGOL	B-Language
compiler	O
for	O
the	O
Cyclone	B-Device
.	O
</s>
<s>
The	O
Cyclone	B-Device
solved	O
40	O
equations	O
with	O
40	O
unknowns	O
in	O
less	O
than	O
four	O
minutes	O
.	O
</s>
<s>
This	O
was	O
the	O
same	O
type	O
of	O
problem	O
that	O
the	B-Device
Atanasoff	I-Device
–	I-Device
Berry	I-Device
Computer	I-Device
was	O
designed	O
to	O
solve	O
twenty	O
years	O
earlier	O
at	O
the	O
same	O
college	O
.	O
</s>
<s>
The	O
Cyclone	B-Device
computer	O
was	O
10	O
feet	O
tall	O
,	O
12	O
feet	O
long	O
,	O
3	O
feet	O
wide	O
,	O
and	O
contained	O
over	O
2,700	O
vacuum	O
tubes	O
.	O
</s>
<s>
The	O
Cyclone	B-Device
used	O
19	O
kW	O
of	O
electric	O
power	O
and	O
weighed	O
about	O
.	O
</s>
<s>
The	O
original	O
Cyclone	B-Device
had	O
:	O
</s>
<s>
Memory	O
was	O
originally	O
1,024	O
40-bit	O
words	O
of	O
Williams	B-General_Concept
tube	I-General_Concept
electrostatic	O
memory	O
.	O
</s>
<s>
The	O
Cyclone	B-Device
had	O
a	O
major	O
rebuild	O
about	O
1961	O
:	O
</s>
<s>
The	O
console	O
printer	O
was	O
upgraded	O
to	O
a	O
right-hole	O
Friden	B-Application
Flexowriter	I-Application
.	O
</s>
<s>
1024-word	O
Williams	B-General_Concept
memory	I-General_Concept
was	O
replaced	O
by	O
four	O
banks	O
of	O
magnetic-core	O
memory	O
,	O
4096	O
words	O
in	O
each	O
bank	O
.	O
</s>
<s>
All	O
IAS	B-Device
derivatives	O
used	O
an	O
asynchronous	O
CPU	O
,	O
with	O
no	O
clock	O
.	O
</s>
<s>
The	O
Cyclone	B-Device
had	O
a	O
loudspeaker	O
system	O
connected	O
to	O
the	O
sign	O
bit	O
of	O
the	O
accumulator	O
.	O
</s>
<s>
The	O
Iowa	O
State	O
Cyclone	B-Device
is	O
distinct	O
from	O
the	B-Device
Atanasoff	I-Device
–	I-Device
Berry	I-Device
Computer	I-Device
of	O
the	O
late	O
1930s	O
-	O
neither	O
John	O
Vincent	O
Atanasoff	O
nor	O
Clifford	O
Berry	O
worked	O
on	O
this	O
machine	O
.	O
</s>
