<s>
The	O
IAS	B-Device
machine	I-Device
was	O
the	O
first	O
electronic	O
computer	O
built	O
at	O
the	O
Institute	O
for	O
Advanced	O
Study	O
(	O
IAS	B-Device
)	O
in	O
Princeton	O
,	O
New	O
Jersey	O
.	O
</s>
<s>
It	O
is	O
sometimes	O
called	O
the	O
von	O
Neumann	O
machine	O
,	O
since	O
the	O
paper	O
describing	O
its	O
design	O
was	O
edited	O
by	O
John	O
von	O
Neumann	O
,	O
a	O
mathematics	O
professor	O
at	O
both	O
Princeton	O
University	O
and	O
IAS	B-Device
.	O
</s>
<s>
The	O
general	O
organization	O
is	O
called	O
von	B-Architecture
Neumann	I-Architecture
architecture	I-Architecture
,	O
even	O
though	O
it	O
was	O
both	O
conceived	O
and	O
implemented	O
by	O
others	O
.	O
</s>
<s>
Hewitt	O
Crane	O
,	O
Herman	O
Goldstine	O
,	O
Gerald	O
Estrin	O
,	O
Arthur	O
Burks	O
,	O
George	B-Device
W	O
.	O
Brown	O
and	O
Willis	O
Ware	O
also	O
worked	O
on	O
the	O
project	O
.	O
</s>
<s>
The	O
IAS	B-Device
machine	I-Device
was	O
a	O
binary	O
computer	O
with	O
a	O
40-bit	O
word	O
,	O
storing	O
two	O
20-bit	O
instructions	O
in	O
each	O
word	O
.	O
</s>
<s>
Negative	O
numbers	O
were	O
represented	O
in	O
two	B-General_Concept
's	I-General_Concept
complement	I-General_Concept
format	O
.	O
</s>
<s>
It	O
had	O
two	O
general-purpose	O
registers	B-General_Concept
available	O
:	O
the	O
Accumulator	O
(	O
AC	O
)	O
and	O
Multiplier/Quotient	O
(	O
MQ	O
)	O
.	O
</s>
<s>
It	O
used	O
1,700	O
vacuum	O
tubes	O
(	O
triode	O
types	O
:	O
6J6	O
,	O
5670	O
,	O
5687	O
,	O
a	O
few	O
diodes	O
:	O
type	O
6AL5	O
,	O
150	O
pentodes	O
to	O
drive	O
the	O
memory	O
CRTs	O
,	O
and	O
41	O
CRTs	O
(	O
type	O
:	O
5CP1A	O
)	O
:	O
40	O
used	O
as	O
Williams	B-General_Concept
tubes	I-General_Concept
for	O
memory	O
plus	O
one	O
more	O
to	O
monitor	O
the	O
state	O
of	O
a	O
memory	O
tube	O
)	O
.	O
</s>
<s>
Problems	O
with	O
the	O
development	O
of	O
these	O
complex	O
tubes	O
forced	O
the	O
switch	O
to	O
Williams	B-General_Concept
tubes	I-General_Concept
.	O
</s>
<s>
It	O
was	O
an	O
asynchronous	B-Application
machine	O
,	O
meaning	O
that	O
there	O
was	O
no	O
central	O
clock	O
regulating	O
the	O
timing	O
of	O
the	O
instructions	O
.	O
</s>
<s>
Although	O
some	O
claim	O
the	O
IAS	B-Device
machine	I-Device
was	O
the	O
first	O
design	O
to	O
mix	O
programs	O
and	O
data	O
in	O
a	O
single	O
memory	O
,	O
that	O
had	O
been	O
implemented	O
four	O
years	O
earlier	O
by	O
the	O
1948	O
Manchester	B-Device
Baby	I-Device
.	O
</s>
<s>
The	O
Soviet	O
MESM	B-Device
also	O
became	O
operational	O
prior	O
to	O
the	O
IAS	B-Device
machine	I-Device
.	O
</s>
<s>
Plans	O
for	O
the	O
IAS	B-Device
machine	I-Device
were	O
widely	O
distributed	O
to	O
any	O
schools	O
,	O
businesses	O
,	O
or	O
companies	O
interested	O
in	O
computing	O
machines	O
,	O
resulting	O
in	O
the	O
construction	O
of	O
several	O
derivative	O
computers	O
referred	O
to	O
as	O
"	O
IAS	B-Device
machines	I-Device
,	O
"	O
although	O
they	O
were	O
not	O
software	O
compatible	O
.	O
</s>
<s>
Some	O
of	O
these	O
"	O
IAS	B-Device
machines	I-Device
"	O
were	O
:	O
</s>
<s>
SEAC	B-Device
(	O
Washington	O
,	O
D.C.	O
)	O
</s>
