<s>
EDVAC	B-Device
(	O
Electronic	B-Device
Discrete	I-Device
Variable	I-Device
Automatic	I-Device
Computer	I-Device
)	O
was	O
one	O
of	O
the	O
earliest	O
electronic	O
computers	O
.	O
</s>
<s>
Along	O
with	O
ORDVAC	B-Device
,	O
it	O
was	O
a	O
successor	O
to	O
the	O
ENIAC	B-Device
.	O
</s>
<s>
Unlike	O
ENIAC	B-Device
,	O
it	O
was	O
binary	O
rather	O
than	O
decimal	B-Application
,	O
and	O
was	O
designed	O
to	O
be	O
a	O
stored-program	O
computer	O
.	O
</s>
<s>
ENIAC	B-Device
inventors	O
,	O
John	O
Mauchly	O
and	O
J	O
.	O
Presper	O
Eckert	O
,	O
proposed	O
the	O
EDVAC	B-Device
's	O
construction	O
in	O
August	O
1944	O
.	O
</s>
<s>
EDVAC	B-Device
was	O
delivered	O
to	O
the	O
Ballistic	O
Research	O
Laboratory	O
in	O
1949	O
.	O
</s>
<s>
Functionally	O
,	O
EDVAC	B-Device
was	O
a	O
binary	O
serial	B-Device
computer	I-Device
with	O
automatic	O
addition	O
,	O
subtraction	O
,	O
multiplication	O
,	O
programmed	O
division	O
and	O
automatic	O
checking	O
with	O
an	O
ultrasonic	O
serial	O
memory	O
having	O
a	O
capacity	O
of	O
1,024	O
44-bit	O
words	O
.	O
</s>
<s>
EDVAC	B-Device
's	O
average	O
addition	O
time	O
was	O
864	O
microseconds	O
and	O
its	O
average	O
multiplication	O
time	O
was	O
2,900	O
microseconds	O
.	O
</s>
<s>
ENIAC	B-Device
inventors	O
John	O
Mauchly	O
and	O
J	O
.	O
Presper	O
Eckert	O
proposed	O
EDVAC	B-Device
's	O
construction	O
in	O
August	O
1944	O
,	O
and	O
design	O
work	O
for	O
EDVAC	B-Device
commenced	O
before	O
ENIAC	B-Device
was	O
fully	O
operational	O
.	O
</s>
<s>
The	O
design	O
would	O
implement	O
a	O
number	O
of	O
important	O
architectural	O
and	O
logical	O
improvements	O
conceived	O
during	O
the	O
ENIAC	B-Device
's	O
construction	O
and	O
would	O
incorporate	O
a	O
high-speed	O
serial-access	O
memory	O
.	O
</s>
<s>
Like	O
the	O
ENIAC	B-Device
,	O
the	O
EDVAC	B-Device
was	O
built	O
for	O
the	O
U.S.	O
Army	O
's	O
Ballistics	O
Research	O
Laboratory	O
at	O
the	O
Aberdeen	O
Proving	O
Ground	O
by	O
the	O
University	O
of	O
Pennsylvania	O
's	O
Moore	O
School	O
of	O
Electrical	O
Engineering	O
.	O
</s>
<s>
Eckert	O
and	O
Mauchly	O
and	O
the	O
other	O
ENIAC	B-Device
designers	O
were	O
joined	O
by	O
John	O
von	O
Neumann	O
in	O
a	O
consulting	O
role	O
;	O
von	O
Neumann	O
summarized	O
and	O
discussed	O
logical	O
design	O
developments	O
in	O
the	O
1945	O
First	O
Draft	O
of	O
a	O
Report	O
on	O
the	O
EDVAC	B-Device
.	O
</s>
<s>
The	O
final	O
cost	O
of	O
EDVAC	B-Device
,	O
however	O
,	O
was	O
similar	O
to	O
the	O
ENIAC	B-Device
's	O
,	O
at	O
just	O
under	O
$	O
500,000	O
.	O
</s>
<s>
Raytheon	O
company	O
was	O
a	O
subcontractor	O
on	O
EDVAC	B-Device
machines	O
.	O
</s>
<s>
The	O
EDVAC	B-Device
was	O
a	O
binary	O
serial	B-Device
computer	I-Device
with	O
automatic	O
addition	O
,	O
subtraction	O
,	O
multiplication	O
,	O
programmed	O
division	O
and	O
automatic	O
checking	O
with	O
an	O
ultrasonic	O
serial	O
memory	O
capacity	O
of	O
1,024	O
44-bit	O
words	O
,	O
thus	O
giving	O
a	O
memory	O
,	O
in	O
modern	O
terms	O
,	O
of	O
5.6	O
kilobytes	O
.	O
</s>
<s>
EDVAC	B-Device
's	O
average	O
addition	O
time	O
was	O
864	O
microseconds	O
(	O
about	O
1,160	O
operations	O
per	O
second	O
)	O
and	O
its	O
average	O
multiplication	O
time	O
was	O
2,900	O
microseconds	O
(	O
about	O
340operations	O
per	O
second	O
)	O
.	O
</s>
<s>
EDVAC	B-Device
could	O
also	O
do	O
floating-point	B-Algorithm
arithmetic	I-Algorithm
.	O
</s>
<s>
It	O
used	O
33	O
bits	O
for	O
the	O
mantissa	B-Algorithm
and	O
one	O
bit	O
for	O
its	O
sign	O
.	O
</s>
<s>
John	O
Von	O
Neumann	O
's	O
famous	O
EDVAC	B-Device
monograph	O
,	O
First	O
Draft	O
of	O
a	O
Report	O
on	O
the	O
EDVAC	B-Device
,	O
proposed	O
the	O
main	O
enhancement	O
to	O
its	O
design	O
that	O
embodied	O
the	O
principal	O
"	O
stored-program	O
"	O
concept	O
that	O
we	O
now	O
call	O
the	O
Von	B-Architecture
Neumann	I-Architecture
architecture	I-Architecture
.	O
</s>
<s>
The	O
British	O
computers	O
EDSAC	B-Device
at	O
Cambridge	O
and	O
the	O
Manchester	B-Device
Baby	I-Device
were	O
the	O
first	O
working	O
computers	O
that	O
followed	O
this	O
design	O
.	O
</s>
<s>
Having	O
the	O
program	O
and	O
data	O
in	O
different	O
memories	O
is	O
now	O
called	O
the	O
Harvard	B-Architecture
architecture	I-Architecture
to	O
distinguish	O
it	O
.	O
</s>
<s>
EDVAC	B-Device
was	O
delivered	O
to	O
the	O
Ballistics	O
Research	O
Laboratory	O
in	O
1949	O
.	O
</s>
<s>
By	O
1957	O
,	O
EDVAC	B-Device
was	O
running	O
over	O
20	O
hours	O
a	O
day	O
with	O
error-free	O
run	O
time	O
averaging	O
8	O
hours	O
.	O
</s>
<s>
EDVAC	B-Device
received	O
a	O
number	O
of	O
upgrades	O
including	O
punch-card	B-Architecture
I/O	O
in	O
1954	O
,	O
extra	O
memory	O
in	O
slower	O
magnetic	B-General_Concept
drum	I-General_Concept
form	O
in	O
1955	O
,	O
and	O
a	O
floating-point	B-Algorithm
arithmetic	I-Algorithm
unit	O
in	O
1958	O
.	O
</s>
<s>
EDVAC	B-Device
ran	O
until	O
1962	O
when	O
it	O
was	O
replaced	O
by	O
BRLESC	B-Device
.	O
</s>
