<s>
The	O
Harvard	B-Device
Mark	I-Device
III	I-Device
,	O
also	O
known	O
as	O
ADEC	B-Device
(	O
for	O
Aiken	B-Device
Dahlgren	I-Device
Electronic	I-Device
Calculator	I-Device
)	O
was	O
an	O
early	O
computer	O
that	O
was	O
partially	O
electronic	O
and	O
partially	O
electromechanical	O
.	O
</s>
<s>
It	O
used	O
magnetic	B-General_Concept
drum	I-General_Concept
memory	I-General_Concept
of	O
4,350	O
words	O
.	O
</s>
<s>
The	O
Mark	O
III	O
used	O
nine	O
magnetic	B-General_Concept
drums	I-General_Concept
(	O
one	O
of	O
the	O
first	O
computers	O
to	O
do	O
so	O
)	O
.	O
</s>
<s>
This	O
separation	O
of	O
data	O
and	O
instructions	O
is	O
known	O
as	O
the	O
Harvard	B-Architecture
architecture	I-Architecture
.	O
</s>
