<s>
The	O
MUSASINO-1	B-Device
was	O
one	O
of	O
the	O
earliest	O
electronic	O
digital	O
computers	O
built	O
in	O
Japan	O
.	O
</s>
<s>
Saburo	O
Muroga	O
,	O
a	O
University	O
of	O
Illinois	O
visiting	O
scholar	O
and	O
member	O
of	O
the	O
ILLIAC	B-Device
I	I-Device
team	O
,	O
returned	O
to	O
Japan	O
and	O
oversaw	O
the	O
construction	O
of	O
MUSASINO-1	B-Device
.	O
</s>
<s>
Using	O
519	O
vacuum	O
tubes	O
and	O
5,400	O
parametrons	B-Device
,	O
the	O
MUSASINO-1	B-Device
possessed	O
a	O
magnetic	O
core	O
memory	O
,	O
initially	O
of	O
32	O
(	O
later	O
expanded	O
to	O
256	O
)	O
words	O
.	O
</s>
<s>
The	O
MUSASINO-1	B-Device
'	O
s	O
instruction	B-General_Concept
set	I-General_Concept
was	O
a	O
superset	O
of	O
the	O
ILLIAC	B-Device
I	I-Device
's	O
instructions	O
,	O
so	O
it	O
could	O
generally	O
use	O
the	O
latter	O
's	O
software	O
.	O
</s>
<s>
However	O
,	O
many	O
of	O
the	O
programs	O
for	O
the	O
ILLIAC	O
used	O
some	O
of	O
the	O
unused	O
bits	O
in	O
the	O
instructions	O
to	O
store	O
data	O
,	O
and	O
these	O
would	O
be	O
interpreted	O
as	O
a	O
different	O
instructions	O
by	O
the	O
MUSASINO-1	B-Device
control	O
circuitry	O
.	O
</s>
