<s>
The	O
Parametron	B-Device
Computer	O
1	O
(	O
PC-1	B-Device
)	O
was	O
a	O
binary	O
,	O
single-address	O
computer	O
developed	O
at	O
Professor	O
Hidetosi	O
Takahasi	O
's	O
Laboratory	O
at	O
the	O
Department	O
of	O
Physics	O
,	O
University	O
of	O
Tokyo	O
,	O
and	O
was	O
one	O
of	O
the	O
first	O
general	O
purpose	O
computers	O
that	O
used	O
parametron	B-Device
components	O
and	O
dual	O
frequency	O
magnetic-core	O
memory	O
.	O
</s>
<s>
The	O
PC-1	B-Device
was	O
used	O
at	O
Takahasi	O
's	O
Laboratory	O
for	O
research	O
related	O
both	O
to	O
hardware	O
and	O
software	O
and	O
the	O
researchers	O
in	O
the	O
Faculty	O
of	O
Science	O
also	O
used	O
it	O
for	O
scientific	O
computing	O
.	O
</s>
<s>
The	O
PC-1	B-Device
was	O
retired	O
in	O
May	O
1964	O
.	O
</s>
<s>
The	O
arithmetic	O
and	O
control	O
circuits	O
of	O
the	O
PC	O
–	O
1	O
consisted	O
of	O
4200	O
parametrons	B-Device
.	O
</s>
