<s>
HITAC	B-Device
(	O
HItachi	O
Transistor	B-Application
Automatic	O
Computer	O
)	O
is	O
the	O
designation	O
for	O
the	O
majority	O
of	O
Hitachi	O
large	O
and	O
midrange	O
computer	O
models	O
spanning	O
several	O
decades	O
.	O
</s>
<s>
The	O
HITAC	B-Device
301	O
,	O
released	O
in	O
May	O
1958	O
,	O
was	O
Hitachi	O
's	O
first	O
fully	O
transistorized	O
computer	O
model	O
.	O
</s>
<s>
Earlier	O
Hitachi	O
computers	O
made	O
use	O
of	O
semiconductors	O
known	O
as	O
parametrons	B-Device
.	O
</s>
<s>
As	O
a	O
prototype	O
for	O
the	O
parametron	B-Device
logic	O
circuit	O
,	O
the	O
HIPAC-MK-1	O
was	O
developed	O
.	O
</s>
<s>
It	O
was	O
then	O
that	O
as	O
Parametron	B-Device
calculators	O
,	O
the	O
HIPAC	O
101	O
and	O
HIPAC	O
103	O
became	O
commercialized	O
products	O
.	O
</s>
<s>
Parallel	O
research	O
in	O
transistor	B-Application
computers	O
soon	O
became	O
commercialized	O
as	O
well	O
.	O
</s>
<s>
1024	O
words	O
of	O
Drum	B-General_Concept
memory	I-General_Concept
.	O
</s>
<s>
2048	O
words	O
of	O
Drum	B-General_Concept
memory	I-General_Concept
.	O
</s>
<s>
fixed/floating	O
-point	O
.	O
</s>
<s>
(	O
8192	O
words	O
of	O
Drum	B-General_Concept
memory	I-General_Concept
)	O
.	O
</s>
<s>
In	O
the	O
following	O
year	O
,	O
the	O
HITAC	B-Device
501	O
was	O
released	O
and	O
now	O
supplies	O
the	O
Eastern	O
Osaka	O
Kansai	O
Electric	O
substation	O
as	O
a	O
control	O
system	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
Electric	O
Testing	O
Lab	O
still	O
accepts	O
orders	O
for	O
the	O
ETL	O
Mark	O
V	O
.	O
Using	O
this	O
as	O
a	O
base	O
,	O
researchers	O
at	O
the	O
University	O
of	O
Kyoto	O
cooperated	O
to	O
improve	O
the	O
technology	O
which	O
resulted	O
in	O
the	O
HITAC	B-Device
102	O
(	O
also	O
referred	O
to	O
as	O
the	O
Kyoto-Daigaku	O
Digital	O
Computer	O
1	O
)	O
.	O
</s>
<s>
Researchers	O
at	O
Japan	O
's	O
Economic	O
Planning	O
Agency	O
introduced	O
an	O
improved	O
version	O
(	O
HITAC	B-Device
102B	O
)	O
as	O
a	O
substitute	O
to	O
the	O
punch	O
card	O
system	O
.	O
</s>
<s>
In	O
1961	O
,	O
the	O
HITAC	B-Device
201	O
was	O
developed	O
as	O
a	O
smaller	O
computer	O
for	O
business	O
use	O
.	O
</s>
<s>
1960	O
words	O
of	O
Drum	B-General_Concept
memory	I-General_Concept
.	O
</s>
<s>
4000	O
words	O
of	O
Drum	B-General_Concept
memory	I-General_Concept
.	O
</s>
<s>
Moreover	O
,	O
in	O
1958	O
,	O
The	O
Railway	O
Technical	O
Research	O
Institute	O
of	O
Japan	O
dispatched	O
MARS	B-Application
.	O
</s>
<s>
Although	O
the	O
first	O
version	O
of	O
MARS	B-Application
did	O
not	O
include	O
the	O
HITAC	B-Device
system	O
,	O
its	O
successor	O
MARS101	O
utilized	O
the	O
HITAC	B-Device
3030	O
.	O
</s>
