<s>
The	O
RCA	B-Device
501	I-Device
was	O
a	O
transistor	B-Application
computer	O
manufactured	O
by	O
RCA	O
beginning	O
in	O
1958	O
.	O
</s>
<s>
RCA	O
's	O
pioneering	O
work	O
in	O
transistors	B-Application
in	O
other	O
products	O
provided	O
its	O
engineers	O
with	O
the	O
basis	O
needed	O
to	O
design	O
effective	O
use	O
of	O
transistors	B-Application
in	O
early	O
solid-state	O
electronic	O
computer	O
systems	O
as	O
well	O
.	O
</s>
<s>
After	O
three	O
years	O
of	O
development	O
,	O
RCA	O
introduced	O
by	O
1959	O
the	O
all-transistor	O
RCA	B-Device
501	I-Device
,	O
a	O
medium	O
-	O
to	O
large-scale	O
computer	O
which	O
according	O
to	O
the	O
sales	O
brochures	O
was	O
"	O
the	O
world	O
's	O
most	O
advanced	O
electronic	O
data	O
processing	O
system	O
"	O
.	O
</s>
<s>
A	O
compatible	O
version	O
of	O
the	O
RCA	B-Device
501	I-Device
was	O
sold	O
by	O
English	O
Electric	O
as	O
their	O
model	O
KDP10/KDF8	B-Device
.	O
</s>
<s>
The	O
RCA	B-Device
501	I-Device
utilized	O
advanced	O
manufacturing	O
techniques	O
such	O
as	O
pluggable	O
card	O
units	O
or	O
printed	O
circuit	O
boards	O
.	O
</s>
<s>
It	O
also	O
included	O
a	O
centralized	B-Device
operating	I-Device
console	I-Device
,	O
from	O
which	O
the	O
operator	O
could	O
control	O
all	O
aspects	O
of	O
the	O
computer	O
from	O
one	O
location	O
,	O
including	O
starting	O
and	O
stopping	O
of	O
programs	O
.	O
</s>
<s>
An	O
optional	O
drum	B-General_Concept
memory	I-General_Concept
unit	O
could	O
provide	O
up	O
to	O
1.5	O
million	O
characters	O
of	O
storage	O
,	O
and	O
up	O
to	O
63	O
magnetic	O
tape	O
units	O
could	O
be	O
installed	O
.	O
</s>
