<s>
The	O
GEC	B-Device
Series	I-Device
63	I-Device
was	O
a	O
32-bit	O
minicomputer	B-Architecture
produced	O
by	O
GEC	B-Device
Computers	I-Device
Limited	I-Device
of	O
the	O
UK	O
during	O
the	O
1980s	O
in	O
conjunction	O
with	O
A	O
.	O
</s>
<s>
Announced	O
in	O
1983	O
,	O
two	O
operating	B-General_Concept
systems	I-General_Concept
were	O
to	O
be	O
offered	O
:	O
UX63	O
and	O
OS6000	O
.	O
</s>
<s>
UX63	O
was	O
a	O
Unix	O
port	O
derived	O
from	O
UNIX	B-Operating_System
System	I-Operating_System
III	I-Operating_System
,	O
whereas	O
OS6000	O
was	O
a	O
port	O
of	O
the	O
OS4000	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
from	O
the	O
GEC	B-Device
4000	I-Device
series	I-Device
(	O
under	O
pressure	O
from	O
the	O
marketing	O
department	O
,	O
concerned	O
about	O
compatibility	O
with	O
its	O
existing	O
user	O
base	O
)	O
.	O
</s>
<s>
Subsequently	O
a	O
version	O
of	O
UNIX	B-Operating_System
System	I-Operating_System
V	I-Operating_System
Release	O
2	O
was	O
added	O
-	O
largely	O
to	O
compete	O
with	O
VAX	B-Device
machines	O
which	O
were	O
becoming	O
the	O
fashionable	O
computer	O
of	O
choice	O
amongst	O
academics	O
,	O
concerned	O
about	O
being	O
able	O
to	O
access	O
software	O
from	O
US	O
colleagues	O
.	O
</s>
<s>
The	O
C	O
compiler	O
,	O
necessary	O
to	O
effect	O
the	O
implementation	O
,	O
was	O
first	O
produced	O
for	O
OS4000	B-Operating_System
and	O
cross-compiled	O
.	O
</s>
<s>
The	O
Unix	O
product	O
was	O
one	O
of	O
the	O
first	O
ports	O
to	O
a	O
different	O
processor	O
architecture	O
undertaken	O
in	O
the	O
UK	O
,	O
with	O
large	O
chunks	O
of	O
the	O
GEC	B-Device
63	I-Device
Unix	O
port	O
done	O
at	O
the	O
University	O
of	O
Edinburgh	O
.	O
</s>
<s>
(	O
Other	O
comparable	O
early	O
Unix	O
ports	O
included	O
that	O
of	O
the	O
High	B-Operating_System
Level	I-Operating_System
Hardware	I-Operating_System
Orion	I-Operating_System
system	O
which	O
launched	O
with	O
4.1BSD	O
Unix	O
in	O
1984	O
,	O
ICL	O
's	O
PNX	O
for	O
the	O
PERQ	B-Device
workstation	I-Device
in	O
1983	O
,	O
and	O
a	O
reported	O
port	O
to	O
a	O
Bleasdale	O
Computer	O
Systems	O
product	O
by	O
Root	O
Computer	O
in	O
early	O
1983	O
.	O
</s>
<s>
These	O
ports	O
were	O
likely	O
to	O
have	O
been	O
fully	O
operational	O
before	O
GEC	B-Device
63	I-Device
Unix	O
was	O
.	O
)	O
</s>
<s>
There	O
were	O
plans	O
for	O
six	O
models	O
,	O
but	O
only	O
two	O
models	O
of	O
the	O
GEC	B-Device
Series	I-Device
63	I-Device
were	O
ever	O
produced	O
:	O
the	O
63/30	O
and	O
the	O
63/40	O
.	O
</s>
<s>
The	O
63/40	O
added	O
an	O
embedded	O
GEC	B-Device
4160	I-Device
minicomputer	B-Architecture
running	O
OS4000	B-Operating_System
to	O
provide	O
additional	O
communications	O
features	O
(	O
such	O
as	O
X.25	B-Protocol
and	O
X.29	O
access	O
)	O
.	O
</s>
<s>
The	O
Series	O
63	O
was	O
used	O
by	O
several	O
UK	O
universities	O
,	O
also	O
being	O
procured	O
with	O
some	O
controversy	O
as	O
part	O
of	O
the	O
Alvey	O
Project	O
,	O
having	O
been	O
chosen	O
as	O
a	O
British-made	O
alternative	O
(	O
along	O
with	O
Systime-produced	O
VAX	B-Device
machines	O
)	O
to	O
the	O
DEC	B-Device
VAX	I-Device
,	O
with	O
DEC	O
's	O
machine	O
being	O
the	O
only	O
one	O
available	O
at	O
the	O
time	O
that	O
was	O
capable	O
of	O
running	O
the	O
specified	O
Berkeley	O
Unix	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
