<s>
The	O
PDP-7	B-Device
was	O
a	O
minicomputer	B-Architecture
produced	O
by	O
Digital	O
Equipment	O
Corporation	O
as	O
part	O
of	O
the	O
PDP	B-Device
series	O
.	O
</s>
<s>
Introduced	O
in	O
1964	O
,	O
shipped	O
since	O
1965	O
,	O
it	O
was	O
the	O
first	O
to	O
use	O
their	O
Flip-Chip	B-Device
technology	O
.	O
</s>
<s>
The	O
PDP-7	B-Device
is	O
the	O
third	O
of	O
Digital	O
's	O
18-bit	B-General_Concept
machines	O
,	O
with	O
essentially	O
the	O
same	O
instruction	B-General_Concept
set	I-General_Concept
architecture	I-General_Concept
as	O
the	O
PDP-4	B-Device
and	O
the	O
PDP-9	B-Device
.	O
</s>
<s>
The	O
PDP-7	B-Device
was	O
the	O
first	O
wire-wrapped	O
PDP	B-Device
computer	O
.	O
</s>
<s>
Input/output	B-General_Concept
(	O
I/O	B-General_Concept
)	O
included	O
a	O
keyboard	O
,	O
printer	O
,	O
punched	O
tape	O
and	O
dual	O
transport	O
DECtape	O
drives	O
(	O
type	O
555	O
)	O
.	O
</s>
<s>
The	O
PDP-7	B-Device
weighed	O
about	O
.	O
</s>
<s>
DECsys	O
,	O
the	O
first	O
operating	O
system	O
for	O
DEC	O
's	O
18-bit	B-General_Concept
computer	O
family	O
(	O
and	O
DEC	O
's	O
first	O
operating	O
system	O
for	O
a	O
computer	O
smaller	O
than	O
its	O
36-bit	O
timesharing	O
systems	O
)	O
,	O
was	O
introduced	O
in	O
1965	O
.	O
</s>
<s>
It	O
provided	O
an	O
interactive	O
,	O
single	O
user	O
,	O
program	O
development	O
environment	O
for	O
Fortran	B-Application
and	O
assembly	B-Language
language	I-Language
programs	O
.	O
</s>
<s>
In	O
1969	O
,	O
Ken	O
Thompson	O
wrote	O
the	O
first	O
UNIX	B-Application
system	I-Application
,	O
then	O
named	O
Unics	O
as	O
a	O
pun	O
on	O
Multics	B-Application
despite	O
only	O
using	O
two	O
design	O
elements	O
from	O
Multics	B-Application
,	O
in	O
assembly	B-Language
language	I-Language
on	O
a	O
PDP-7	B-Device
,	O
as	O
the	O
operating	O
system	O
for	O
Space	B-Application
Travel	I-Application
,	O
a	O
game	O
which	O
requires	O
graphics	O
to	O
depict	O
the	O
motion	O
of	O
the	O
planets	O
.	O
</s>
<s>
A	O
PDP-7	B-Device
was	O
also	O
the	O
development	O
system	O
used	O
during	O
the	O
development	O
of	O
MUMPS	B-Language
at	O
MGH	O
in	O
Boston	O
a	O
few	O
years	O
earlier	O
.	O
</s>
<s>
The	O
PDP-7	B-Device
was	O
described	O
as	O
"	O
highly	O
successful.	O
"	O
</s>
<s>
A	O
combined	O
total	O
of	O
120	O
of	O
the	O
PDP-7	B-Device
and	O
PDP-7A	O
were	O
sold	O
.	O
</s>
<s>
At	O
least	O
four	O
PDP-7s	B-Device
were	O
confirmed	O
to	O
still	O
exist	O
as	O
of	O
2011	O
and	O
a	O
fifth	O
was	O
discovered	O
in	O
2017	O
.	O
</s>
<s>
A	O
PDP-7A	O
(	O
serial	O
number	O
115	O
)	O
was	O
under	O
restoration	O
in	O
Oslo	O
,	O
Norway	O
;	O
a	O
second	O
PDP-7A	O
(	O
serial	O
number	O
113	O
)	O
previously	O
located	O
at	O
the	O
University	O
of	O
Oregon	O
in	O
its	O
Nuclear	O
Physics	O
laboratory	O
is	O
now	O
at	O
the	O
Living	O
Computer	O
Museum	O
in	O
Seattle	O
,	O
Washington	O
and	O
is	O
completely	O
restored	O
to	O
running	O
condition	O
after	O
being	O
disassembled	O
for	O
transport	O
;	O
Another	O
PDP-7	B-Device
(	O
serial	O
number	O
47	O
)	O
is	O
known	O
to	O
be	O
in	O
the	O
collection	O
of	O
Max	O
Burnet	O
near	O
Sydney	O
,	O
Australia	O
,	O
a	O
fourth	O
PDP-7	B-Device
(	O
serial	O
number	O
33	O
)	O
is	O
in	O
storage	O
at	O
the	O
Computer	O
History	O
Museum	O
in	O
Mountain	O
View	O
,	O
California	O
and	O
a	O
fifth	O
PDP-7	B-Device
(	O
serial	O
number	O
129	O
)	O
belonging	O
to	O
Fred	O
Yerian	O
is	O
also	O
located	O
at	O
the	O
Museum	O
,	O
and	O
has	O
been	O
demonstrated	O
running	O
Unix	B-Application
version	O
0	O
and	O
compiling	O
a	O
B	B-Language
program	I-Language
.	O
</s>
