<s>
The	O
Berkeley	B-General_Concept
Timesharing	I-General_Concept
System	I-General_Concept
was	O
a	O
pioneering	O
time-sharing	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
implemented	O
between	O
1964	O
and	O
1967	O
at	O
the	O
University	O
of	O
California	O
,	O
Berkeley	O
.	O
</s>
<s>
It	O
was	O
designed	O
as	O
part	O
of	O
Project	O
Genie	O
and	O
marketed	O
by	O
Scientific	O
Data	O
Systems	O
for	O
the	O
SDS	B-Device
940	I-Device
computer	O
system	O
.	O
</s>
<s>
It	O
was	O
the	O
first	O
commercial	O
time-sharing	B-General_Concept
which	O
allowed	O
general-purpose	O
user	O
programming	O
,	O
including	O
machine	B-Language
language	I-Language
.	O
</s>
<s>
In	O
the	O
mid-1960s	O
,	O
most	O
computers	O
used	O
batch	B-General_Concept
processing	I-General_Concept
:	O
one	O
user	O
at	O
a	O
time	O
with	O
no	O
interactivity	O
.	O
</s>
<s>
A	O
few	O
pioneering	O
systems	O
such	O
as	O
the	O
Atlas	B-Application
Supervisor	I-Application
at	O
the	O
University	O
of	O
Manchester	O
,	O
Compatible	B-Operating_System
Time-Sharing	I-Operating_System
System	I-Operating_System
at	O
MIT	O
,	O
and	O
the	O
Dartmouth	B-Operating_System
Time	I-Operating_System
Sharing	I-Operating_System
System	I-Operating_System
at	O
Dartmouth	O
College	O
required	O
large	O
expensive	O
machines	O
.	O
</s>
<s>
Implementation	O
started	O
in	O
1964	O
with	O
the	O
arrival	O
of	O
the	O
SDS	B-Device
930	I-Device
which	O
was	O
modified	O
slightly	O
,	O
and	O
an	O
operating	B-General_Concept
system	I-General_Concept
was	O
written	O
from	O
scratch	O
.	O
</s>
<s>
Students	O
who	O
worked	O
on	O
the	O
Berkeley	B-General_Concept
Timesharing	I-General_Concept
System	I-General_Concept
included	O
undergraduates	O
Chuck	O
Thacker	O
and	O
L	O
.	O
Peter	O
Deutsch	O
and	O
doctoral	O
student	O
Butler	O
Lampson	O
.	O
</s>
<s>
Executive	O
(	O
roughly	O
what	O
is	O
now	O
usually	O
called	O
a	O
command-line	B-Application
interface	I-Application
)	O
.	O
</s>
<s>
He	O
thought	O
timesharing	B-General_Concept
had	O
no	O
commercial	O
demand	O
.	O
</s>
<s>
By	O
November	O
1967	O
it	O
was	O
being	O
sold	O
commercially	O
as	O
the	O
SDS	B-Device
940	I-Device
.	O
</s>
<s>
By	O
August	O
1968	O
a	O
version	O
2.0	O
was	O
announced	O
that	O
was	O
just	O
called	O
the	O
"	O
SDS	B-Device
940	I-Device
Time-Sharing	B-General_Concept
System	I-General_Concept
"	O
.	O
</s>
<s>
Other	O
timesharing	B-General_Concept
systems	O
were	O
generally	O
one-of-a-kind	O
systems	O
,	O
or	O
limited	O
to	O
a	O
single	O
application	O
(	O
such	O
as	O
teaching	O
Dartmouth	B-Language
BASIC	I-Language
)	O
.	O
</s>
<s>
The	O
TENEX	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
for	O
the	O
PDP-10	B-Device
mainframe	O
computer	O
used	O
many	O
features	O
of	O
the	O
SDS	B-Device
940	I-Device
Time-Sharing	B-General_Concept
System	I-General_Concept
system	O
,	O
but	O
extended	O
the	O
memory	B-General_Concept
management	I-General_Concept
to	O
include	O
demand	B-General_Concept
paging	I-General_Concept
.	O
</s>
<s>
Some	O
concepts	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
also	O
influenced	O
the	O
design	O
of	O
Unix	B-Application
,	O
whose	O
designer	O
Ken	O
Thompson	O
worked	O
on	O
the	O
SDS	B-Device
940	I-Device
while	O
at	O
Berkeley	O
.	O
</s>
<s>
The	O
QED	B-Application
text	I-Application
editor	I-Application
was	O
first	O
implemented	O
by	O
Butler	O
Lampson	O
and	O
L	O
.	O
Peter	O
Deutsch	O
for	O
the	O
Berkeley	B-General_Concept
Timesharing	I-General_Concept
System	I-General_Concept
in	O
1967	O
.	O
</s>
<s>
Another	O
major	O
customer	O
was	O
Tymshare	O
,	O
who	O
used	O
the	O
system	O
to	O
become	O
the	O
USA	O
's	O
best	O
known	O
commercial	O
timesharing	B-General_Concept
service	O
in	O
the	O
late	O
1960s	O
.	O
</s>
