<s>
TOPS-10	B-Operating_System
System	O
(	O
Timesharing	O
/	O
Total	O
Operating	O
System-10	O
)	O
is	O
a	O
discontinued	O
operating	B-General_Concept
system	I-General_Concept
from	O
Digital	O
Equipment	O
Corporation	O
(	O
DEC	O
)	O
for	O
the	O
PDP-10	B-Device
(	O
or	O
DECsystem-10	B-Device
)	O
mainframe	B-Architecture
computer	I-Architecture
family	O
.	O
</s>
<s>
Launched	O
in	O
1967	O
,	O
TOPS-10	B-Operating_System
evolved	O
from	O
the	O
earlier	O
"	O
Monitor	O
"	O
software	O
for	O
the	O
PDP-6	B-Device
and	O
PDP-10	B-Device
computers	O
;	O
this	O
was	O
renamed	O
to	O
TOPS-10	B-Operating_System
in	O
1970	O
.	O
</s>
<s>
TOPS-10	B-Operating_System
supported	O
shared	B-Operating_System
memory	I-Operating_System
and	O
allowed	O
the	O
development	O
of	O
one	O
of	O
the	O
first	O
true	O
multiplayer	O
computer	O
games	O
.	O
</s>
<s>
The	O
game	O
,	O
called	O
DECWAR	B-Application
,	O
was	O
a	O
text-oriented	O
Star	B-Operating_System
Trek	I-Operating_System
type	B-Device
game	O
.	O
</s>
<s>
Users	O
at	O
terminals	O
typed	O
in	O
commands	B-Application
and	O
fought	O
each	O
other	O
in	O
real	O
time	O
.	O
</s>
<s>
TOPS-10	B-Operating_System
was	O
also	O
the	O
home	O
of	O
the	O
original	O
Multi	O
User	O
Dungeon	O
,	O
MUD	B-Protocol
,	O
the	O
fore	O
runner	O
to	O
today	O
's	O
MMORPGs	B-Protocol
.	O
</s>
<s>
This	O
application	O
was	O
perhaps	O
the	O
first	O
so-called	O
CB	B-Protocol
Simulator	I-Protocol
that	O
allowed	O
users	O
to	O
converse	O
with	O
one	O
another	O
in	O
what	O
is	O
now	O
known	O
as	O
a	O
chat	O
room	O
.	O
</s>
<s>
TOPS-10	B-Operating_System
had	O
a	O
very	O
robust	O
application	B-Application
programming	I-Application
interface	I-Application
(	O
API	B-Application
)	O
that	O
used	O
a	O
mechanism	O
called	O
a	O
UUO	O
or	O
Unimplemented	O
User	O
Operation	O
.	O
</s>
<s>
UUOs	O
implemented	O
operating	B-General_Concept
system	I-General_Concept
calls	O
in	O
a	O
way	O
that	O
made	O
them	O
look	O
like	O
machine	O
instructions	O
.	O
</s>
<s>
The	O
Monitor	O
Call	O
API	B-Application
was	O
very	O
much	O
ahead	O
of	O
its	O
time	O
,	O
like	O
most	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
,	O
and	O
made	O
system	O
programming	O
on	O
DECsystem-10s	B-Device
simple	O
and	O
powerful	O
.	O
</s>
<s>
The	O
TOPS-10	B-Operating_System
scheduler	O
supported	O
prioritized	O
run	O
queues	O
,	O
and	O
appended	O
a	O
process	O
onto	O
a	O
queue	O
depending	O
on	O
its	O
priority	O
.	O
</s>
<s>
The	O
following	O
list	O
of	O
commands	B-Application
are	O
supported	O
by	O
TOPS-10	B-Operating_System
.	O
</s>
<s>
The	O
PDP-6	B-Device
Monitor	O
software	O
was	O
first	O
released	O
in	O
1964	O
.	O
</s>
<s>
Support	O
for	O
the	O
PDP-10	B-Device
'	O
s	O
KA10	O
processor	O
was	O
added	O
to	O
the	O
Monitor	O
in	O
release	O
2.18	O
in	O
1967	O
.	O
</s>
<s>
The	O
TOPS-10	B-Operating_System
name	O
was	O
first	O
used	O
in	O
1970	O
for	O
release	O
5.01	O
.	O
</s>
<s>
Release	O
6.01	O
(	O
May	O
1974	O
)	O
was	O
the	O
first	O
TOPS-10	B-Operating_System
to	O
implement	O
virtual	B-Architecture
memory	I-Architecture
(	O
demand	O
paging	O
)	O
,	O
enabling	O
programs	O
larger	O
than	O
physical	O
memory	O
to	O
be	O
run	O
.	O
</s>
<s>
The	O
final	O
release	O
of	O
TOPS-10	B-Operating_System
was	O
7.04	O
in	O
1988	O
.	O
</s>
<s>
Hobbyists	O
are	O
now	O
entitled	O
to	O
set	O
up	O
and	O
use	O
TOPS-10	B-Operating_System
under	O
a	O
Hobbyist	O
's	O
License	O
.	O
</s>
<s>
The	O
easiest	O
way	O
for	O
the	O
hobbyist	O
to	O
run	O
TOPS-10	B-Operating_System
is	O
to	O
acquire	O
a	O
suitable	O
emulator	B-Application
and	O
an	O
operating	B-General_Concept
system	I-General_Concept
image	O
.	O
</s>
<s>
TOPS-10	B-Operating_System
may	O
also	O
be	O
generated	O
from	O
archived	O
original	O
distribution	O
"	O
tapes	O
"	O
.	O
</s>
<s>
Paul	O
Allen	O
maintained	O
several	O
publicly	O
accessible	O
historic	O
computer	O
systems	O
,	O
including	O
a	O
DECsystem-2065	O
running	O
TOPS-10	B-Operating_System
.	O
</s>
<s>
The	O
TOPS-10	B-Operating_System
assembler	O
,	O
MACRO-10	B-Language
,	O
was	O
bundled	O
with	O
the	O
TOPS-10	B-Operating_System
distribution	O
.	O
</s>
<s>
The	O
following	O
programming	O
languages	O
were	O
implemented	O
on	O
TOPS-10	B-Operating_System
as	O
layered	O
products	O
:	O
</s>
<s>
The	O
following	O
programming	O
languages	O
were	O
implemented	O
on	O
TOPS-10	B-Operating_System
as	O
contributions	O
from	O
DECUS	O
members	O
:	O
</s>
<s>
The	O
following	O
major	O
user	O
utilities	O
were	O
implemented	O
on	O
TOPS-10	B-Operating_System
:	O
</s>
<s>
MS-DOS	B-Application
was	O
heavily	O
influenced	O
by	O
TOPS-10	B-Operating_System
.	O
</s>
