<s>
pedit5	B-Application
,	O
alternately	O
called	O
The	O
Dungeon	B-Application
,	O
is	O
a	O
1975	O
dungeon	B-Application
crawl	O
role-playing	O
video	O
game	O
developed	O
for	O
the	O
University	O
of	O
Illinois	O
Urbana-Champaign	O
'	O
s	O
PLATO	B-Operating_System
computer	I-Operating_System
network	O
by	O
Rusty	O
Rutherford	O
.	O
</s>
<s>
In	O
it	O
,	O
the	O
player	O
controls	O
a	O
character	O
exploring	O
a	O
fixed	O
,	O
single-level	O
dungeon	B-Application
containing	O
randomly-generated	O
monster	O
encounters	O
and	O
treasure	O
.	O
</s>
<s>
When	O
they	O
encounter	O
a	O
monster	O
,	O
they	O
can	O
fight	O
the	O
monster	O
with	O
a	O
weapon	O
or	O
spells	B-Application
,	O
or	O
attempt	O
to	O
flee	O
.	O
</s>
<s>
Rutherford	O
developed	O
the	O
game	O
over	O
four	O
to	O
six	O
weeks	O
in	O
late	O
1975	O
as	O
a	O
computerized	O
take	O
on	O
the	O
Dungeons	B-Application
&	O
Dragons	O
role-playing	O
game	O
;	O
it	O
was	O
named	O
pedit5	B-Application
as	O
it	O
was	O
stored	O
in	O
the	O
fifth	O
"	O
pedit	O
"	O
slot	O
his	O
school	O
group	O
had	O
available	O
.	O
</s>
<s>
It	O
is	O
considered	O
to	O
be	O
the	O
first	O
example	O
of	O
a	O
dungeon	B-Application
crawl	O
video	O
game	O
and	O
one	O
of	O
the	O
first	O
computer	O
role-playing	O
games	O
.	O
</s>
<s>
An	O
improved	O
version	O
was	O
later	O
created	O
on	O
the	O
PLATO	B-Operating_System
network	I-Operating_System
as	O
orthanc	O
.	O
</s>
<s>
pedit5	B-Application
is	O
a	O
dungeon	B-Application
crawl	O
role-playing	O
video	O
game	O
,	O
in	O
which	O
the	O
player	O
guides	O
a	O
character	O
who	O
wanders	O
a	O
single-level	O
dungeon	B-Application
accumulating	O
treasure	O
and	O
killing	O
monsters	O
.	O
</s>
<s>
When	O
a	O
player	O
encounters	O
a	O
monster	O
,	O
they	O
can	O
use	O
one	O
of	O
several	O
spells	B-Application
.	O
</s>
<s>
The	O
dungeon	B-Application
is	O
rendered	O
in	O
a	O
two-dimensional	O
overhead	O
view	O
using	O
on-screen	O
character	O
graphics	O
,	O
and	O
controlled	O
via	O
keyboard	O
commands	O
.	O
</s>
<s>
The	O
dungeon	B-Application
has	O
a	O
fixed	O
layout	O
,	O
but	O
the	O
monster	O
encounters	O
and	O
treasure	O
are	O
randomly	O
generated	O
.	O
</s>
<s>
When	O
the	O
player	O
encounters	O
a	O
monster	O
,	O
they	O
can	O
choose	O
to	O
fight	O
,	O
cast	O
a	O
spell	B-Application
,	O
or	O
run	O
;	O
if	O
the	O
player	O
does	O
not	O
immediately	O
defeat	O
or	O
flee	O
the	O
monster	O
,	O
the	O
player-character	O
and	O
monster	O
fight	O
to	O
the	O
death	O
in	O
a	O
battle	O
controlled	O
by	O
the	O
game	O
without	O
further	O
player	O
input	O
.	O
</s>
<s>
The	O
game	O
was	O
developed	O
by	O
Rusty	O
Rutherford	O
over	O
four	O
to	O
six	O
weeks	O
in	O
late	O
1975	O
for	O
the	O
University	O
of	O
Illinois	O
Urbana-Champaign	O
'	O
s	O
PLATO	B-Operating_System
computer	I-Operating_System
network	O
,	O
which	O
by	O
the	O
1970s	O
supported	O
several	O
thousand	O
graphical	B-Application
terminals	I-Application
distributed	O
worldwide	O
,	O
running	O
processes	O
on	O
nearly	O
a	O
dozen	O
different	O
networked	O
mainframe	B-Architecture
computers	I-Architecture
.	O
</s>
<s>
Rutherford	O
had	O
been	O
playing	O
the	O
role-playing	O
game	O
Dungeons	B-Application
&	O
Dragons	O
since	O
earlier	O
in	O
the	O
year	O
,	O
and	O
wanted	O
to	O
create	O
a	O
video	O
game	O
based	O
on	O
the	O
concept	O
.	O
</s>
<s>
He	O
knew	O
of	O
another	O
game	O
based	O
on	O
the	O
same	O
concept	O
that	O
was	O
under	O
development	O
in	O
the	O
PLATO	B-Operating_System
system	I-Operating_System
,	O
under	O
the	O
title	O
dnd	B-Application
,	O
but	O
as	O
it	O
had	O
not	O
yet	O
been	O
finished	O
he	O
wanted	O
to	O
start	O
on	O
his	O
own	O
version	O
.	O
</s>
<s>
As	O
the	O
dnd	B-Application
project	O
had	O
promised	O
to	O
be	O
a	O
multiplayer	O
game	O
but	O
had	O
not	O
yet	O
been	O
able	O
to	O
deliver	O
the	O
feature	O
—	O
nor	O
would	O
it	O
—	O
he	O
set	O
out	O
to	O
create	O
a	O
single-player	O
game	O
.	O
</s>
<s>
Rutherford	O
tried	O
to	O
use	O
Dungeons	B-Application
&	O
Dragons	O
concepts	O
as	O
much	O
as	O
possible	O
,	O
including	O
hit	O
points	O
,	O
levels	O
,	O
and	O
experience	O
and	O
treasure	O
rewards	O
for	O
defeating	O
monsters	O
.	O
</s>
<s>
The	O
limitations	O
of	O
the	O
system	O
required	O
Rutherford	O
to	O
compromise	O
on	O
size	O
;	O
the	O
dungeon	B-Application
was	O
limited	O
to	O
40-50	O
rooms	O
on	O
a	O
single	O
level	O
,	O
and	O
the	O
game	O
could	O
only	O
store	O
20	O
players	O
at	O
a	O
time	O
,	O
which	O
Rutherford	O
later	O
said	O
was	O
a	O
large	O
problem	O
when	O
the	O
game	O
became	O
popular	O
.	O
</s>
<s>
The	O
game	O
was	O
named	O
pedit5	B-Application
as	O
Rusty	O
Rutherford	O
was	O
a	O
member	O
of	O
the	O
Population	O
and	O
Energy	O
Group	O
at	O
University	O
of	O
Illinois	O
,	O
Urbana-Champaign	O
;	O
each	O
group	O
was	O
assigned	O
a	O
limited	O
number	O
of	O
program	O
slots	O
on	O
the	O
school	O
's	O
mainframe	B-Architecture
,	O
with	O
the	O
Population	O
and	O
Energy	O
Group	O
having	O
program	O
slots	O
names	O
"	O
pedit1	O
"	O
through	O
"	O
pedit5	B-Application
"	O
.	O
</s>
<s>
Because	O
at	O
the	O
time	O
the	O
game	O
was	O
not	O
seen	O
to	O
be	O
an	O
appropriate	O
use	O
of	O
the	O
resources	O
by	O
system	O
administrators	O
pedit5	B-Application
was	O
eventually	O
deleted	O
,	O
but	O
Rutherford	O
continually	O
restored	O
it	O
.	O
</s>
<s>
pedit5	B-Application
was	O
one	O
of	O
the	O
first	O
computer	O
role-playing	O
games	O
;	O
pedit5	B-Application
,	O
dnd	B-Application
,	O
and	O
Dungeon	B-Application
were	O
all	O
created	O
around	O
the	O
same	O
time	O
in	O
1975	O
,	O
though	O
they	O
may	O
have	O
been	O
preceded	O
by	O
the	O
swiftly-deleted	O
m199h	O
in	O
1974	O
.	O
</s>
<s>
It	O
is	O
considered	O
to	O
be	O
the	O
first	O
example	O
of	O
a	O
dungeon	B-Application
crawl	O
game	O
.	O
</s>
<s>
The	O
original	O
version	O
of	O
pedit5	B-Application
was	O
resurrected	O
as	O
orthanc1	O
.	O
</s>
<s>
Both	O
orthanc	O
and	O
orthanc1	O
remained	O
on	O
the	O
PLATO	B-Operating_System
system	I-Operating_System
.	O
</s>
<s>
Since	O
then	O
,	O
copies	O
of	O
the	O
game	O
's	O
source	O
code	O
have	O
been	O
made	O
available	O
allowing	O
users	O
to	O
play	O
the	O
title	O
on	O
the	O
PLATO	B-Operating_System
(	O
Cybis	O
)	O
system	O
,	O
or	O
an	O
emulator	B-Application
of	O
it	O
,	O
connected	O
to	O
the	O
Internet	O
.	O
</s>
