<s>
Dungeons	B-Application
of	I-Application
Daggorath	I-Application
is	O
one	O
of	O
the	O
first	O
real-time	O
,	O
first-person	O
perspective	O
role-playing	O
video	O
games	O
.	O
</s>
<s>
It	O
was	O
produced	O
by	O
DynaMicro	O
for	O
the	O
TRS-80	B-Device
Color	I-Device
Computer	I-Device
in	O
1983	O
.	O
</s>
<s>
A	O
sequel	O
,	O
Castle	B-Application
of	I-Application
Tharoggad	I-Application
,	O
was	O
released	O
in	O
1988	O
.	O
</s>
<s>
Dungeons	B-Application
of	I-Application
Daggorath	I-Application
was	O
one	O
of	O
the	O
first	O
games	O
that	O
attempted	O
to	O
portray	O
three-dimensional	O
space	O
in	O
a	O
real-time	O
environment	O
,	O
using	O
angled	O
lines	O
to	O
give	O
the	O
illusion	O
of	O
depth	O
.	O
</s>
<s>
It	O
followed	O
the	O
1974	O
games	O
Maze	B-Application
War	I-Application
and	O
Spasim	B-Application
,	O
written	O
for	O
research	O
computers	O
,	O
and	O
the	O
first	O
3D	O
maze	B-Application
game	O
for	O
home	O
computers	O
,	O
3D	B-Application
Monster	I-Application
Maze	I-Application
,	O
released	O
in	O
1981	O
.	O
</s>
<s>
The	O
game	O
Phantom	B-Application
Slayer	I-Application
,	O
which	O
was	O
released	O
in	O
1982	B-Application
for	O
the	O
Color	B-Device
Computer	I-Device
,	O
also	O
featured	O
monsters	O
lurking	O
in	O
a	O
maze	B-Application
.	O
</s>
<s>
While	O
Daggorath	B-Application
was	O
visually	O
similar	O
to	O
these	O
games	O
,	O
it	O
added	O
several	O
elements	O
of	O
strategy	O
,	O
such	O
as	O
different	O
kinds	O
of	O
monsters	O
,	O
complex	O
mazes	B-Application
,	O
different	O
levels	O
of	O
visibility	O
,	O
and	O
the	O
use	O
of	O
different	O
objects	O
and	O
weapons	O
.	O
</s>
<s>
This	O
heartbeat	O
system	O
was	O
used	O
instead	O
of	O
numerical	O
statistics	O
such	O
as	O
hit	O
points	O
or	O
vitality	O
,	O
and	O
was	O
inspired	O
by	O
arcade	O
games	O
,	O
specifically	O
1978	O
's	O
Space	B-Application
Invaders	I-Application
where	O
a	O
heartbeat-like	O
sound	O
gradually	O
increases	O
pace	O
as	O
enemies	O
advance	O
towards	O
the	O
player	O
.	O
</s>
<s>
The	O
game	O
was	O
developed	O
by	O
Douglas	O
J	O
.	O
Morgan	O
and	O
Keith	O
S	O
.	O
Kiyohara	O
,	O
with	O
sounds	O
by	O
Phil	O
Landmeier	O
,	O
in	O
1980	O
–	O
81	O
for	O
the	O
Tandy	O
(	O
RadioShack	O
)	O
TRS-80	B-Device
Color	I-Device
Computer	I-Device
.	O
</s>
<s>
Produced	O
by	O
DynaMicro	O
,	O
it	O
was	O
released	O
in	O
1983	O
as	O
an	O
eight	O
kilobyte	O
ROMpak	O
cartridge	B-Protocol
for	O
the	O
Color	B-Device
Computer	I-Device
,	O
which	O
took	O
several	O
months	O
of	O
recoding	O
to	O
achieve	O
.	O
</s>
<s>
Despite	O
this	O
,	O
the	O
game	O
features	O
a	O
multi-level	O
maze	B-Application
and	O
has	O
what	O
for	O
the	O
time	O
were	O
advanced	O
sound	O
effects	O
that	O
provide	O
important	O
clues	O
to	O
the	O
locations	O
of	O
monsters	O
.	O
</s>
<s>
After	O
Dungeons	B-Application
of	I-Application
Daggorath	I-Application
became	O
one	O
of	O
the	O
most	O
popular	O
Color	B-Device
Computer	I-Device
games	O
,	O
Tandy	O
produced	O
a	O
sequel	O
,	O
Castle	B-Application
of	I-Application
Tharoggad	I-Application
,	O
in	O
1988	O
which	O
was	O
made	O
without	O
the	O
participation	O
of	O
the	O
Daggorath	B-Application
team	O
.	O
</s>
<s>
He	O
released	O
the	O
game	O
under	O
a	O
freeware-like	O
license	O
to	O
the	O
public	O
,	O
also	O
offering	O
the	O
source	O
code	O
for	O
a	O
small	O
fee	O
.	O
</s>
<s>
It	O
has	O
been	O
ported	O
by	O
fans	O
to	O
Microsoft	B-Application
Windows	I-Application
,	O
Linux	B-Application
,	O
RISC	B-Operating_System
OS	I-Operating_System
and	O
PSP	B-Operating_System
via	O
the	O
SDL	B-Operating_System
library	I-Operating_System
.	O
</s>
<s>
Dungeons	B-Application
of	I-Application
Daggorath	I-Application
was	O
featured	O
in	O
the	O
book	O
Ready	O
Player	O
One	O
,	O
where	O
the	O
protagonist	O
has	O
to	O
solve	O
the	O
game	O
,	O
emulated	O
within	O
a	O
simulated	O
universe	O
.	O
</s>
