<s>
Dog	B-Application
Star	I-Application
Adventure	I-Application
is	O
a	O
text	O
adventure	B-Application
game	O
written	O
by	O
Lance	O
Micklus	O
in	O
TRS-80	B-Device
BASIC	B-Language
and	O
published	O
as	O
the	O
cover	O
article	O
in	O
the	O
May	O
1979	B-Application
issue	O
of	O
SoftSide	O
magazine	O
.	O
</s>
<s>
It	O
is	O
historically	O
notable	O
as	O
the	O
first	O
example	O
of	O
the	O
source	O
code	O
to	O
a	O
text	O
adventure	B-Application
being	O
published	O
,	O
and	O
as	O
a	O
result	O
,	O
many	O
later	O
text	O
adventures	B-Application
are	O
based	O
on	O
its	O
concepts	O
.	O
</s>
<s>
The	O
game	O
takes	O
place	O
in	O
the	O
Star	B-Application
Wars	I-Application
universe	O
,	O
loosely	O
following	O
the	O
plot	O
of	O
the	O
movie	O
during	O
the	O
action	O
that	O
takes	O
place	O
on	O
the	O
Death	B-Operating_System
Star	I-Operating_System
.	O
</s>
<s>
The	O
game	O
was	O
simultaneously	O
released	O
on	O
cassette	B-Device
tape	I-Device
by	O
SoftSide	O
publishing	O
spin-off	O
,	O
The	O
Software	O
Exchange	O
.	O
</s>
<s>
A	O
port	O
to	O
the	O
Commodore	B-Device
PET	I-Device
was	O
made	O
by	O
David	O
Malmberg	O
in	O
1980	O
,	O
with	O
most	O
of	O
the	O
names	O
returned	O
to	O
their	O
Star	B-Application
Wars	I-Application
versions	O
.	O
</s>
<s>
The	O
original	O
source	O
was	O
republished	O
in	O
The	O
Captain	O
80	O
Book	O
of	O
BASIC	B-Language
Adventures	B-Application
in	O
1981	O
,	O
and	O
again	O
in	O
the	O
June	O
1982	O
issue	O
of	O
Computer	O
and	O
Video	O
Games	O
.	O
</s>
<s>
It	O
was	O
also	O
sold	O
by	O
Adventure	B-Application
International	O
under	O
the	O
name	O
Death	O
Planet	O
:	O
The	O
Dog	B-Application
Star	I-Application
Adventure	I-Application
.	O
</s>
<s>
The	O
game	O
had	O
a	O
number	O
of	O
additions	O
to	O
the	O
basic	B-Language
two-word	O
model	O
.	O
</s>
<s>
Finally	O
,	O
the	O
game	O
also	O
included	O
a	O
feature	O
from	O
the	O
classic	O
Hunt	B-Application
the	I-Application
Wumpus	I-Application
:	O
in	O
certain	O
locations	O
the	O
game	O
would	O
tell	O
the	O
user	O
about	O
nearby	O
sounds	O
,	O
which	O
the	O
player	O
had	O
to	O
use	O
to	O
avoid	O
dangerous	O
encounters	O
.	O
</s>
<s>
Micklus	O
had	O
written	O
several	O
commercial	O
programs	O
before	O
Dog	O
Star	O
,	O
mostly	O
for	O
the	O
TRS-80	B-Device
.	O
</s>
<s>
Micklus	O
credits	O
the	O
original	O
Colossal	B-Application
Cave	I-Application
Adventure	I-Application
for	O
inspiring	O
him	O
to	O
write	O
Dog	O
Star	O
.	O
</s>
<s>
Adventure	B-Application
was	O
written	O
in	O
FORTRAN	B-Application
on	O
the	O
PDP-10	B-Device
,	O
a	O
system	O
with	O
considerably	O
more	O
memory	O
than	O
early	O
microcomputers	B-Architecture
.	O
</s>
<s>
The	O
work	O
creating	O
Dog	O
Star	O
was	O
primarily	O
an	O
effort	O
porting	O
these	O
basic	B-Language
concepts	O
to	O
BASIC	B-Language
while	O
keeping	O
within	O
the	O
small	O
amount	O
of	O
available	O
memory	O
.	O
</s>
<s>
Dog	O
Star	O
was	O
written	O
in	O
the	O
very	O
limited	O
TRS-80	B-Language
Level	I-Language
I	I-Language
BASIC	I-Language
,	O
so	O
many	O
of	O
the	O
techniques	O
used	O
in	O
the	O
game	O
were	O
easily	O
adapted	O
to	O
other	O
dialects	O
of	O
BASIC	B-Language
.	O
</s>
<s>
Since	O
Model	O
I	O
BASIC	B-Language
had	O
only	O
a	O
single	O
array	O
,	O
storing	O
all	O
of	O
the	O
required	O
data	O
required	O
some	O
clever	O
coding	O
.	O
</s>
<s>
The	O
basic	B-Language
idea	O
is	O
that	O
the	O
map	O
is	O
drawn	O
out	O
on	O
paper	O
and	O
each	O
location	O
on	O
it	O
,	O
or	O
"	O
room	O
"	O
,	O
is	O
assigned	O
a	O
number	O
.	O
</s>
<s>
This	O
means	O
there	O
are	O
26	O
=	O
64	O
possible	O
variations	O
,	O
which	O
can	O
be	O
represented	O
as	O
a	O
number	O
between	O
0	O
(	O
no	O
exits	O
)	O
and	O
63	O
(	O
all	O
exits	O
are	O
available	O
)	O
using	O
bit	B-Algorithm
manipulation	I-Algorithm
.	O
</s>
<s>
These	O
concepts	O
were	O
widely	O
copied	O
in	O
the	O
early	O
microcomputer	B-Architecture
field	O
,	O
and	O
can	O
be	O
found	O
almost	O
verbatim	O
in	O
many	O
other	O
adventures	B-Application
of	O
the	O
era	O
,	O
including	O
Survival	O
.	O
</s>
