<s>
Crobots	B-Application
is	O
a	O
programming	B-Language
game	I-Language
released	O
for	O
the	O
first	O
time	O
by	O
Tom	O
Poindexter	O
in	O
December	O
,	O
1985	O
as	O
Shareware	B-License
.	O
</s>
<s>
It	O
is	O
an	O
MS-DOS	B-Application
program	O
for	O
IBM	O
PC	O
and	O
compatibles	O
and	O
was	O
developed	O
on	O
x86-based	O
Unix	O
systems	O
.	O
</s>
<s>
The	O
robots	B-Algorithm
are	O
controlled	O
by	O
a	O
program	O
written	O
in	O
a	O
stripped-down	O
version	O
of	O
C	B-Language
.	O
The	O
robot	B-Algorithm
's	O
mission	O
is	O
to	O
seek	O
out	O
and	O
destroy	O
other	O
robots	B-Algorithm
,	O
each	O
running	O
different	O
programs	O
.	O
</s>
<s>
The	O
robots	B-Algorithm
can	O
be	O
controlled	O
in	O
order	O
to	O
move	O
around	O
the	O
battlefield	O
,	O
scan	O
the	O
environment	O
to	O
find	O
enemies	O
and	O
fire	O
at	O
enemies	O
using	O
a	O
cannon	O
.	O
</s>
<s>
Crobots	B-Application
borrows	O
the	O
concept	O
used	O
from	O
the	O
game	O
RobotWar	B-Device
that	O
ran	O
on	O
the	O
original	O
Apple	B-Device
II	I-Device
computer	O
.	O
</s>
<s>
Robots	B-Algorithm
were	O
programmed	O
in	O
a	O
proprietary	O
programming	O
language	O
that	O
was	O
interpreted	O
and	O
included	O
a	O
real-time	O
view	O
of	O
the	O
game	O
as	O
it	O
was	O
played	O
.	O
</s>
<s>
In	O
October	O
,	O
2013	O
,	O
Poindexter	O
released	O
the	O
source	O
code	O
of	O
Crobots	B-Application
under	O
the	O
GPLv2	O
free	B-Application
software	I-Application
license	B-License
.	O
</s>
<s>
There	O
have	O
been	O
many	O
Crobots	B-Application
clones	B-General_Concept
made	O
.	O
</s>
<s>
However	O
,	O
very	O
few	O
of	O
them	O
are	O
compiler	B-Language
and	O
virtual	B-Architecture
machine	I-Architecture
at	O
the	O
same	O
time	O
;	O
for	O
example	O
there	O
are	O
Java	B-Language
clones	B-General_Concept
that	O
use	O
JVM	B-Language
and	O
C++	B-Language
clones	B-General_Concept
that	O
use	O
a	O
standard	O
Microsoft	O
compiler	B-Language
.	O
</s>
<s>
Proper	O
clones	B-General_Concept
have	O
the	O
same	O
intrinsic	O
functions	O
as	O
the	O
original	O
Tom	O
Poindexter	O
version	O
;	O
sometimes	O
however	O
the	O
direction	O
of	O
angles	O
is	O
changed	O
to	O
match	O
the	O
standard	O
C	B-Language
library	O
's	O
trigonometric	O
functions	O
.	O
</s>
<s>
The	O
most	O
recent	O
clones	B-General_Concept
are	O
Crobots64	O
and	O
Netrobots	O
.	O
</s>
<s>
Crobots64	O
by	O
Marco	O
Zora	O
has	O
a	O
C++	B-Language
-subset	O
compiler	B-Language
and	O
a	O
virtual	B-Architecture
machine	I-Architecture
with	O
a	O
graphical	O
interface	O
.	O
</s>
<s>
New	O
capabilities	O
in	O
this	O
clone	B-General_Concept
are	O
cooperation	O
between	O
robots	B-Algorithm
of	O
the	O
same	O
species	O
,	O
the	O
unlimited	O
number	O
of	O
concurrent	O
robots	B-Algorithm
,	O
the	O
floating	O
point	O
math	O
functions	O
and	O
the	O
speed	O
of	O
the	O
virtual	O
CPU	O
.	O
</s>
<s>
In	O
contrast	O
,	O
Netrobots	O
can	O
run	O
over	O
a	O
network	O
with	O
each	O
robot	B-Algorithm
running	O
in	O
a	O
separate	O
process	O
,	O
and	O
each	O
robot	B-Algorithm
can	O
be	O
written	O
in	O
a	O
different	O
programming	O
language	O
.	O
</s>
