<s>
PROLITH	B-Algorithm
(	O
abbreviated	O
from	O
Positive	O
Resist	O
Optical	B-Algorithm
LITHography	I-Algorithm
)	O
is	O
a	O
computer	B-Application
simulator	I-Application
modeling	O
the	O
optical	O
and	O
chemical	O
aspects	O
of	O
photolithography	B-Algorithm
.	O
</s>
<s>
Chris	O
Mack	O
started	O
developing	O
PROLITH	B-Algorithm
after	O
he	O
began	O
working	O
in	O
the	O
field	O
of	O
photolithography	B-Algorithm
at	O
the	O
NSA	O
in	O
1983	O
.	O
</s>
<s>
PROLITH	B-Algorithm
was	O
first	O
developed	O
on	O
an	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
Originally	O
PROLITH	B-Algorithm
was	O
given	O
away	O
for	O
free	O
,	O
while	O
NSA	O
was	O
paying	O
Chris	O
Mack	O
's	O
salary	O
.	O
</s>
<s>
In	O
1990	O
he	O
founded	O
FINLE	O
Technologies	O
to	O
commercialize	O
PROLITH	B-Algorithm
.	O
</s>
<s>
The	O
first	O
commercial	O
version	O
of	O
the	O
software	O
,	O
named	O
PROLITH/2	O
,	O
was	O
released	O
in	O
June	O
of	O
that	O
year	O
.	O
</s>
<s>
PROLITH	B-Algorithm
was	O
made	O
easier	O
to	O
use	O
and	O
it	O
grew	O
to	O
include	O
many	O
more	O
aspects	O
of	O
lithography	O
simulation	O
.	O
</s>
<s>
FINLE	O
Technologies	O
was	O
purchased	O
in	O
February	O
2000	O
by	O
KLA-Tencor	O
,	O
which	O
now	O
markets	O
PROLITH	B-Algorithm
.	O
</s>
