<s>
Clascal	B-Language
is	O
an	O
object-oriented	B-Language
programming	I-Language
language	I-Language
(	O
and	O
associated	O
discontinued	O
compiler	B-Language
)	O
developed	O
in	O
1983	O
by	O
the	O
Personal	O
Office	O
Systems	O
(	O
POS	O
)	O
division	O
(	O
later	O
renamed	O
The	O
Lisa	B-Device
Division	O
,	O
then	O
later	O
The	O
32-Bit	O
Systems	O
Division	O
)	O
of	O
Apple	O
Computer	O
.	O
</s>
<s>
Clascal	B-Language
was	O
used	O
to	O
program	O
applications	O
for	O
the	O
Lisa	B-Device
Office	I-Device
System	I-Device
,	O
the	O
operating	O
environment	O
of	O
the	O
Lisa	B-Device
.	O
</s>
<s>
According	O
to	O
Larry	O
Tesler	O
,	O
this	O
was	O
developed	O
as	O
a	O
replacement	O
for	O
their	O
version	O
of	O
Smalltalk	B-Application
that	O
was	O
too	O
slow	O
.	O
</s>
<s>
It	O
was	O
an	O
extension	O
of	O
Lisa	B-Device
Pascal	B-Application
,	O
which	O
in	O
turn	O
harked	O
back	O
to	O
the	O
UCSD	B-Language
Pascal	I-Language
model	O
originally	O
implemented	O
on	O
the	O
Apple	B-Device
II	I-Device
.	O
</s>
<s>
It	O
was	O
strongly	O
influenced	O
by	O
the	O
Xerox	O
Palo	O
Alto	O
Research	O
Center	O
(	O
PARC	O
)	O
release	O
of	O
Smalltalk-80	B-Application
,	O
v1	O
(	O
which	O
had	O
been	O
formerly	O
ported	O
to	O
the	O
Lisa	B-Device
)	O
,	O
and	O
by	O
Modula	B-Language
.	O
</s>
<s>
Clascal	B-Language
was	O
the	O
base	O
for	O
Object	B-Language
Pascal	I-Language
on	O
the	O
Apple	O
Macintosh	B-Device
in	O
1985	O
.	O
</s>
<s>
With	O
the	O
demise	O
of	O
the	O
Lisa	B-Device
in	O
1986	O
,	O
Pascal	B-Application
and	O
Object	B-Language
Pascal	I-Language
continued	O
to	O
be	O
used	O
in	O
the	O
Macintosh	B-Operating_System
Programmer	I-Operating_System
's	I-Operating_System
Workshop	I-Operating_System
for	O
systems	O
and	O
application	O
development	O
for	O
several	O
more	O
years	O
,	O
until	O
it	O
was	O
finally	O
supplanted	O
by	O
the	O
languages	O
C	B-Language
and	O
C++	B-Language
.	O
</s>
<s>
The	O
MacApp	B-Operating_System
application	O
framework	O
was	O
based	O
on	O
Toolkit	O
originally	O
written	O
in	O
Clascal	B-Language
.	O
</s>
<s>
Ultimately	O
Object	B-Language
Pascal	I-Language
evolved	O
into	O
the	O
language	O
of	O
Borland	B-Language
Delphi	I-Language
.	O
</s>
