<s>
Modula-2	B-Language
+	I-Language
is	O
a	O
programming	O
language	O
descended	O
from	O
the	O
Modula-2	B-Language
language	I-Language
.	O
</s>
<s>
Modula-2	B-Language
+	I-Language
is	O
Modula-2	B-Language
with	O
exceptions	B-General_Concept
and	O
threads	B-Operating_System
.	O
</s>
<s>
Main	O
differences	O
with	O
Modula-2	B-Language
:	O
</s>
<s>
Modula-2	B-Language
+	I-Language
was	O
used	O
to	O
develop	O
Topaz	O
,	O
an	O
operating	B-General_Concept
system	I-General_Concept
for	O
the	O
SRC	O
DEC	B-Device
Firefly	I-Device
shared	B-Operating_System
memory	I-Operating_System
asymmetric	B-Operating_System
multiprocessing	I-Operating_System
workstation	B-Device
.	O
</s>
<s>
Most	O
Topaz	O
applications	O
were	O
written	O
in	O
Modula-2	B-Language
+	I-Language
,	O
which	O
grew	O
along	O
with	O
the	O
development	O
of	O
the	O
system	O
.	O
</s>
<s>
Also	O
to	O
build	O
a	O
programming	O
integrated	B-Application
development	I-Application
environment	I-Application
for	O
it	O
in	O
the	O
Acorn	O
Research	O
Center	O
(	O
ARC	O
)	O
.	O
</s>
<s>
Modula-2	B-Language
+	I-Language
strongly	O
influenced	O
other	O
languages	O
such	O
as	O
Modula-3	B-Language
,	O
but	O
as	O
of	O
2005	O
,	O
it	O
had	O
disappeared	O
.	O
</s>
<s>
The	O
original	O
developers	O
of	O
Modula-2	B-Language
+	I-Language
were	O
both	O
acquired	O
:	O
Acorn	O
by	O
Olivetti	O
and	O
Digital	O
Equipment	O
Corporation	O
by	O
Compaq	O
.	O
</s>
<s>
Olivetti	O
sold	O
the	O
Olivetti	O
Research	O
Center	O
and	O
Olivetti	O
Software	O
Technology	O
Laboratory	O
(	O
after	O
bought	O
Acorn	O
ARC	O
)	O
to	O
Oracle	B-Application
Corporation	I-Application
and	O
was	O
later	O
absorbed	O
by	O
AT&T	O
.	O
</s>
