<s>
Virtual	B-Application
Pascal	I-Application
is	O
a	O
free	B-License
32-bit	O
Pascal	B-Application
compiler	B-Language
,	O
IDE	B-Application
,	O
and	O
debugger	B-Application
for	O
OS/2	B-Application
and	O
Microsoft	B-Application
Windows	I-Application
,	O
with	O
some	O
limited	O
Linux	B-Application
support	O
.	O
</s>
<s>
Virtual	B-Application
Pascal	I-Application
was	O
developed	O
by	O
Vitaly	O
Miryanov	O
and	O
later	O
maintained	O
by	O
Allan	O
Mertner	O
.	O
</s>
<s>
The	O
compiler	B-Language
is	O
compatible	O
with	O
Turbo	B-Application
Pascal	I-Application
,	O
Borland	B-Language
Delphi	I-Language
,	O
and	O
Free	B-Operating_System
Pascal	I-Operating_System
,	O
although	O
language	O
-	O
and	O
RTL-compatibility	O
is	O
limited	O
for	O
features	O
introduced	O
after	O
Delphi	B-Language
v2	O
and	O
FPC	O
1.0.x	O
.	O
</s>
<s>
Significant	O
features	O
of	O
Virtual	B-Application
Pascal	I-Application
include	O
:	O
</s>
<s>
The	O
compiler	B-Language
was	O
quite	O
popular	O
in	O
the	O
BBS	B-Application
scene	O
,	O
probably	O
because	O
of	O
its	O
OS/2	B-Application
port	O
and	O
being	O
one	O
of	O
the	O
few	O
affordable	O
multi-target	O
compilers	B-Language
.	O
</s>
<s>
Also	O
Turbo	B-Application
Pascal	I-Application
had	O
been	O
popular	O
in	O
the	O
BBS	B-Application
scene	O
too	O
,	O
but	O
its	O
successor	O
,	O
Delphi	B-Language
was	O
suddenly	O
for	O
Windows	B-Application
only	O
.	O
</s>
<s>
Virtual	B-Application
Pascal	I-Application
provided	O
a	O
migration	O
path	O
for	O
existing	O
codebases	O
.	O
</s>
<s>
There	O
has	O
been	O
pressure	O
from	O
some	O
users	O
for	O
Virtual	B-Application
Pascal	I-Application
to	O
be	O
made	O
into	O
open-source	O
software	O
.	O
</s>
<s>
The	O
compiler	B-Language
source	O
is	O
mostly	O
written	O
in	O
Intel	O
assembly	O
which	O
is	O
hard	O
to	O
change	O
and	O
maintain	O
.	O
</s>
<s>
Part	O
of	O
the	O
run-time	B-Library
library	I-Library
is	O
proprietary	O
to	O
Borland	O
(	O
The	O
FreePascal	B-Operating_System
run-time	B-Library
library	I-Library
was	O
ported	O
to	O
VirtualPascal	O
by	O
Noah	O
Silva	O
,	O
however	O
newer	O
versions	O
of	O
the	O
FreePascalRTL	O
use	O
features	O
of	O
the	O
FreePascal	B-Operating_System
compiler	B-Language
which	O
are	O
not	O
supported	O
by	O
VirtualPascal	O
,	O
and	O
so	O
can	O
not	O
be	O
ported	O
)	O
.	O
</s>
<s>
The	O
patch/diff	O
tool	O
to	O
work	O
around	O
the	O
above	O
(	O
provide	O
changes	O
to	O
proprietary	O
without	O
distributing	O
parts	O
of	O
the	O
original	O
)	O
was	O
proprietary	O
and	O
(	O
Windows	B-Application
)	O
16bit	O
only	O
.	O
</s>
<s>
On	O
4Apr	O
2005	O
,	O
Virtual	B-Application
Pascal	I-Application
was	O
announced	O
'	O
dead	O
 '	O
on	O
the	O
official	O
site	O
.	O
</s>
<s>
Run-Time	B-Library
Library	I-Library
to	O
32bit	O
DPMI	O
.	O
</s>
