<s>
VDMSound	B-Application
was	O
an	O
open-source	B-Application
(	O
licensed	O
under	O
GPLv2	O
)	O
emulator	B-Application
of	O
legacy	O
sound	B-Device
card	I-Device
devices	O
,	O
designed	O
to	O
allow	O
video	O
games	O
and	O
other	O
applications	O
written	O
for	O
MS-DOS	B-Application
to	O
run	O
on	O
the	O
Microsoft	B-Application
Windows	I-Application
NT/2000/XP/95/98/Me	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
VDMSound	B-Application
emulates	B-Application
Adlib	O
and	O
Sound	B-Application
Blaster	I-Application
cards	I-Application
(	O
standard	O
,	O
pro	O
and	O
16	O
)	O
,	O
parallel	B-Device
port	I-Device
DAC	O
,	O
and	O
an	O
MPU	O
401	O
MIDI	O
(	O
UART-mode	O
)	O
interface	O
.	O
</s>
<s>
It	O
also	O
provides	O
joystick	B-Device
support	O
.	O
</s>
<s>
The	O
official	O
VDMSound	B-Application
builds	O
runs	O
on	O
Windows	O
NT/2000/XP	O
.	O
</s>
<s>
VDMSound	B-Application
allows	O
the	O
recording	O
of	O
all	O
captured	O
sound	O
and	O
music	O
to	O
WAV	O
and	O
MID	O
files	O
.	O
</s>
<s>
VDMSound	B-Application
allows	O
the	O
user	O
to	O
provide	O
custom	O
mappings	O
for	O
MIDI	O
instruments	O
as	O
well	O
as	O
for	O
joystick	B-Device
buttons	O
and	O
axes	O
.	O
</s>
<s>
Joystick	B-Device
mappings	O
are	O
needed	O
principally	O
for	O
DOS-based	O
flight	B-Application
simulation	I-Application
applications	O
,	O
when	O
matching	O
yokes	O
,	O
throttles	O
and	O
pedals	O
to	O
the	O
simulator	O
's	O
expected	O
configuration	O
.	O
</s>
<s>
As	O
of	O
version	O
2.1.0	O
beta	O
,	O
VDMSound	B-Application
also	O
includes	O
a	O
Wizard	O
graphical	O
user	O
interface	O
(	O
integrated	O
as	O
a	O
Windows	O
shell	O
extension	O
)	O
,	O
accessible	O
by	O
right-clicking	O
on	O
any	O
MS-DOS	B-Application
executable	O
.	O
</s>
<s>
As	O
opposed	O
to	O
DOSBox	B-Application
,	O
which	O
emulates	B-Application
an	O
entire	O
x86	B-Operating_System
personal	O
computer	O
with	O
DOS	B-Device
,	O
VDMSound	B-Application
emulates	B-Application
only	O
the	O
sound	O
hardware	O
.	O
</s>
<s>
All	O
other	O
aspects	O
of	O
DOS	B-Device
emulation	B-Application
are	O
managed	O
natively	O
by	O
the	O
Windows	B-Application
operating	I-Application
system	I-Application
's	O
16-bit	O
subsystem	O
(	O
NTVDM	O
)	O
through	O
virtualization	B-General_Concept
.	O
</s>
<s>
This	O
results	O
in	O
reduced	O
system	O
load	O
(	O
and	O
thus	O
games	O
will	O
run	O
faster	O
than	O
under	O
DOSBox	B-Application
on	O
the	O
same	O
hardware	O
specifications	O
)	O
,	O
at	O
the	O
expense	O
of	O
reduced	O
compatibility	O
(	O
see	O
limitations	O
below	O
.	O
)	O
</s>
<s>
The	O
Windows	B-Application
operating	I-Application
system	I-Application
's	O
16-bit	O
subsystem	O
is	O
lacking	O
in	O
several	O
areas	O
which	O
directly	O
or	O
indirectly	O
affect	O
VDMSound	B-Application
emulation	B-Application
:	O
</s>
<s>
Improper	O
interrupt	O
emulation	B-Application
in	O
Windows	O
NT/2000	O
(	O
but	O
not	O
XP	O
)	O
results	O
in	O
some	O
games	O
hanging	O
when	O
they	O
communicate	O
with	O
the	O
emulated	B-Application
sound	B-Device
card	I-Device
(	O
requiring	O
patching	O
via	O
CLI2NOP	O
.	O
)	O
</s>
<s>
Improper	O
PIC	B-Architecture
emulation	B-Application
in	O
Windows	O
results	O
in	O
games	O
not	O
being	O
able	O
to	O
use	O
normal	O
(	O
or	O
intelligent	O
)	O
mode	O
,	O
limiting	O
VDMSound	B-Application
's	O
MPU-401	O
emulation	B-Application
support	O
to	O
UART-mode	O
only	O
.	O
</s>
<s>
DOSBox	B-Application
does	O
not	O
rely	O
on	O
the	O
Windows	O
16-bit	O
subsystem	O
and	O
is	O
thus	O
not	O
subject	O
to	O
these	O
limitations	O
.	O
</s>
<s>
VDMSound	B-Application
started	O
as	O
a	O
private	O
project	O
in	O
1998	O
,	O
in	O
Montreal	O
,	O
its	O
motivating	O
purpose	O
being	O
that	O
of	O
capturing	O
in-game	O
MIDI	O
music	O
through	O
software	O
while	O
taking	O
advantage	O
of	O
Windows	O
NT	O
's	O
16-bit	O
subsystem	O
virtualization	B-General_Concept
.	O
</s>
<s>
It	O
became	O
open-source	B-Application
and	O
moved	O
to	O
SourceForge	O
after	O
a	O
full	O
rewrite	O
in	O
the	O
early	O
spring	O
of	O
2001	O
.	O
</s>
<s>
It	O
was	O
discontinued	O
in	O
early	O
2004	O
(	O
last	O
checkin	O
occurred	O
on	O
2004-02-14	O
)	O
,	O
when	O
additional	O
improvements	O
in	O
emulation	B-Application
were	O
no	O
longer	O
possible	O
due	O
to	O
limitations	O
in	O
the	O
Windows	O
16-bit	O
subsystem	O
.	O
</s>
<s>
The	O
sound	O
emulation	B-Application
code	O
from	O
VDMSound	B-Application
has	O
since	O
been	O
integrated	O
into	O
DOSBox	B-Application
.	O
</s>
<s>
VDMSound	B-Application
was	O
not	O
compatible	O
with	O
Windows	B-Application
Vista	I-Application
,	O
making	O
the	O
project	O
obsolete	O
.	O
</s>
