<s>
The	O
Gravis	B-Device
PC	I-Device
GamePad	I-Device
is	O
a	O
game	B-Protocol
port	I-Protocol
game	B-Device
controller	I-Device
produced	O
by	O
Advanced	O
Gravis	O
Computer	O
Technology	O
first	O
released	O
in	O
1991	O
.	O
</s>
<s>
It	O
was	O
the	O
first	O
gamepad	B-Device
for	O
the	O
IBM	O
PC	O
compatible	O
in	O
a	O
market	O
then	O
dominated	O
by	O
joysticks	B-Device
.	O
</s>
<s>
Included	O
with	O
the	O
gamepad	B-Device
was	O
a	O
shareware	B-License
Commander	B-Application
Keen	I-Application
game	O
,	O
episode	O
1	O
,	O
Marooned	O
on	O
Mars	O
,	O
which	O
was	O
later	O
replaced	O
with	O
the	O
shareware	B-License
episode	O
4	O
,	O
Secret	O
of	O
the	O
Oracle	O
which	O
supported	O
all	O
4	O
buttons	O
.	O
</s>
<s>
The	O
gamepad	B-Device
is	O
no	O
longer	O
manufactured	O
,	O
as	O
Gravis	O
was	O
acquired	O
in	O
1997	O
by	O
Kensington	O
Computer	O
Products	O
Group	O
.	O
</s>
<s>
The	O
gamepad	B-Device
's	O
design	O
is	O
similar	O
to	O
that	O
of	O
the	O
stock	O
SNES	O
controller	O
(	O
more	O
so	O
the	O
Japanese	O
and	O
European	O
version	O
with	O
colored	O
buttons	O
)	O
,	O
although	O
it	O
lacks	O
the	O
Start	O
,	O
Select	O
and	O
shoulder	O
buttons	O
,	O
and	O
the	O
shape	O
of	O
the	O
controller	O
's	O
chassis	O
differs	O
slightly	O
,	O
with	O
an	O
inverted	O
curve	O
on	O
the	O
left	O
side	O
.	O
</s>
<s>
As	O
originally	O
found	O
in	O
some	O
versions	O
of	O
the	O
Sega	O
Master	O
System	O
controller	O
,	O
the	O
center	O
of	O
the	O
Gravis	B-Device
GamePad	I-Device
's	O
d-pad	B-Device
allows	O
a	O
small	O
joystick	B-Device
to	O
be	O
inserted	O
.	O
</s>
<s>
Both	O
at	O
the	O
top	O
and	O
bottom	O
of	O
the	O
gamepad	B-Device
are	O
switches	O
.	O
</s>
<s>
This	O
gave	O
all	O
four	O
buttons	O
functionality	O
even	O
in	O
PC	O
games	O
that	O
only	O
supported	O
two	O
buttons	O
on	O
joysticks	B-Device
or	O
for	O
scenarios	O
when	O
two	O
gamepads	B-Device
are	O
connected	O
with	O
a	O
Y-splitter	O
.	O
</s>
<s>
The	O
other	O
allows	O
for	O
left-handed	O
operation	O
by	O
turning	O
the	O
workings	O
of	O
the	O
D-pad	B-Device
and	O
buttons	O
upside	O
down	O
.	O
</s>
<s>
For	O
PC	O
,	O
two	O
followup	O
variations	O
were	O
made	O
,	O
called	O
the	O
GamePad	B-Device
Pro	O
,	O
and	O
GamePad	B-Device
Pro	O
USB	B-Protocol
,	O
which	O
resemble	O
the	O
original	O
PlayStation	B-Device
Controller	I-Device
,	O
with	O
the	O
addition	O
of	O
four	O
shoulder	O
buttons	O
,	O
as	O
well	O
as	O
Select	O
and	O
Start	O
buttons	O
.	O
</s>
<s>
The	O
GamePad	B-Device
Pro	O
utilized	O
the	O
'	O
button	O
 '	O
signal	O
lines	O
on	O
an	O
analog	O
PC	O
joystick	B-Protocol
port	I-Protocol
to	O
send	O
digital	O
signals	O
(	O
referred	O
to	O
as	O
"	O
GrIP	O
"	O
)	O
to	O
allow	O
for	O
both	O
the	O
use	O
of	O
ten	O
buttons	O
and	O
the	O
simultaneous	O
use	O
of	O
up	O
to	O
four	O
controllers	O
connected	O
by	O
the	O
controller	O
's	O
built-in	O
piggyback	O
plug	O
.	O
</s>
<s>
A	O
switch	O
on	O
the	O
pack	O
of	O
the	O
non-USB	O
pad	O
could	O
be	O
used	O
to	O
allow	O
the	O
pad	O
to	O
function	O
as	O
a	O
standard	O
analog	O
four-button	O
pad	O
;	O
otherwise	O
,	O
games	O
could	O
not	O
detect	O
the	O
gamepad	B-Device
unless	O
they	O
were	O
coded	O
with	O
the	O
device	O
in	O
mind	O
(	O
DOS	O
)	O
or	O
a	O
specific	O
driver	O
was	O
installed	O
(	O
Windows	O
)	O
.	O
</s>
<s>
The	O
latter	O
uses	O
the	O
USB	B-Protocol
port	I-Protocol
and	O
the	O
USB	B-Protocol
Human	O
Interface	O
Device	O
class	O
standards	O
,	O
and	O
is	O
not	O
intended	O
for	O
DOS	O
use	O
.	O
</s>
<s>
Gravis	O
launched	O
other	O
series	O
of	O
gamepads	B-Device
for	O
the	O
Mac	B-Device
,	O
the	O
Amiga	B-Device
,	O
and	O
Atari	B-Device
ST	I-Device
as	O
well	O
.	O
</s>
<s>
The	O
Philips	B-Device
CD-i	I-Device
interactive	O
multimedia	O
CD	O
player	O
features	O
a	O
wired	O
controller	O
that	O
is	O
basically	O
the	O
original	O
Gravis	B-Device
PC	I-Device
GamePad	I-Device
in	O
a	O
monochrome	O
,	O
grey	O
color	O
scheme	O
.	O
</s>
<s>
According	O
to	O
Next	O
Generation	O
,	O
"	O
The	O
Gravis	O
Game	B-Device
Pad	I-Device
,	O
one	O
of	O
the	O
first	O
and	O
probably	O
the	O
best	O
PC	O
game	B-Device
pad	I-Device
,	O
has	O
enjoyed	O
steady	O
sales	O
for	O
several	O
years.	O
"	O
</s>
<s>
One	O
icon	O
from	O
the	O
Nuvola	B-Language
icon	O
set	O
resembles	O
the	O
GamePad	B-Device
.	O
</s>
<s>
The	O
GamePad	B-Device
was	O
also	O
the	O
official	O
gamepad	B-Device
of	O
Jazz	B-Application
Jackrabbit	I-Application
,	O
as	O
noted	O
in	O
the	O
shareware	B-License
demo	O
version	O
of	O
the	O
game	O
.	O
</s>
<s>
The	O
gamepad	B-Device
appears	O
in	O
the	O
game	O
as	O
a	O
power-up	O
,	O
and	O
as	O
an	O
advertisement	O
in	O
the	O
background	O
,	O
which	O
reads	O
"	O
All	O
kids	O
love	O
Gravis	B-Device
GamePad	I-Device
"	O
.	O
</s>
