<s>
The	O
or	O
CPS-2	B-Application
is	O
an	O
arcade	O
system	O
board	O
that	O
Capcom	O
first	O
used	O
in	O
1993	O
for	O
Super	B-Application
Street	I-Application
Fighter	I-Application
II	I-Application
.	O
</s>
<s>
It	O
was	O
the	O
successor	O
to	O
their	O
previous	O
CP	B-Application
System	I-Application
and	O
Capcom	O
Power	O
System	O
Changer	O
arcade	O
hardware	O
and	O
was	O
succeeded	O
by	O
the	O
CP	B-Application
System	I-Application
III	I-Application
hardware	O
in	O
1996	B-Application
,	O
of	O
which	O
the	O
CPS-2	B-Application
would	O
outlive	O
by	O
over	O
four	O
years	O
.	O
</s>
<s>
The	O
arcade	O
system	O
had	O
new	O
releases	O
for	O
it	O
until	O
the	O
end	O
of	O
2003	O
,	O
ending	O
with	O
Hyper	B-Application
Street	I-Application
Fighter	I-Application
II	I-Application
.	O
</s>
<s>
The	O
earlier	O
Capcom	O
system	O
board	O
,	O
the	O
original	O
CP	B-Application
System	I-Application
(	O
or	O
CPS-1	B-Application
)	O
,	O
while	O
successful	O
,	O
was	O
very	O
vulnerable	O
to	O
bootleggers	O
making	O
unauthorized	O
copies	O
of	O
games	O
.	O
</s>
<s>
In	O
order	O
to	O
rectify	O
the	O
situation	O
,	O
Capcom	O
took	O
the	O
CP	B-Application
System	I-Application
hardware	O
(	O
with	O
QSound	O
)	O
with	O
minimal	O
changes	O
and	O
employed	O
encryption	O
on	O
the	O
program	O
ROMs	O
to	O
prevent	O
software	O
piracy	O
.	O
</s>
<s>
Capcom	O
announced	O
the	O
development	O
of	O
the	O
CPS-2	B-Application
in	O
1990	O
.	O
</s>
<s>
They	O
had	O
planned	O
to	O
complete	O
and	O
release	O
the	O
CPS-2	B-Application
in	O
18	O
months	O
.	O
</s>
<s>
The	O
CP	B-Application
System	I-Application
II	I-Application
consists	O
of	O
two	O
separate	O
parts	O
;	O
the	O
A	O
board	O
,	O
which	O
connects	O
to	O
the	O
JAMMA	O
harness	O
and	O
contains	O
components	O
common	O
between	O
all	O
CP	B-Application
System	I-Application
II	I-Application
games	O
,	O
and	O
the	O
B	O
board	O
,	O
which	O
contains	O
the	O
game	O
itself	O
.	O
</s>
<s>
CP	B-Application
System	I-Application
II	I-Application
A	O
and	O
B	O
boards	O
are	O
color-coded	O
by	O
region	O
,	O
and	O
each	O
board	O
can	O
only	O
be	O
used	O
with	O
its	O
same-colored	O
mate	O
.	O
</s>
<s>
As	O
time	O
passes	O
,	O
these	O
batteries	O
lose	O
their	O
charge	O
and	O
the	O
games	O
stop	O
functioning	O
,	O
because	O
the	O
CPU	B-General_Concept
cannot	O
execute	O
any	O
code	O
without	O
the	O
decryption	O
keys	O
.	O
</s>
<s>
Due	O
to	O
the	O
heavy	O
encryption	O
,	O
it	O
was	O
believed	O
for	O
a	O
long	O
time	O
that	O
CP	B-Application
System	I-Application
II	I-Application
emulation	O
was	O
next	O
to	O
impossible	O
.	O
</s>
<s>
However	O
,	O
in	O
January	O
2001	O
,	O
the	O
CPS-2	B-Application
Shock	O
group	O
was	O
able	O
to	O
obtain	O
unencrypted	O
program	O
data	O
by	O
hacking	O
into	O
the	O
hardware	O
,	O
which	O
they	O
distributed	O
as	O
XOR	B-Application
difference	O
tables	O
to	O
produce	O
the	O
unencrypted	O
data	O
from	O
the	O
original	O
ROM	B-Device
images	O
,	O
making	O
emulation	O
possible	O
,	O
as	O
well	O
as	O
restoring	O
cartridges	O
that	O
had	O
been	O
erased	O
because	O
of	O
the	O
suicide	O
system	O
.	O
</s>
<s>
It	O
has	O
been	O
determined	O
that	O
the	O
encryption	O
employs	O
two	O
four-round	O
Feistel	B-Algorithm
ciphers	I-Algorithm
with	O
a	O
64-bit	O
key	O
.	O
</s>
<s>
The	O
algorithm	O
was	O
thereafter	O
implemented	O
in	O
this	O
state	O
for	O
all	O
known	O
CPS-2	B-Application
games	O
in	O
MAME	B-Device
.	O
</s>
<s>
In	O
April	O
2016	O
,	O
Eduardo	O
Cruz	O
,	O
Artemio	O
Urbina	O
and	O
Ian	O
Court	O
announced	O
the	O
successful	O
reverse	O
engineering	O
of	O
Capcom	O
's	O
CP	B-Application
System	I-Application
II	I-Application
security	O
programming	O
,	O
enabling	O
the	O
clean	O
"	O
de-suicide	O
"	O
and	O
restoration	O
of	O
any	O
dead	O
games	O
without	O
hardware	O
modifications	O
.	O
</s>
<s>
CPU	B-General_Concept
:	O
</s>
<s>
English	O
title	O
Release	O
date	O
Developer	O
Japanese	O
title	O
Genre	O
Super	B-Application
Street	I-Application
Fighter	I-Application
II	I-Application
:	O
The	O
New	O
ChallengersSuper	O
Street	O
Fighter	O
II	O
:	O
Tournament	O
Battle	O
1993-09-10	O
Capcom	O
Super	B-Application
Street	I-Application
Fighter	I-Application
II	I-Application
Head-to-Head	O
Fighting	O
Game	O
Eco	B-Application
Fighters	I-Application
1993-12-03	O
Capcom	O
Ultimate	B-Application
Ecology	I-Application
Shoot	O
'	O
em	O
up	O
Dungeons	B-Application
&	I-Application
Dragons	I-Application
:	I-Application
Tower	I-Application
of	I-Application
Doom	I-Application
1994-01-13	O
Capcom	O
Dungeons	B-Application
&	I-Application
Dragons	I-Application
:	I-Application
Tower	I-Application
of	I-Application
Doom	I-Application
Beat	B-Application
'	I-Application
em	I-Application
up	I-Application
Super	B-Application
Street	I-Application
Fighter	I-Application
II	I-Application
Turbo	I-Application
1994-02-23	O
Capcom	O
Super	B-Application
Street	I-Application
Fighter	I-Application
II	I-Application
X	I-Application
:	I-Application
Grand	I-Application
Master	I-Application
Challenge	I-Application
Head-to-Head	O
Fighting	O
Game	O
Alien	O
vs	O
.	O
</s>
<s>
Predator	O
1994-05-20	O
Capcom	O
Alien	O
VS	O
Predator	O
Beat	B-Application
'	I-Application
em	I-Application
up	I-Application
Darkstalkers	B-Application
:	I-Application
The	I-Application
Night	I-Application
Warriors	I-Application
1994-07-05	O
Capcom	O
Vampire	B-Application
:	I-Application
The	I-Application
Night	I-Application
Warriors	I-Application
Head-to-Head	O
Fighting	O
Game	O
Ring	B-Application
of	I-Application
Destruction	I-Application
:	I-Application
Slammasters	I-Application
II	I-Application
1994-08-08	O
Capcom	O
Super	B-Application
Muscle	I-Application
Bomber	I-Application
:	O
The	O
International	O
Blowout	O
Head-to-Head	O
Fighting	O
Game	O
Armored	B-Application
Warriors	I-Application
1994-09-16	O
Capcom	O
Powered	B-Application
Gear	I-Application
:	O
Strategic	O
Variant	O
Armor	O
Equipment	O
Beat	B-Application
'	I-Application
em	I-Application
up	I-Application
X-Men	B-Application
:	I-Application
Children	I-Application
of	I-Application
the	I-Application
Atom	I-Application
1994-12-08	O
Capcom	O
X-Men	B-Application
:	I-Application
Children	I-Application
of	I-Application
the	I-Application
Atom	I-Application
Head-to-Head	O
Fighting	O
Game	O
Night	B-Application
Warriors	I-Application
:	I-Application
Darkstalkers	I-Application
 '	I-Application
Revenge	I-Application
1995-03-02	O
Capcom	O
Vampire	B-Application
Hunter	I-Application
:	I-Application
Darkstalkers	I-Application
 '	I-Application
Revenge	I-Application
Head-to-Head	O
Fighting	O
Game	O
Cyberbots	B-Application
:	I-Application
Full	I-Application
Metal	I-Application
Madness	I-Application
1995-04-20	O
Capcom	O
Cyberbots	B-Application
:	I-Application
Full	I-Application
Metal	I-Application
Madness	I-Application
Head-to-Head	O
Fighting	O
Game	O
Street	B-Application
Fighter	I-Application
Alpha	I-Application
1995-06-05	O
Capcom	O
Street	B-Application
Fighter	I-Application
Zero	I-Application
Head-to-Head	O
Fighting	O
Game	O
Mega	B-Application
Man	I-Application
:	I-Application
The	I-Application
Power	I-Application
Battle	I-Application
1995-09-22	O
Capcom	O
Rockman	O
:	O
The	O
Power	O
Battle	O
Platformer	O
Marvel	B-Application
Super	I-Application
Heroes	I-Application
1995-10-24	O
Capcom	O
Marvel	B-Application
Super	I-Application
Heroes	I-Application
Head-to-Head	O
Fighting	O
Game	O
19XX	B-Application
:	I-Application
The	I-Application
War	I-Application
Against	I-Application
Destiny	I-Application
1995-12-07	O
Capcom	O
19XX	O
The	O
War	O
Against	O
Destiny	O
Shoot	O
'	O
em	O
up	O
Dungeons	B-Application
&	I-Application
Dragons	I-Application
:	I-Application
Shadow	I-Application
over	I-Application
Mystara	I-Application
1996-02-06	O
Capcom	O
Dungeons	B-Application
&	I-Application
Dragons	I-Application
:	I-Application
Shadow	I-Application
over	I-Application
Mystara	I-Application
Beat	B-Application
'	I-Application
em	I-Application
up	I-Application
Street	B-Application
Fighter	I-Application
Alpha	I-Application
2	I-Application
1996-02-27	O
Capcom	O
Street	B-Application
Fighter	I-Application
Zero	I-Application
2	I-Application
Head-to-Head	O
Fighting	O
Game	O
Super	B-Application
Puzzle	I-Application
Fighter	I-Application
II	I-Application
Turbo	I-Application
1996-05-29	O
Capcom	O
Super	B-Application
Puzzle	I-Application
Fighter	I-Application
II	I-Application
X	O
Puzzle	O
game	O
Mega	B-Application
Man	I-Application
2	I-Application
:	I-Application
The	I-Application
Power	I-Application
Fighters	I-Application
1996-07-08	O
Capcom	O
Rockman	O
2	O
:	O
The	O
Power	O
Fighters	O
Platformer	O
Street	B-Application
Fighter	I-Application
Alpha	I-Application
2	I-Application
Gold	O
1996-08-05	O
Capcom	O
Street	B-Application
Fighter	I-Application
Zero	I-Application
2	I-Application
Alpha	I-Application
Head-to-Head	O
Fighting	O
Game	O
Quiz	B-Application
Nanairo	I-Application
Dreams	I-Application
:	I-Application
Nijiirochō	I-Application
no	I-Application
Kiseki	I-Application
1996-08-26	O
Capcom	O
Quiz	B-Application
Nanairo	I-Application
Dreams	I-Application
:	I-Application
Nijiirochō	I-Application
no	I-Application
Kiseki	I-Application
Quiz	O
game	O
X-Men	B-Application
vs.	I-Application
Street	I-Application
Fighter	I-Application
1996-09-09	O
Capcom	O
X-Men	B-Application
vs.	I-Application
Street	I-Application
Fighter	I-Application
Head-to-Head	O
Fighting	O
Game	O
Battle	B-Application
Circuit	I-Application
1997-03-19	O
Capcom	O
Battle	B-Application
Circuit	I-Application
Beat	B-Application
'	I-Application
em	I-Application
up	I-Application
Darkstalkers	B-Application
3	I-Application
1997-05-19	O
Capcom	O
Vampire	B-Application
Savior	I-Application
:	O
The	O
Lord	O
of	O
Vampire	O
Head-to-Head	O
Fighting	O
Game	O
Marvel	B-Application
Super	I-Application
Heroes	I-Application
vs.	I-Application
Street	I-Application
Fighter	I-Application
1997-06-20	O
Capcom	O
Marvel	B-Application
Super	I-Application
Heroes	I-Application
vs.	I-Application
Street	I-Application
Fighter	I-Application
Head-to-Head	O
Fighting	O
Game	O
Capcom	O
Sports	O
Club	O
1997-07-22	O
Capcom	O
Capcom	O
Sports	O
Club	O
Sports	O
game	O
Super	B-Application
Gem	I-Application
Fighter	I-Application
Mini	I-Application
Mix	I-Application
1997-09-04	O
Capcom	O
Pocket	B-Application
Fighter	I-Application
Head-to-Head	O
Fighting	O
Game	O
Vampire	B-Application
Hunter	I-Application
2	I-Application
:	I-Application
Darkstalkers	I-Application
 '	I-Application
Revenge	I-Application
1997-09-13	O
Capcom	O
Vampire	B-Application
Hunter	I-Application
2	I-Application
:	I-Application
Darkstalkers	I-Application
 '	I-Application
Revenge	I-Application
Head-to-Head	O
Fighting	O
Game	O
Vampire	B-Application
Savior	I-Application
2	I-Application
:	I-Application
The	I-Application
Lord	I-Application
of	I-Application
Vampire	I-Application
1997-09-13	O
Capcom	O
Vampire	B-Application
Savior	I-Application
2	I-Application
:	I-Application
The	I-Application
Lord	I-Application
of	I-Application
Vampire	I-Application
Head-to-Head	O
Fighting	O
Game	O
Marvel	B-Application
vs.	I-Application
Capcom	I-Application
:	I-Application
Clash	I-Application
of	I-Application
Super	I-Application
Heroes	I-Application
1998-01-12	O
Capcom	O
Marvel	B-Application
vs.	I-Application
Capcom	I-Application
:	I-Application
Clash	I-Application
of	I-Application
Super	I-Application
Heroes	I-Application
Head-to-Head	O
Fighting	O
Game	O
Street	B-Application
Fighter	I-Application
Alpha	I-Application
3	I-Application
1998-06-29	O
Capcom	O
Street	B-Application
Fighter	I-Application
Zero	I-Application
3	I-Application
Head-to-Head	O
Fighting	O
Game	O
Giga	B-Application
Wing	I-Application
1999-02-22	O
Takumi	O
Giga	B-Application
Wing	I-Application
Shoot	O
'	O
em	O
up	O
Jyangokushi	O
:	O
Haō	O
no	O
Saihai	O
1999-05-27	O
Capcom	O
Jyangokushi	O
:	O
Haō	O
no	O
Saihai	O
Puzzle	O
game	O
Dimahoo	B-Application
2000-01-21	O
Eighting/Raizing	O
Great	O
Mahō	O
Daisakusen	O
Shoot	O
'	O
em	O
up	O
Mars	B-Application
Matrix	I-Application
:	I-Application
Hyper	I-Application
Solid	I-Application
Shooting	I-Application
2000-04-12	O
Takumi	O
Mars	B-Application
Matrix	I-Application
Shoot	O
'	O
em	O
up	O
1944	B-Application
:	I-Application
The	I-Application
Loop	I-Application
Master	I-Application
2000-06-20	O
Eighting/Raizing	O
1944	B-Application
The	I-Application
Loop	I-Application
Master	I-Application
Shoot	O
'	O
em	O
up	O
Mighty	O
!	O
</s>
