<s>
OpenEmu	B-Application
is	O
an	O
open-source	B-Application
multi-system	O
video	O
game	O
emulator	O
designed	O
for	O
macOS	B-Application
.	O
</s>
<s>
It	O
provides	O
a	O
plugin	O
interface	O
to	O
emulate	O
numerous	O
consoles	B-Device
 '	O
hardware	O
,	O
such	O
as	O
the	O
Nintendo	O
Entertainment	O
System	O
,	O
Genesis	B-Operating_System
,	O
Game	B-Device
Boy	I-Device
,	O
and	O
many	O
more	O
.	O
</s>
<s>
The	O
architecture	O
allows	O
for	O
other	O
developers	O
to	O
add	O
new	O
cores	O
to	O
the	O
base	O
system	O
without	O
the	O
need	O
to	O
account	O
for	O
specific	O
macOS	B-Application
APIs	B-General_Concept
.	O
</s>
<s>
Numerous	O
incremental	O
updates	O
have	O
been	O
released	O
since	O
then	O
,	O
with	O
plans	O
to	O
incorporate	O
support	O
for	O
more	O
consoles	B-Device
in	O
future	O
releases	O
.	O
</s>
<s>
Some	O
of	O
these	O
in-development	O
cores	O
are	O
available	O
to	O
download	O
in	O
an	O
optional	O
"	O
experimental	O
"	O
cores	O
build	O
(	O
released	O
alongside	O
the	O
regular	O
,	O
"	O
standard	O
"	O
version	O
)	O
,	O
containing	O
support	O
for	O
arcade	O
systems	O
using	O
MAME	B-Device
.	O
</s>
<s>
OpenEmu	B-Application
was	O
first	O
released	O
on	O
Wednesday	O
,	O
July	O
4th	O
,	O
2007	O
as	O
OpenNestopia	O
,	O
a	O
Cocoa-port	O
written	O
by	O
Josh	O
Weinberg	O
for	O
then	O
Mac	B-Application
OS	I-Application
X	O
10.4	O
Tiger	O
of	O
the	O
NES/Famicom	O
emulator	O
Nestopia	B-Application
(	O
written	O
by	O
Martin	O
Freij	O
)	O
.	O
</s>
<s>
Weinberg	O
and	O
his	O
friend	O
,	O
Ben	O
Devacel	O
,	O
began	O
searching	O
for	O
more	O
developers	O
to	O
port	O
other	O
emulators	O
to	O
macOS	B-Application
,	O
which	O
led	O
to	O
the	O
name	O
change	O
to	O
OpenEmu	B-Application
in	O
2009	O
,	O
to	O
better	O
describe	O
the	O
multi-system	O
emulator	O
.	O
</s>
<s>
OpenEmu	B-Application
1.0	O
released	O
on	O
Monday	O
,	O
December	O
23	O
,	O
2013	O
with	O
12	O
"	O
cores	O
"	O
emulating	O
Nintendo	O
,	O
Sega	O
,	O
NEC	O
,	O
and	O
SNK	O
's	O
home	B-Device
,	O
tabletop	B-Device
,	O
and	O
handheld	B-Application
consoles	I-Application
from	O
the	O
3rd	B-Application
through	O
7th	B-Application
video	B-Device
game	I-Device
console	I-Device
generations	I-Device
.	O
</s>
<s>
OpenEmu	B-Application
1.0	O
needed	O
Mac	B-Application
OS	I-Application
X	O
Lion	O
(	O
10.7.x	O
)	O
to	O
run	O
.	O
</s>
<s>
A	O
Wednesday	O
,	O
October	O
15	O
,	O
2014	O
(	O
296	O
days	O
later	O
)	O
midstream	O
update	O
to	O
the	O
OpenEmu	B-Application
library	O
(	O
1.0.4	O
)	O
would	O
introduce	O
Stella	B-Application
,	O
a	O
core	O
emulating	O
the	O
2600	B-General_Concept
,	O
a	O
2nd	B-Application
generation	I-Application
console	I-Application
from	O
Atari	O
.	O
</s>
<s>
Introduced	O
on	O
Wednesday	O
,	O
Dec	O
23	O
,	O
2015	O
,	O
(	O
exactly	O
two	O
years	O
after	O
1.0	O
)	O
OpenEmu	B-Application
2.0	O
was	O
released	O
.	O
</s>
<s>
OpenEmu	B-Application
2.0	O
began	O
requiring	O
a	O
minimum	O
of	O
OS	O
X	O
El	O
Capitan	O
10.11	O
,	O
dropping	O
support	O
for	O
Mac	B-Application
OS	I-Application
X	O
Lion	O
(	O
10.7.x	O
)	O
through	O
OS	O
X	O
Yosemite	O
(	O
10.10.x	O
)	O
.	O
</s>
<s>
OpenEmu	B-Application
2.0	O
introduced	O
16	O
new	O
cores	O
along	O
with	O
hundreds	O
of	O
bug	O
fixes	O
and	O
lesser	O
features	O
.	O
</s>
<s>
Another	O
midstream	O
update	O
,	O
2.0.6.1	O
,	O
released	O
Tuesday	O
,	O
Dec	O
19	O
,	O
2017	O
(	O
727	O
days	O
after	O
2.0	O
)	O
added	O
support	O
for	O
Mednafen	B-Language
's	O
Sega	B-Device
Saturn	I-Device
branch	O
,	O
with	O
a	O
suggested	O
quad-core	O
i7	O
CPU	O
to	O
emulate	O
.	O
</s>
<s>
OpenEmu	B-Application
2.1	O
(	O
Friday	O
,	O
October	O
15	O
,	O
2019	O
,	O
675	O
days	O
after	O
version	O
2.0.6.1	O
;	O
"	O
coincidentally	O
,	O
"	O
exactly	O
5	O
years	O
after	O
the	O
1.0.4	O
Stella	B-Application
update	O
)	O
was	O
significant	O
,	O
not	O
for	O
any	O
new	O
cores	O
,	O
but	O
for	O
supporting	O
Metal	O
,	O
Apple	O
's	O
visual	O
API	B-General_Concept
successor	O
to	O
OpenGL	B-Application
and	O
OpenCl	O
,	O
giving	O
OpenEmu	B-Application
significant	O
gains	O
in	O
both	O
performance	O
and	O
battery	O
life	O
.	O
</s>
<s>
OpenEmu	B-Application
2.2	O
(	O
Friday	O
December	O
27	O
,	O
2019	O
,	O
63	O
days	O
later	O
)	O
added	O
support	O
for	O
a	O
downstream	O
,	O
Metal-forked	O
version	O
of	O
Dolphin	B-Application
's	O
GameCube	B-Application
branch	O
,	O
building	O
on	O
2.1	O
'	O
s	O
foundation	O
.	O
</s>
<s>
This	O
brings	O
OpenEmu	B-Application
's	O
number	O
of	O
supported	O
cores	O
to	O
31	O
.	O
</s>
<s>
As	O
confirmed	O
by	O
the	O
OpenEmu	B-Application
developers	O
on	O
their	O
official	O
subreddit	B-Application
,	O
Sega	O
32X-CD	O
hybrid	O
games	O
(	O
versions	O
of	O
games	O
that	O
could	O
use	O
a	O
32X	B-Device
cartridge	O
and	O
Sega	B-Device
CD	I-Device
at	O
once	O
,	O
such	O
as	O
Night	B-Application
Trap	I-Application
,	O
Corpse	B-Application
Killer	I-Application
,	O
and	O
Fahrenheit	B-Application
)	O
are	O
not	O
supported	O
.	O
</s>
<s>
Users	O
are	O
prompted	O
with	O
a	O
"	O
This	O
game	O
requires	O
the	O
Sega	B-Device
32X	I-Device
attachment	O
"	O
error	O
if	O
attempted	O
.	O
</s>
<s>
At	O
present	O
,	O
GameCube	B-Application
emulation	O
does	O
n't	O
support	O
Save	O
States	O
(	O
due	O
to	O
continual	O
updates	O
breaking	O
compatibility	O
with	O
saved	O
states	O
)	O
;	O
users	O
are	O
encouraged	O
to	O
use	O
in-game	O
saves	O
.	O
</s>
<s>
OpenEmu	B-Application
GameCube	B-Application
emulation	O
also	O
does	O
not	O
support	O
the	O
at	O
present	O
(	O
despite	O
the	O
main	O
Dolphin	B-Application
branch	O
doing	O
so	O
)	O
.	O
</s>
<s>
OpenEmu	B-Application
features	O
a	O
backend	O
that	O
uses	O
multiple	O
game	O
engines	O
while	O
maintaining	O
the	O
familiar	O
,	O
native	O
macOS	B-Application
frontend	O
UI	B-Application
.	O
</s>
<s>
It	O
also	O
uses	O
modern	O
macOS	B-Application
technologies	O
such	O
as	O
Cocoa	B-Operating_System
and	O
Quartz	B-Operating_System
.	O
</s>
<s>
A	O
unique	O
feature	O
of	O
OpenEmu	B-Application
is	O
its	O
ROM	B-General_Concept
library	O
,	O
which	O
allows	O
one	O
to	O
import	O
ROM	B-General_Concept
files	I-General_Concept
and	O
view	O
them	O
in	O
a	O
gallery	O
type	O
setting	O
,	O
similar	O
to	O
iTunes	B-Operating_System
.	O
</s>
<s>
Game	O
info	O
and	O
cover	O
art	O
can	O
be	O
automatically	O
added	O
from	O
OpenEmu	B-Application
's	O
databases	O
.	O
</s>
<s>
OpenEmu	B-Application
includes	O
the	O
following	O
features	O
:	O
</s>
<s>
Can	O
play	O
ROM	B-General_Concept
hacks	O
for	O
multiple	O
systems	O
.	O
</s>
<s>
Upon	O
its	O
1.0	O
release	O
,	O
OpenEmu	B-Application
was	O
positively	O
received	O
,	O
and	O
subject	O
to	O
much	O
online	O
press	O
coverage	O
,	O
praising	O
the	O
software	O
's	O
UI	B-Application
,	O
features	O
,	O
and	O
ease	O
of	O
use	O
.	O
</s>
<s>
As	O
of	O
August	O
16	O
,	O
2018	O
,	O
OpenEmu	B-Application
has	O
been	O
downloaded	O
over	O
10,000,000	O
times	O
since	O
its	O
version	O
1.0	O
release	O
,	O
making	O
it	O
one	O
of	O
the	O
most	O
popular	O
multi-system	O
emulators	O
on	O
macOS	B-Application
.	O
</s>
