<s>
Multi	B-Application
Emulator	I-Application
Super	I-Application
System	I-Application
(	O
MESS	O
)	O
is	O
an	O
emulator	B-Application
for	O
various	O
consoles	B-Device
and	O
computer	O
systems	O
,	O
based	O
on	O
the	O
MAME	B-Device
core	O
.	O
</s>
<s>
It	O
used	O
to	O
be	O
a	O
standalone	O
program	O
(	O
which	O
has	O
since	O
been	O
discontinued	O
)	O
,	O
but	O
is	O
now	O
integrated	O
into	O
MAME	B-Device
(	O
which	O
is	O
actively	O
developed	O
)	O
.	O
</s>
<s>
MESS	O
emulates	B-Application
portable	B-Device
and	O
console	B-Device
gaming	I-Device
systems	I-Device
,	O
computer	B-Device
platforms	I-Device
,	O
and	O
calculators	B-Application
.	O
</s>
<s>
The	O
project	O
strives	O
for	O
accuracy	O
and	O
portability	O
and	O
therefore	O
is	O
not	O
always	O
the	O
fastest	O
emulator	B-Application
for	O
any	O
one	O
particular	O
system	O
.	O
</s>
<s>
Its	O
accuracy	O
makes	O
it	O
also	O
useful	O
for	O
homebrew	B-Application
game	O
development	O
.	O
</s>
<s>
MAME	B-Device
and	O
MESS	O
were	O
once	O
separate	O
applications	O
,	O
but	O
were	O
later	O
developed	O
and	O
released	O
together	O
from	O
a	O
single	O
source	O
repository	O
.	O
</s>
<s>
MAMEDEV	O
member	O
David	O
Haywood	O
maintained	O
and	O
distributed	O
UME	B-Application
(	O
Universal	O
Machine	O
Emulator	B-Application
)	O
which	O
combined	O
much	O
of	O
the	O
functionality	O
of	O
MAME	B-Device
and	O
MESS	O
in	O
a	O
single	O
application	O
.	O
</s>
<s>
On	O
May	O
27	O
,	O
2015	O
,	O
MESS	O
was	O
formally	O
integrated	O
with	O
MAME	B-Device
and	O
became	O
a	O
part	O
of	O
MAME	B-Device
.	O
</s>
<s>
MESS	O
was	O
distributed	O
under	O
the	O
MAME	B-Device
Licence	O
,	O
which	O
allowed	O
for	O
the	O
redistribution	O
of	O
binary	O
files	O
and	O
source	O
code	O
,	O
either	O
modified	O
or	O
unmodified	O
,	O
but	O
disallowed	O
selling	O
MESS	O
or	O
using	O
it	O
commercially	O
.	O
</s>
<s>
The	O
license	O
is	O
similar	O
to	O
other	O
copyleft	B-License
licenses	I-License
in	O
requiring	O
that	O
rights	O
and	O
obligations	O
provided	O
in	O
the	O
license	O
must	O
be	O
remain	O
intact	O
when	O
MESS	O
or	O
derivative	O
works	O
are	O
distributed	O
.	O
</s>
<s>
Adding	O
one	O
text	O
file	O
to	O
advertise	O
your	O
web	O
site	O
is	O
tolerated	O
only	O
if	O
your	O
site	O
contributes	O
original	O
material	O
to	O
the	O
emulation	B-Application
scene.	O
"	O
</s>
<s>
The	O
MAME	B-Device
license	O
required	O
source	O
code	O
be	O
included	O
with	O
versions	O
of	O
MESS	O
that	O
are	O
modified	O
from	O
the	O
original	O
source	O
,	O
while	O
the	O
MESS	O
legal	O
page	O
states	O
that	O
when	O
distributing	O
binary	O
files	O
"	O
you	O
should	O
also	O
distribute	O
the	O
source	O
code	O
.	O
</s>
<s>
While	O
MESS	O
was	O
available	O
in	O
both	O
binary	O
and	O
source	O
code	O
forms	O
,	O
the	O
restrictions	O
on	O
commercial	O
exploitation	O
cause	O
it	O
to	O
fall	O
outside	O
of	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
's	O
definition	O
of	O
free	B-Application
software	I-Application
.	O
</s>
<s>
Similarly	O
MESS	O
was	O
not	O
considered	O
to	O
be	O
open	B-Application
source	I-Application
software	I-Application
if	O
appraised	O
according	O
to	O
the	O
criteria	O
of	O
the	B-License
Open	I-License
Source	I-License
Definition	I-License
.	O
</s>
<s>
Generally	O
the	O
emulation	B-Application
only	O
includes	O
raw	O
hardware	O
logic	O
,	O
such	O
as	O
for	O
the	O
CPU	B-Device
and	O
RAM	B-Architecture
,	O
and	O
specialized	O
DSPs	O
such	O
as	O
tone	O
generators	O
or	O
video	O
sprites	O
.	O
</s>
<s>
The	O
MESS	O
emulator	B-Application
does	O
not	O
include	O
any	O
programming	O
code	O
stored	O
in	O
ROM	B-Device
chips	I-Device
from	O
the	O
emulated	B-Application
computer	O
,	O
since	O
this	O
may	O
be	O
copyrighted	O
software	O
.	O
</s>
<s>
Obtaining	O
the	O
ROM	B-Device
data	O
by	O
oneself	O
directly	O
from	O
the	O
hardware	O
being	O
emulated	B-Application
can	O
be	O
extremely	O
difficult	O
,	O
technical	O
,	O
expensive	O
,	O
and	O
even	O
destructive	O
since	O
it	O
may	O
require	O
decapping	O
or	O
desoldering	O
of	O
integrated	O
circuit	O
chips	O
from	O
the	O
circuit	O
board	O
of	O
the	O
device	O
they	O
own	O
.	O
</s>
<s>
A	O
desoldered	O
IC	O
is	O
placed	O
into	O
a	O
chip	O
reader	O
device	O
connected	O
to	O
a	O
USB	B-Protocol
or	O
serial	B-Protocol
port	I-Protocol
of	O
another	O
computer	O
,	O
with	O
pin	O
sockets	O
on	O
the	O
reader	O
specifically	O
designed	O
to	O
match	O
the	O
chip	B-Algorithm
package	I-Algorithm
shape	O
in	O
question	O
,	O
to	O
perform	O
a	O
memory	B-Error_Name
dump	I-Error_Name
of	O
the	O
ROM	B-Device
to	O
a	O
data	O
file	O
.	O
</s>
<s>
Removal	O
of	O
a	O
soldered	O
chip	O
is	O
often	O
far	O
easier	O
than	O
reinstalling	O
it	O
,	O
especially	O
for	O
extremely	O
small	O
surface	O
mount	O
technology	O
chips	O
,	O
and	O
the	O
emulated	B-Application
device	O
in	O
question	O
may	O
be	O
effectively	O
destroyed	O
beyond	O
recovery	O
after	O
the	O
ROM	B-Device
has	O
been	O
removed	O
for	O
reading	O
.	O
</s>
<s>
However	O
,	O
if	O
one	O
has	O
a	O
working	O
system	O
,	O
it	O
may	O
be	O
far	O
easier	O
to	O
dump	O
the	O
ROM	B-Device
data	O
to	O
tape	O
,	O
disk	O
,	O
etc	O
.	O
</s>
<s>
In	O
2013	O
the	O
Internet	O
Archive	O
began	O
to	O
provide	O
abandonware	O
games	O
browser-playable	O
via	O
JSMESS	O
(	O
a	O
JavaScript	B-Language
port	O
of	O
the	O
MESS	O
emulator	B-Application
)	O
,	O
for	O
instance	O
,	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
game	O
E.T.	B-Application
</s>
