<s>
ZSNES	B-Language
is	O
a	O
free	B-Application
software	I-Application
Super	B-Application
Nintendo	I-Application
Entertainment	I-Application
System	I-Application
emulator	B-Application
written	O
mostly	O
in	O
x86	B-Language
assembly	I-Language
with	O
official	O
ports	O
for	O
Linux	B-Application
,	O
DOS	B-Device
,	O
Windows	B-Application
,	O
and	O
unofficial	O
ports	O
for	O
Xbox	B-Device
and	O
macOS	B-Application
.	O
</s>
<s>
Development	O
of	O
ZSNES	B-Language
began	O
on	O
3	O
July	O
1997	O
and	O
the	O
first	O
version	O
was	O
released	O
on	O
14	O
October	O
1997	O
,	O
for	O
DOS	B-Device
.	O
</s>
<s>
Since	O
then	O
,	O
official	O
ports	O
have	O
been	O
made	O
for	O
Windows	B-Application
and	O
Linux	B-Application
.	O
</s>
<s>
The	O
emulator	B-Application
became	O
free	B-Application
software	I-Application
under	O
the	O
GPL-2.0-or-later	B-License
license	O
on	O
2	O
April	O
2001	O
.	O
</s>
<s>
Despite	O
an	O
announcement	O
by	O
adventure_of_link	O
stating	O
that	O
"	O
ZSNES	B-Language
is	O
NOT	O
dead	O
,	O
it	O
's	O
still	O
in	O
development	O
"	O
made	O
on	O
the	O
ZSNES	B-Language
board	O
after	O
the	O
departure	O
of	O
its	O
original	O
developers	O
zsKnight	B-Language
and	O
_Demo_	O
,	O
development	O
has	O
slowed	O
dramatically	O
since	O
its	O
last	O
version	O
(	O
1.51	O
released	O
on	O
24	O
January	O
2007	O
)	O
.	O
</s>
<s>
Much	O
of	O
the	O
development	O
efforts	O
concentrated	O
on	O
increasing	O
the	O
emulator	B-Application
's	O
portability	O
,	O
by	O
rewriting	O
assembly	B-Language
code	I-Language
in	O
C	B-Language
and	O
C++	B-Language
,	O
including	O
a	O
new	O
GUI	B-Application
using	O
Qt	B-Language
.	O
</s>
<s>
ZSNES	B-Language
is	O
notable	O
in	O
that	O
it	O
was	O
early	O
in	O
being	O
able	O
to	O
emulate	O
several	O
of	O
the	O
SNES	B-General_Concept
enhancement	I-General_Concept
chips	I-General_Concept
at	O
some	O
level	O
.	O
</s>
<s>
Until	O
version	O
1.50	O
,	O
ZSNES	B-Language
featured	O
netplay	O
via	O
TCP/IP	B-Protocol
or	O
UDP	B-Protocol
.	O
</s>
<s>
An	O
early	O
ZSNES	B-Language
feature	O
of	O
interest	O
were	O
"	O
ZMV	O
movies	O
"	O
.	O
</s>
<s>
This	O
feature	O
enabled	O
players	O
to	O
record	O
their	O
play	O
session	O
inputs	O
and	O
then	O
output	O
those	O
to	O
a	O
ZMV	O
file	O
,	O
in	O
such	O
a	O
way	O
that	O
another	O
user	O
with	O
a	O
copy	O
of	O
ZSNES	B-Language
,	O
a	O
matching	O
ROM	B-Device
file	O
,	O
and	O
the	O
ZMV	O
file	O
,	O
should	O
be	O
able	O
to	O
"	O
watch	O
"	O
the	O
other	O
person	O
's	O
gameplay	O
.	O
</s>
<s>
Because	O
ZSNES	B-Language
is	O
largely	O
written	O
in	O
low-level	B-Language
assembly	B-Language
language	I-Language
for	O
x86	B-Operating_System
processors	O
,	O
the	O
idea	O
of	O
porting	O
ZSNES	B-Language
to	O
devices	O
using	O
RISC	B-Architecture
architectures	I-Architecture
such	O
as	O
ARM	B-Architecture
is	O
highly	O
unfeasible	O
.	O
</s>
<s>
Commercial	O
gaming	O
consoles	O
did	O
not	O
typically	O
use	O
x86	B-Operating_System
processors	O
(	O
with	O
the	B-Application
original	I-Application
Xbox	I-Application
being	O
the	O
most	O
well-known	O
exception	O
)	O
prior	O
to	O
the	O
eighth	B-Application
generation	I-Application
,	O
with	O
the	O
2013	O
releases	O
of	O
the	B-Device
Xbox	I-Device
One	I-Device
and	O
PlayStation	B-Operating_System
4	I-Operating_System
.	O
</s>
<s>
The	O
first	O
public	O
release	O
of	O
ZSNES	B-Language
was	O
version	O
0.150	O
,	O
in	O
October	O
14	O
,	O
1997	O
.	O
</s>
<s>
It	O
incorporated	O
the	O
entire	O
65816	B-General_Concept
instruction	O
set	O
from	O
the	O
SNES	B-Application
's	O
modified	O
WDC	B-General_Concept
65C816	I-General_Concept
microprocessor	O
,	O
as	O
well	O
as	O
SRAM	O
support	O
and	O
partial	O
Mode	O
7	O
implementation	O
.	O
</s>
<s>
Version	O
0.600	O
from	O
September	O
9	O
,	O
1998	O
was	O
the	O
first	O
to	O
feature	O
developer	O
Pharos	O
(	O
as	O
a	O
coding	O
assistant	O
)	O
,	O
and	O
was	O
a	O
milestone	O
release	O
due	O
to	O
the	O
implementation	O
a	O
of	O
new	O
16-bit	O
graphics	O
engine	O
,	O
as	O
well	O
as	O
featuring	O
an	O
entirely	O
new	O
GUI	B-Application
with	O
more	O
functions	O
available	O
than	O
before	O
.	O
</s>
<s>
Shortly	O
afterwards	O
,	O
version	O
0.700	O
from	O
October	O
27	O
,	O
1998	O
was	O
the	O
first	O
to	O
compile	O
with	O
C	B-Language
code	O
.	O
</s>
<s>
Version	O
1.000	O
from	O
September	O
1	O
,	O
2000	O
marks	O
ZSNES	B-Language
's	O
first	O
official	O
Windows	B-Application
release	O
,	O
and	O
the	O
next	O
several	O
versions	O
of	O
the	O
emulator	B-Application
focused	O
on	O
improving	O
the	O
quality	O
of	O
this	O
port	O
.	O
</s>
<s>
Release	O
1.30b	O
from	O
June	O
16	O
,	O
2001	O
can	O
be	O
considered	O
a	O
landmark	O
in	O
Super	B-Application
Nintendo	I-Application
emulation	B-Application
,	O
as	O
it	O
added	O
initial	O
support	O
to	O
Star	O
Ocean	O
and	O
its	O
S-DD1	O
compression	O
chip	O
.	O
</s>
<s>
This	O
title	O
pushed	O
the	O
limits	O
of	O
the	O
system	O
's	O
hardware	O
,	O
boasting	O
voice	O
clips	O
and	O
enhanced	O
graphics	O
,	O
and	O
was	O
tricky	O
to	O
even	O
get	O
running	O
on	O
an	O
emulator	B-Application
.	O
</s>
<s>
After	O
zsKnight	B-Language
's	O
departure	O
for	O
personal	O
reasons	O
in	O
July	O
of	O
2001	O
,	O
the	O
project	O
made	O
a	O
release	O
in	O
homage	O
to	O
him	O
and	O
his	O
family	O
,	O
version	O
1.337	O
,	O
from	O
September	O
30	O
,	O
2001	O
.	O
</s>
<s>
The	O
emulator	B-Application
continued	O
being	O
updated	O
until	O
July	O
of	O
2002	O
,	O
but	O
releases	O
halted	O
,	O
and	O
it	O
would	O
be	O
more	O
than	O
two	O
years	O
until	O
a	O
new	O
public	O
release	O
was	O
out	O
.	O
</s>
<s>
When	O
version	O
1.40	O
eventually	O
released	O
in	O
December	O
25	O
,	O
2004	O
,	O
it	O
marked	O
a	O
turning	O
point	O
for	O
the	O
project	O
,	O
with	O
new	O
contributors	O
and	O
significant	O
overhauls	O
to	O
the	O
emulator	B-Application
's	O
ageing	O
systems	O
.	O
</s>
<s>
Developers	O
Nach	O
and	O
pagefault	O
particularly	O
focused	O
on	O
removing	O
several	O
of	O
the	O
infamous	O
hacks	O
that	O
were	O
part	O
of	O
ZSNES	B-Language
's	O
code	O
base	O
,	O
implementing	O
proper	O
code	O
that	O
tricky	O
games	O
relied	O
on	O
.	O
</s>
<s>
Version	O
v1.50	O
from	O
December	O
22	O
,	O
2006	O
was	O
another	O
major	O
overhaul	O
,	O
which	O
according	O
to	O
the	O
developers	O
:	O
"	O
ZSNES	B-Language
is	O
a	O
program	O
with	O
over	O
200,000	O
lines	O
of	O
source	O
code	O
,	O
and	O
in	O
this	O
release	O
,	O
over	O
25%	O
of	O
that	O
has	O
been	O
modified	O
;	O
also	O
,	O
around	O
15%	O
of	O
the	O
assembly	O
has	O
been	O
ported	O
to	O
C.	O
"	O
This	O
was	O
the	O
final	O
major	O
release	O
of	O
the	O
emulator	B-Application
,	O
being	O
followed	O
by	O
the	O
minor	O
1.51	O
,	O
and	O
winding	O
down	O
thereafter	O
.	O
</s>
<s>
ZSNES	B-Language
was	O
generally	O
well-regarded	O
in	O
its	O
heyday	O
,	O
with	O
British	O
game	O
magazine	O
Retro	O
Gamer	O
in	O
2005	O
calling	O
the	O
emulator	B-Application
"	O
very	O
impressive	O
"	O
and	O
praising	O
the	O
"	O
incredible	O
toaster	O
mode	O
"	O
.	O
</s>
<s>
However	O
,	O
with	O
the	O
more	O
recent	O
development	O
of	O
more	O
accurate	O
SNES	B-Application
emulators	B-Application
such	O
as	O
Snes9x	B-Operating_System
and	O
higan	B-Language
as	O
computers	O
have	O
gradually	O
become	O
more	O
powerful	O
,	O
retrospective	O
reviews	O
have	O
criticized	O
ZSNES	B-Language
not	O
only	O
for	O
its	O
relatively	O
low	O
accuracy	O
,	O
but	O
also	O
because	O
its	O
former	O
popularity	O
has	O
led	O
several	O
fan-made	O
translations	O
and	O
modifications	O
to	O
be	O
designed	O
with	O
specific	O
workarounds	O
for	O
the	O
emulator	B-Application
's	O
inaccuracies	O
,	O
which	O
often	O
makes	O
them	O
unplayable	O
both	O
on	O
real	O
hardware	O
and	O
in	O
the	O
newer	O
emulators	B-Application
that	O
have	O
superseded	O
ZSNES	B-Language
.	O
</s>
<s>
Some	O
of	O
these	O
other	O
emulators	B-Application
even	O
include	O
a	O
mode	O
which	O
is	O
explicitly	O
designed	O
to	O
replicate	O
the	O
quirks	O
of	O
ZSNES	B-Language
,	O
allowing	O
the	O
ZSNES-focused	O
mods	O
to	O
become	O
playable	O
again	O
.	O
</s>
<s>
In	O
2015	O
an	O
exploit	O
that	O
allowed	O
a	O
specially	O
crafted	O
SNES	B-Application
ROM	B-Device
to	O
gain	O
control	O
of	O
the	O
host	O
system	O
,	O
and	O
thus	O
be	O
able	O
to	O
execute	O
malicious	O
code	O
,	O
was	O
discovered	O
in	O
version	O
1.51	O
;	O
a	O
partially	O
fixed	O
preview	O
build	O
was	O
released	O
shortly	O
afterwards	O
.	O
</s>
