<s>
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
is	O
the	O
ninth	O
and	O
final	O
major	O
release	O
of	O
Apple	O
's	O
classic	B-Application
Mac	I-Application
OS	I-Application
operating	B-General_Concept
system	I-General_Concept
which	O
was	O
succeeded	O
by	O
Mac	B-Application
OS	I-Application
X	I-Application
(	O
renamed	O
to	O
OS	B-Application
X	I-Application
in	O
2011	O
and	O
macOS	B-Application
in	O
2016	O
)	O
in	O
2001	O
.	O
</s>
<s>
Introduced	O
on	O
October	O
23	O
,	O
1999	O
,	O
it	O
was	O
promoted	O
by	O
Apple	O
as	O
"	O
The	O
Best	O
Internet	O
Operating	B-General_Concept
System	I-General_Concept
Ever	O
"	O
,	O
highlighting	O
Sherlock	B-Operating_System
2	I-Operating_System
's	I-Operating_System
Internet	O
search	O
capabilities	O
,	O
integration	O
with	O
Apple	O
's	O
free	O
online	O
services	O
known	O
as	O
iTools	O
and	O
improved	O
Open	B-Protocol
Transport	I-Protocol
networking	O
.	O
</s>
<s>
While	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
lacks	O
protected	B-General_Concept
memory	I-General_Concept
and	O
full	O
pre-emptive	O
multitasking	O
,	O
lasting	O
improvements	O
include	O
the	O
introduction	O
of	O
an	O
automated	O
Software	O
Update	O
engine	O
and	O
support	O
for	O
multiple	B-Operating_System
users	I-Operating_System
.	O
</s>
<s>
Apple	O
discontinued	O
development	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
in	O
late	O
2001	O
,	O
transitioning	O
all	O
future	O
development	O
to	O
Mac	B-Application
OS	I-Application
X	I-Application
.	O
</s>
<s>
The	O
final	O
updates	O
to	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
addressed	O
compatibility	O
issues	O
with	O
Mac	B-Application
OS	I-Application
X	I-Application
while	O
running	O
in	O
the	O
Classic	O
Environment	O
and	O
compatibility	O
with	O
Carbon	B-Operating_System
applications	O
.	O
</s>
<s>
At	O
the	O
2002	O
Worldwide	O
Developers	O
Conference	O
,	O
Steve	O
Jobs	O
began	O
his	O
keynote	B-Protocol
address	O
by	O
staging	O
a	O
mock	O
funeral	O
for	O
OS9	O
.	O
</s>
<s>
Apple	O
billed	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
as	O
including	O
"	O
50	O
new	O
features	O
"	O
and	O
heavily	O
marketed	O
its	O
Sherlock	B-Operating_System
2	I-Operating_System
software	O
,	O
which	O
introduced	O
a	O
"	O
channels	O
"	O
feature	O
for	O
searching	O
different	O
online	O
resources	O
and	O
introduced	O
a	O
QuickTime-like	O
metallic	O
appearance	O
.	O
</s>
<s>
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
also	O
featured	O
integrated	O
support	O
for	O
Apple	O
's	O
suite	O
of	O
Internet	B-Protocol
services	I-Protocol
known	O
as	O
iTools	O
(	O
later	O
re-branded	O
as	O
.Mac	O
,	O
then	O
MobileMe	B-Application
,	O
which	O
was	O
replaced	O
by	O
iCloud	B-Application
)	O
and	O
included	O
improved	O
TCP/IP	B-Protocol
functionality	O
with	O
Open	B-Protocol
Transport	I-Protocol
2.5	O
.	O
</s>
<s>
Other	O
features	O
new	O
to	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
include	O
:	O
</s>
<s>
Integrated	O
support	O
for	O
multiple	O
user	O
accounts	O
without	O
using	O
At	B-Operating_System
Ease	I-Operating_System
.	O
</s>
<s>
Keychain	B-Application
,	O
a	O
feature	O
allowing	O
users	O
to	O
save	O
passwords	O
and	O
textual	O
data	O
encrypted	O
in	O
protected	O
keychains	B-Application
.	O
</s>
<s>
A	O
Software	O
Update	O
control	O
panel	O
for	O
automatic	O
download	O
and	O
installation	O
of	O
Apple	O
system	B-Application
software	I-Application
updates	O
.	O
</s>
<s>
A	O
redesigned	O
Sound	O
control	O
panel	O
and	O
support	O
for	O
USB	B-Protocol
audio	O
.	O
</s>
<s>
Speakable	O
Items	O
2.0	O
,	O
also	O
known	O
as	O
PlainTalk	B-Operating_System
,	O
featuring	O
improved	O
speech	O
synthesis	O
and	O
recognition	O
along	O
with	O
AppleScript	B-Application
integration	O
.	O
</s>
<s>
Remote	O
Access	O
Personal	O
Server	O
3.5	O
,	O
including	O
support	O
for	O
TCP/IP	B-Protocol
clients	O
over	O
Point-to-Point	B-Protocol
Protocol	I-Protocol
(	O
PPP	O
)	O
.	O
</s>
<s>
An	O
updated	O
version	O
of	O
AppleScript	B-Application
with	O
support	O
for	O
TCP/IP	B-Protocol
.	O
</s>
<s>
Personal	O
File	O
Sharing	O
over	O
TCP/IP	B-Protocol
.	O
</s>
<s>
USB	B-Protocol
Printer	O
Sharing	O
,	O
a	O
control	O
panel	O
allowing	O
certain	O
USB	B-Protocol
printers	O
to	O
be	O
shared	O
across	O
a	O
TCP/IP	B-Protocol
network	I-Protocol
.	O
</s>
<s>
128-bit	O
file	O
encryption	O
in	O
the	O
Finder	B-Application
.	O
</s>
<s>
Unix	B-Application
volume	O
support	O
.	O
</s>
<s>
CD	O
Burning	O
in	O
the	O
Finder	B-Application
(	O
introduced	O
in	O
Mac	B-Operating_System
OS	I-Operating_System
9.1	I-Operating_System
)	O
.	O
</s>
<s>
PowerPC	B-Architecture
versions	O
of	O
Mac	B-Application
OS	I-Application
X	I-Application
prior	O
to	O
10.5	B-Application
include	O
a	O
compatibility	O
layer	O
(	O
a	O
shell	O
)	O
called	O
Classic	O
,	O
enabling	O
users	O
to	O
run	O
applications	O
and	O
hardware	O
requiring	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
from	O
within	O
OS	B-Application
X	I-Application
.	O
</s>
<s>
This	O
is	O
achieved	O
through	O
running	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
without	O
access	O
to	O
its	O
Finder	B-Application
inside	O
OS	B-Application
X	I-Application
.	O
</s>
<s>
This	O
requires	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
to	O
be	O
installed	O
on	O
the	O
computer	O
even	O
though	O
most	O
computers	O
that	O
can	O
run	O
the	O
Classic	O
environment	O
are	O
not	O
necessarily	O
able	O
to	O
boot	O
into	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
.	O
</s>
<s>
Some	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
applications	O
do	O
not	O
run	O
well	O
in	O
Classic	O
.	O
</s>
<s>
In	O
May	O
2002	O
,	O
at	O
Apple	O
's	O
Worldwide	O
Developers	O
Conference	O
in	O
San	O
Jose	O
,	O
California	O
,	O
Steve	O
Jobs	O
,	O
accompanied	O
by	O
a	O
coffin	O
,	O
held	O
a	O
mock	O
funeral	O
to	O
announce	O
that	O
Apple	O
had	O
stopped	O
the	O
development	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
.	O
</s>
<s>
The	O
final	O
version	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
and	O
the	O
"	B-Application
classic	I-Application
"	I-Application
Mac	I-Application
OS	I-Application
was	O
Mac	B-Operating_System
OS	I-Operating_System
9.2.2	I-Operating_System
,	O
released	O
in	O
December	O
2001	O
.	O
</s>
<s>
In	O
June	O
2005	O
,	O
Jobs	O
announced	O
that	O
the	O
Macintosh	B-Operating_System
platform	O
would	O
be	O
transitioning	O
to	O
Intel	B-Operating_System
x86	I-Operating_System
microprocessors	O
.	O
</s>
<s>
Developer	O
documentation	O
of	O
the	O
Rosetta	B-Operating_System
PowerPC	B-Architecture
emulation	O
layer	O
revealed	O
that	O
applications	O
written	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
8	I-Operating_System
or	O
9	O
would	O
not	O
run	O
on	O
x86-based	O
Macs	O
.	O
</s>
<s>
The	O
Classic	O
Environment	O
remains	O
in	O
the	O
PowerPC	B-Architecture
version	O
of	O
10.4	B-Application
;	O
however	O
,	O
x86	B-Operating_System
versions	O
of	O
OS	B-Application
X	I-Application
do	O
not	O
support	O
the	O
Classic	O
environment	O
.	O
</s>
<s>
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
can	O
be	O
emulated	O
by	O
using	O
SheepShaver	B-Application
,	O
a	O
PowerPC	B-Architecture
emulator	O
available	O
on	O
multiple	O
operating	B-General_Concept
systems	I-General_Concept
,	O
including	O
Intel-based	O
Macs	O
.	O
</s>
<s>
However	O
,	O
SheepShaver	B-Application
cannot	O
run	O
Mac	B-Application
OS	I-Application
versions	O
newer	O
than	O
9.0.4	O
,	O
as	O
there	O
is	O
no	O
support	O
for	O
a	O
memory	B-General_Concept
management	I-General_Concept
unit	I-General_Concept
.	O
</s>
<s>
The	O
PearPC	B-Operating_System
PowerPC	B-Architecture
emulator	O
does	O
not	O
support	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
.	O
</s>
<s>
QEMU	B-Application
has	O
experimental	O
support	O
for	O
running	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
using	O
PowerPC	B-Architecture
G4	B-Device
emulation	O
.	O
</s>
<s>
The	O
final	O
Macs	O
that	O
were	O
able	O
to	O
boot	O
into	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
natively	O
were	O
the	O
867MHz	O
and	O
1GHz	O
"	O
Antimony	O
"	O
Titanium	O
PowerBook	B-Operating_System
G4	I-Operating_System
released	O
in	O
November	O
2002	O
and	O
the	O
1GHz	O
and	O
1.25GHz	O
"	O
Mirrored	O
Drive	O
Doors	O
"	O
Power	B-Device
Mac	I-Device
G4	I-Device
released	O
in	O
August	O
2002	O
,	O
which	O
were	O
re-released	O
in	O
June	O
2003	O
due	O
to	O
a	O
perceived	O
demand	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
machines	O
.	O
</s>
<s>
These	O
machines	O
were	O
released	O
around	O
the	O
time	O
when	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
was	O
still	O
offered	O
on	O
some	O
Macs	O
up	O
until	O
2004	O
,	O
even	O
though	O
development	O
had	O
stopped	O
in	O
late	O
2001	O
.	O
</s>
<s>
Both	O
the	O
"	O
Antimony	O
"	O
Titanium	O
PowerBook	B-Operating_System
G4	I-Operating_System
and	O
the	O
"	O
Mirrored	O
Drive	O
Doors	O
"	O
Power	B-Device
Mac	I-Device
G4	I-Device
came	O
preinstalled	O
with	O
both	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
and	O
Mac	B-Application
OS	I-Application
X	I-Application
in	O
a	O
dual-boot	B-Operating_System
configuration	O
(	O
with	O
Mac	B-Application
OS	I-Application
X	I-Application
being	O
selected	O
by	O
default	O
)	O
.	O
</s>
<s>
The	O
"	O
Antimony	O
"	O
Titanium	O
PowerBook	B-Operating_System
G4	I-Operating_System
was	O
the	O
last	O
PowerBook	B-Device
model	O
able	O
to	O
run	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
natively	O
,	O
while	O
the	O
"	O
Mirrored	O
Drive	O
Doors	O
"	O
Power	B-Device
Mac	I-Device
G4	I-Device
was	O
one	O
of	O
the	O
last	O
Mac	O
models	O
overall	O
to	O
officially	O
boot	O
into	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
.	O
</s>
<s>
While	O
these	O
final	O
models	O
of	O
the	O
Macs	O
and	O
PowerBooks	B-Device
have	O
G4	B-Device
processors	O
with	O
faster	O
clock	O
speeds	O
up	O
to	O
1GHz	O
and	O
1.25GHz	O
respectively	O
,	O
they	O
were	O
able	O
to	O
boot	O
into	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
natively	O
without	O
any	O
issues	O
.	O
</s>
<s>
The	O
majority	O
of	O
G4	B-Device
Macs	O
released	O
in	O
2003	O
that	O
have	O
a	O
1GHz	O
and	O
higher	O
processor	O
cannot	O
boot	O
into	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
outside	O
of	O
the	O
Classic	O
environment	O
as	O
the	O
"	O
Mac	B-Application
OS	I-Application
ROM	O
"	O
was	O
never	O
updated	O
to	O
allow	O
those	O
Macs	O
,	O
which	O
were	O
developed	O
during	O
the	O
OS	B-Application
X	I-Application
era	O
,	O
to	O
directly	O
boot	O
it	O
(	O
All	O
G5	B-Device
Macs	O
cannot	O
boot	O
into	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
at	O
all	O
since	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
does	O
not	O
recognize	O
the	O
G5	B-Device
processors	O
,	O
and	O
therefore	O
can	O
only	O
be	O
run	O
under	O
the	O
Classic	O
environment	O
)	O
.	O
</s>
<s>
In	O
recent	O
years	O
,	O
unofficial	O
patches	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
and	O
the	O
"	O
Mac	B-Application
OS	I-Application
ROM	O
"	O
have	O
been	O
made	O
to	O
allow	O
unsupported	O
G4	B-Device
Macs	O
to	O
boot	O
into	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
;	O
however	O
this	O
is	O
not	O
officially	O
supported	O
by	O
Apple	O
.	O
</s>
<s>
Aside	O
from	O
Apple-branded	O
hardware	O
that	O
is	O
still	O
maintained	O
and	O
operated	O
,	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
can	O
be	O
operated	O
in	O
other	O
environments	O
such	O
as	O
Windows	B-Application
and	O
Unix	B-Application
.	O
</s>
<s>
For	O
example	O
,	O
the	O
aforementioned	O
SheepShaver	B-Application
software	O
was	O
initially	O
not	O
designed	O
for	O
use	O
on	O
x86	B-Operating_System
platforms	O
and	O
required	O
an	O
actual	O
PowerPC	B-Architecture
processor	I-Architecture
present	O
in	O
the	O
machine	O
it	O
was	O
running	O
on	O
similar	O
to	O
a	O
hypervisor	B-Operating_System
.	O
</s>
<s>
Although	O
it	O
provides	O
PowerPC	B-Architecture
processor	I-Architecture
support	O
,	O
it	O
can	O
only	O
run	O
up	O
to	O
Mac	O
OS	O
9.0.4	O
because	O
it	O
does	O
not	O
emulate	O
a	O
memory	B-General_Concept
management	I-General_Concept
unit	I-General_Concept
.	O
</s>
<s>
Updates	O
to	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
include	O
9.0.4	O
,	O
9.1	O
,	O
9.2.1	O
,	O
and	O
9.2.2	O
.	O
</s>
<s>
Mac	O
OS	O
9.0.4	O
was	O
a	O
collection	O
of	O
bug	O
fixes	O
primarily	O
relating	O
to	O
USB	B-Protocol
and	O
FireWire	O
support	O
.	O
</s>
<s>
Mac	B-Operating_System
OS	I-Operating_System
9.1	I-Operating_System
included	O
integrated	O
CD	O
burning	O
support	O
in	O
the	O
Macintosh	B-Application
Finder	I-Application
and	O
added	O
a	O
new	O
Window	O
menu	O
in	O
the	O
Finder	B-Application
for	O
switching	O
between	O
open	O
windows	B-Application
.	O
</s>
<s>
Mac	B-Operating_System
OS	I-Operating_System
9.2	I-Operating_System
increased	O
performance	O
noticeably	O
and	O
improved	O
Classic	O
Environment	O
support	O
.	O
</s>
