<s>
New	B-Device
World	I-Device
ROM	I-Device
computers	O
are	O
Macintosh	B-Device
models	O
that	O
do	O
not	O
use	O
a	O
Macintosh	B-Device
Toolbox	I-Device
ROM	B-Device
on	O
the	O
logic	O
board	O
.	O
</s>
<s>
Due	O
to	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
not	O
requiring	O
the	O
availability	O
of	O
the	O
Toolbox	O
,	O
this	O
allowed	O
ROM	B-Device
sizes	O
to	O
shrink	O
dramatically	O
(	O
typically	O
from	O
to	O
)	O
,	O
and	O
facilitated	O
the	O
use	O
of	O
flash	B-Device
memory	I-Device
for	O
system	O
firmware	O
instead	O
of	O
the	O
now	O
more	O
expensive	O
and	O
less	O
flexible	O
Mask	B-Device
ROM	I-Device
that	O
most	O
previous	O
Macs	B-Device
used	O
.	O
</s>
<s>
A	O
facility	O
for	O
loading	O
the	O
Toolbox	O
from	O
the	O
startup	O
device	O
was	O
,	O
however	O
,	O
made	O
available	O
,	O
allowing	O
the	O
use	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
8	I-Operating_System
and	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
on	O
New	O
World	O
machines	O
.	O
</s>
<s>
The	O
New	O
World	O
architecture	O
was	O
developed	O
for	O
the	O
Macintosh	B-Device
Network	I-Device
Computer	I-Device
,	O
an	O
unrealized	O
project	O
that	O
eventually	O
contributed	O
several	O
key	O
technologies	O
to	O
the	O
first-generation	O
iMac	B-Device
.	O
</s>
<s>
All	O
PowerPC	B-Architecture
Macs	B-Device
from	O
the	O
iMac	B-Device
,	O
the	O
iBook	B-Device
,	O
the	O
Blue	B-Device
and	I-Device
White	I-Device
Power	I-Device
Mac	I-Device
G3	I-Device
and	O
the	O
Bronze	O
Keyboard	O
(	O
Lombard	O
)	O
PowerBook	B-Device
G3	O
forward	O
are	O
New	B-Device
World	I-Device
ROM	I-Device
machines	O
,	O
while	O
all	O
previous	O
models	O
(	O
including	O
the	O
Beige	O
Power	B-Device
Mac	I-Device
G3	I-Device
and	O
all	O
other	O
beige	O
and	O
platinum	O
Macs	B-Device
)	O
are	O
Old	B-Device
World	I-Device
ROM	I-Device
machines	O
.	O
</s>
<s>
Intel	B-Operating_System
based	O
Macs	B-Device
are	O
incapable	O
of	O
running	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
(	O
or	O
,	O
indeed	O
,	O
any	O
version	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
prior	O
to	O
Tiger	B-Application
)	O
,	O
and	O
on	O
these	O
machines	O
EFI	B-Architecture
is	O
used	O
instead	O
of	O
Open	B-Architecture
Firmware	I-Architecture
,	O
which	O
both	O
New	O
World	O
and	O
Old	O
World	O
machines	O
are	O
based	O
on	O
.	O
</s>
<s>
New	B-Device
World	I-Device
ROM	I-Device
Macs	B-Device
are	O
the	O
first	O
Macs	B-Device
where	O
direct	O
usage	O
of	O
the	O
Open	B-Architecture
Firmware	I-Architecture
(	O
OF	O
)	O
subsystem	O
is	O
encouraged	O
.	O
</s>
<s>
Previous	O
PCI	B-Protocol
Power	B-Device
Macs	I-Device
used	O
Open	B-Architecture
Firmware	I-Architecture
for	O
booting	O
,	O
but	O
the	O
implementation	O
was	O
not	O
complete	O
;	O
in	O
these	O
machines	O
OF	O
was	O
only	O
expected	O
to	O
probe	O
PCI	B-Protocol
devices	O
,	O
then	O
immediately	O
hand	O
control	O
over	O
to	O
the	O
Mac	B-Device
OS	O
ROM	B-Device
.	O
</s>
<s>
Because	O
of	O
this	O
,	O
versions	O
1.0.5	O
and	O
2.x	O
had	O
several	O
serious	O
bugs	O
,	O
as	O
well	O
as	O
missing	O
functionality	O
(	O
such	O
as	O
being	O
able	O
to	O
load	O
files	O
from	O
a	O
HFS	B-Application
partition	O
or	O
a	O
TFTP	B-Device
server	O
)	O
.	O
</s>
<s>
Apple	O
also	O
set	O
the	O
default	O
input	O
and	O
output	O
devices	O
to	O
(	O
the	O
modem	O
port	O
on	O
beige	O
Macs	B-Device
)	O
,	O
which	O
made	O
it	O
difficult	O
for	O
normal	O
users	O
to	O
get	O
to	O
Open	B-Architecture
Firmware	I-Architecture
;	O
to	O
do	O
so	O
it	O
was	O
necessary	O
to	O
either	O
hook	O
up	O
a	O
terminal	O
,	O
or	O
change	O
the	O
Open	B-Architecture
Firmware	I-Architecture
settings	O
from	O
inside	O
Mac	B-Device
OS	O
using	O
a	O
tool	O
such	O
as	O
Boot	O
Variables	O
or	O
Apple	O
's	O
System	O
Disk	O
.	O
</s>
<s>
The	O
New	B-Device
World	I-Device
ROM	I-Device
introduced	O
a	O
much-improved	O
version	O
of	O
the	O
Open	B-Architecture
Firmware	I-Architecture
interpreter	O
,	O
version	O
3.0	O
,	O
which	O
added	O
many	O
missing	O
features	O
,	O
fixed	O
most	O
of	O
the	O
bugs	O
from	O
earlier	O
versions	O
,	O
and	O
had	O
the	O
capability	O
to	O
run	O
CHRP	B-Device
boot	O
scripts	O
.	O
</s>
<s>
The	O
Toolbox	O
ROM	B-Device
was	O
embedded	O
inside	O
a	O
CHRP	B-Device
script	O
in	O
the	O
System	B-Operating_System
Folder	I-Operating_System
called	O
"	O
Mac	B-Device
OS	O
ROM	B-Device
"	O
,	O
along	O
with	O
a	O
short	O
loader	O
stub	O
and	O
a	O
copy	O
of	O
the	O
Happy	O
Mac	B-Device
icon	O
suitable	O
for	O
display	O
from	O
Open	B-Architecture
Firmware	I-Architecture
.	O
</s>
<s>
Once	O
the	O
ROM	B-Device
was	O
loaded	O
from	O
disk	O
,	O
the	O
Mac	B-Device
boot	O
sequence	O
continued	O
as	O
usual	O
.	O
</s>
<s>
As	O
before	O
,	O
Open	B-Architecture
Firmware	I-Architecture
could	O
also	O
run	O
a	O
binary	O
boot	B-Application
loader	I-Application
,	O
and	O
version	O
3.0	O
added	O
support	O
for	O
ELF	O
objects	O
as	O
well	O
as	O
the	O
XCOFF	B-Operating_System
files	O
versions	O
1.0.5	O
and	O
2.0	O
supported	O
.	O
</s>
<s>
Also	O
,	O
version	O
3.0	O
(	O
as	O
well	O
as	O
some	O
of	O
the	O
last	O
releases	O
of	O
version	O
2.x	O
,	O
starting	O
with	O
the	O
PowerBook	B-Device
3400	O
)	O
officially	O
supported	O
direct	O
access	O
to	O
the	O
Open	B-Architecture
Firmware	I-Architecture
command	O
prompt	O
from	O
the	O
console	O
(	O
by	O
setting	O
the	O
auto-boot	O
?	O
</s>
<s>
variable	O
to	O
false	O
from	O
Mac	B-Device
OS	O
,	O
or	O
by	O
holding	O
down	O
---	O
at	O
boot	O
)	O
.	O
</s>
<s>
One	O
major	O
difference	O
between	O
Old	B-Device
World	I-Device
ROM	I-Device
Macs	B-Device
and	O
New	B-Device
World	I-Device
ROM	I-Device
Macs	B-Device
,	O
at	O
least	O
in	O
Classic	O
Mac	B-Device
OS	O
,	O
is	O
that	O
the	O
Gestalt	O
selector	O
for	O
the	O
machine	O
type	O
is	O
no	O
longer	O
usable	O
;	O
all	O
New	B-Device
World	I-Device
ROM	I-Device
Macs	B-Device
use	O
the	O
same	O
mach	O
ID	O
,	O
406	O
decimal	O
,	O
and	O
the	O
actual	O
machine	O
ID	O
is	O
encoded	O
in	O
the	O
"	O
model	O
"	O
and	O
"	O
compatible	O
"	O
properties	O
of	O
the	O
root	O
node	O
of	O
the	O
Open	B-Architecture
Firmware	I-Architecture
device	O
tree	O
.	O
</s>
<s>
The	O
New	B-Device
World	I-Device
ROM	I-Device
also	O
sets	O
the	O
"	O
compatible	O
"	O
property	O
of	O
the	O
root	O
node	O
to	O
"	O
MacRISC2	O
"	O
(	O
machines	O
that	O
can	O
boot	O
Classic	O
Mac	B-Device
OS	O
using	O
"	O
Mac	B-Device
OS	O
ROM	B-Device
"	O
)	O
or	O
"	O
MacRISC3	O
"	O
(	O
machines	O
that	O
can	O
only	O
boot	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
or	O
another	O
Unix-like	B-Operating_System
system	I-Operating_System
)	O
.	O
</s>
<s>
It	O
is	O
somewhat	O
easier	O
to	O
boot	O
a	O
non-Mac-OS	O
operating	O
system	O
on	O
a	O
New	O
World	O
system	O
,	O
and	O
indeed	O
OpenBSD	B-Operating_System
's	O
bootloader	B-Application
only	O
works	O
on	O
a	O
New	O
World	O
system	O
.	O
</s>
<s>
The	O
simplest	O
way	O
to	O
distinguish	O
a	O
New	B-Device
World	I-Device
ROM	I-Device
Mac	B-Device
is	O
that	O
it	O
will	O
have	O
a	O
factory	O
built-in	O
USB	B-Protocol
port	O
.	O
</s>
<s>
No	O
Old	B-Device
World	I-Device
ROM	I-Device
Mac	B-Device
had	O
a	O
USB	B-Protocol
port	O
as	O
factory	O
equipment	O
;	O
instead	O
,	O
they	O
used	O
ADB	B-Device
for	O
keyboard	O
and	O
mouse	O
,	O
and	O
mini-DIN-8	O
"	O
modem	O
"	O
and	O
"	O
printer	O
"	O
serial	O
ports	O
for	O
other	O
peripherals	O
.	O
</s>
<s>
Also	O
,	O
New	B-Device
World	I-Device
ROM	I-Device
Macs	B-Device
generally	O
do	O
not	O
have	O
a	O
built-in	O
floppy	B-Device
drive	I-Device
.	O
</s>
