<s>
Old	B-Device
World	I-Device
ROM	I-Device
computers	O
are	O
the	O
Macintosh	B-Device
(	O
Mac	B-Device
)	O
models	O
that	O
use	O
a	O
Macintosh	B-Device
Toolbox	I-Device
read-only	B-Device
memory	I-Device
(	O
ROM	B-Device
)	O
chip	O
,	O
usually	O
in	O
a	O
socket	O
(	O
but	O
soldered	O
to	O
the	O
motherboard	O
in	O
some	O
models	O
)	O
.	O
</s>
<s>
All	O
Macs	B-Device
prior	O
to	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	O
G3	O
use	O
Old	B-Device
World	I-Device
ROM	I-Device
,	O
while	O
said	O
models	O
,	O
as	O
well	O
as	O
all	O
subsequent	O
models	O
until	O
the	O
introduction	O
of	O
the	O
Intel-based	O
EFI	O
Models	O
,	O
are	O
New	B-Device
World	I-Device
ROM	I-Device
machines	O
.	O
</s>
<s>
In	O
particular	O
,	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-colored	O
Power	B-Device
Macs	I-Device
are	O
Old	B-Device
World	I-Device
ROM	I-Device
machines	O
.	O
</s>
<s>
In	O
common	O
use	O
,	O
the	O
"	O
Old	O
World	O
"	O
designation	O
usually	O
applies	O
to	O
the	O
early	O
generations	O
of	O
PCI-based	O
"	O
beige	O
"	O
Power	B-Device
Macs	I-Device
(	O
and	O
sometimes	O
the	O
first	O
NuBus-equipped	O
models	O
)	O
,	O
but	O
not	O
the	O
older	O
Motorola	O
68000-based	O
Macs	B-Device
;	O
however	O
,	O
the	O
Toolbox	O
runs	O
the	O
same	O
way	O
on	O
all	O
three	O
types	O
of	O
machines	O
.	O
</s>
<s>
PCI	B-Protocol
Power	B-Device
Macs	I-Device
with	O
an	O
Old	B-Device
World	I-Device
ROM	I-Device
contain	O
an	O
Open	B-Architecture
Firmware	I-Architecture
implementation	O
,	O
and	O
a	O
copy	O
of	O
the	O
Macintosh	B-Device
Toolbox	I-Device
as	O
an	O
Open	B-Architecture
Firmware	I-Architecture
device	O
.	O
</s>
<s>
These	O
machines	O
are	O
set	O
to	O
boot	O
from	O
this	O
device	O
by	O
default	O
,	O
thus	O
starting	O
the	O
normal	O
Macintosh	B-Device
startup	O
procedure	O
.	O
</s>
<s>
This	O
can	O
be	O
changed	O
,	O
just	O
as	O
on	O
New	B-Device
World	I-Device
ROM	I-Device
Macs	B-Device
,	O
but	O
with	O
limitations	O
placed	O
on	O
what	O
devices	O
and	O
formats	O
can	O
be	O
used	O
;	O
on	O
these	O
machines	O
,	O
particularly	O
the	O
early	O
machines	O
like	O
the	O
Power	B-Device
Macintosh	I-Device
9500	I-Device
,	O
the	O
Open	B-Architecture
Firmware	I-Architecture
implementation	O
was	O
just	O
enough	O
to	O
enumerate	O
PCI	B-Protocol
devices	O
and	O
load	O
the	O
Toolbox	B-Device
ROM	I-Device
,	O
and	O
these	O
Open	B-Architecture
Firmware	I-Architecture
revisions	O
have	O
several	O
bugs	O
which	O
must	O
be	O
worked	O
around	O
by	O
boot	B-Application
loaders	I-Application
or	O
nvramrc	O
patches	O
.	O
</s>
<s>
The	O
Open	B-Architecture
Firmware	I-Architecture
environment	O
can	O
be	O
entered	O
by	O
holding	O
the	O
key	O
combination	O
while	O
booting	O
.	O
</s>
<s>
All	O
Power	B-Device
Macs	I-Device
emulate	B-Device
a	O
68LC040	O
CPU	O
inside	O
a	O
nanokernel	O
;	O
this	O
emulator	O
is	O
then	O
used	O
to	O
boot	O
the	O
predominantly	O
68k-based	O
Toolbox	O
,	O
and	O
is	O
also	O
used	O
to	O
support	O
applications	O
written	O
for	O
the	O
68k	O
processor	O
.	O
</s>
<s>
Once	O
Toolbox	O
is	O
running	O
,	O
PPC	O
machines	O
can	O
boot	O
into	O
Mac	B-Device
OS	O
directly	O
.	O
</s>
<s>
On	O
all	O
Old	B-Device
World	I-Device
ROM	I-Device
machines	O
,	O
once	O
Toolbox	O
is	O
loaded	O
,	O
the	O
boot	O
procedure	O
is	O
the	O
same	O
.	O
</s>
<s>
Toolbox	O
executes	O
a	O
memory	O
test	O
,	O
enumerates	O
Mac	B-Device
OS	O
devices	O
it	O
knows	O
about	O
(	O
this	O
varies	O
from	O
model	O
to	O
model	O
)	O
,	O
and	O
either	O
starts	O
the	O
on-board	O
video	O
(	O
if	O
present	O
)	O
or	O
the	O
option	O
ROM	B-Device
on	O
a	O
NuBus	B-Device
or	O
PCI	B-Protocol
video	O
card	O
.	O
</s>
<s>
Toolbox	O
then	O
checks	O
for	O
a	O
disk	O
in	O
the	O
floppy	O
drive	O
,	O
and	O
scans	O
all	O
SCSI	O
buses	O
for	O
a	O
disk	O
with	O
a	O
valid	O
System	O
Folder	O
,	O
giving	O
preference	O
to	O
whatever	O
disk	O
is	O
set	O
as	O
the	O
startup	O
disk	O
in	O
the	O
parameter	B-General_Concept
RAM	I-General_Concept
.	O
</s>
<s>
If	O
a	O
bootable	O
disk	O
is	O
found	O
,	O
the	O
Happy	O
Mac	B-Device
logo	O
is	O
displayed	O
,	O
and	O
control	O
is	O
handed	O
over	O
to	O
the	O
Mac	B-Device
OS	O
.	O
</s>
<s>
If	O
a	O
hardware	O
problem	O
occurs	O
during	O
the	O
early	O
part	O
of	O
the	O
boot	O
process	O
,	O
the	O
machine	O
will	O
display	O
the	O
Sad	O
Mac	B-Device
icon	O
with	O
a	O
hexadecimal	O
error	O
code	O
and	O
freeze	O
;	O
on	O
Macs	B-Device
made	O
after	O
1987	O
,	O
this	O
will	O
be	O
accompanied	O
by	O
the	O
Chimes	O
of	O
Death	O
sound	O
.	O
</s>
<s>
Since	O
the	O
Old	B-Device
World	I-Device
ROM	I-Device
usually	O
boots	O
to	O
Toolbox	O
,	O
most	O
OSs	O
have	O
to	O
be	O
installed	O
using	O
a	O
boot	B-Application
loader	I-Application
from	O
inside	O
Mac	B-Device
OS	O
(	O
BootX	B-Application
is	O
commonly	O
used	O
for	O
Linux	B-Application
installations	O
)	O
.	O
</s>
<s>
68K-based	O
Macs	B-Device
and	O
NuBus	B-Device
Power	B-Device
Macs	I-Device
must	O
have	O
Mac	B-Device
OS	O
installed	O
to	O
load	O
another	O
OS	O
(	O
even	O
A/UX	B-Operating_System
,	O
which	O
was	O
an	O
Apple	O
product	O
)	O
,	O
usually	O
with	O
virtual	B-Architecture
memory	I-Architecture
turned	O
off	O
.	O
</s>
<s>
PCI	B-Protocol
Power	B-Device
Macs	I-Device
can	O
be	O
configured	O
to	O
boot	O
into	O
Open	B-Architecture
Firmware	I-Architecture
,	O
allowing	O
the	O
firmware	O
to	O
load	O
a	O
boot	B-Application
loader	I-Application
directly	O
,	O
or	O
they	O
can	O
use	O
a	O
specially-prepared	O
floppy	O
disk	O
to	O
trick	O
the	O
Toolbox	O
into	O
loading	O
a	O
kernel	O
(	O
this	O
is	O
used	O
for	O
Linux	B-Application
installation	O
floppy	O
images	O
)	O
.	O
</s>
<s>
The	O
simplest	O
way	O
to	O
identify	O
an	O
Old	B-Device
World	I-Device
ROM	I-Device
Mac	B-Device
is	O
that	O
it	O
will	O
not	O
have	O
a	O
factory	O
built-in	O
USB	O
port	O
.	O
</s>
<s>
Only	O
New	B-Device
World	I-Device
ROM	I-Device
Macs	B-Device
featured	O
a	O
USB	O
port	O
as	O
factory	O
equipment	O
.	O
</s>
