<s>
MODE32	B-Application
is	O
a	O
software	O
product	O
originally	O
developed	O
by	O
Connectix	O
for	O
certain	O
models	O
of	O
the	O
Apple	B-Device
Macintosh	I-Device
.	O
</s>
<s>
MODE32	B-Application
patches	O
the	O
ROM	B-Device
code	O
in	O
certain	O
models	O
of	O
early	O
68020	B-Device
and	O
68030	B-Device
Apple	B-Device
Macintosh	I-Device
computers	I-Device
(	O
see	O
"	O
Affected	O
models	O
"	O
below	O
)	O
which	O
were	O
advertised	O
by	O
Apple	O
to	O
support	O
32-bit	O
memory	O
management	O
.	O
</s>
<s>
Despite	O
the	O
machines	O
 '	O
hardware	O
being	O
designed	O
to	O
support	O
32-bit	O
mode	O
,	O
the	O
lack	O
of	O
a	O
32-bit	O
Memory	O
Manager	O
in	O
ROM	B-Device
forced	O
these	O
machines	O
to	O
run	O
in	O
24-bit	O
mode	O
,	O
which	O
crippled	O
these	O
otherwise	O
high-end	O
machines	O
to	O
support	O
only	O
8	O
MB	O
of	O
RAM	B-Architecture
.	O
</s>
<s>
Prior	O
to	O
licensing	O
MODE32	B-Application
,	O
Apple	O
had	O
been	O
subject	O
to	O
many	O
complaints	O
from	O
individuals	O
over	O
the	O
lack	O
of	O
32-bit	O
support	O
.	O
</s>
<s>
Versions	O
of	O
MODE32	B-Application
prior	O
to	O
7.5	O
include	O
a	O
control	B-Operating_System
panel	I-Operating_System
under	O
Macintosh	B-Operating_System
System	I-Operating_System
7	I-Operating_System
that	O
lets	O
the	O
user	O
enable	O
or	O
disable	O
MODE32	B-Application
.	O
</s>
<s>
The	O
option	O
to	O
enable	O
32-bit	O
addressing	O
can	O
be	O
found	O
in	O
the	O
Memory	O
control	B-Operating_System
panel	I-Operating_System
when	O
MODE32	B-Application
is	O
enabled	O
.	O
</s>
<s>
For	O
System	O
7.0	O
and	O
7.1	O
,	O
MODE32	B-Application
version	O
1.2	O
was	O
recommended	O
.	O
</s>
<s>
In	O
the	O
case	O
of	O
System	O
7.5	O
(	O
and	O
if	O
Thread	O
Manager	O
was	O
loaded	O
)	O
,	O
Connectix	O
specifically	O
recommends	O
MODE32	B-Application
7.5	O
in	O
order	O
to	O
avoid	O
problems	O
with	O
file	O
corruption	O
.	O
</s>
<s>
If	O
MODE32	B-Application
1.2	O
was	O
installed	O
over	O
7.5	O
,	O
Connectix	O
recommends	O
a	O
complete	O
reinstall	O
of	O
the	O
operating	O
system	O
.	O
</s>
<s>
Generally	O
,	O
32-bit	O
addressing	O
is	O
only	O
needed	O
when	O
large	O
amounts	O
of	O
RAM	B-Architecture
are	O
needed	O
or	O
when	O
a	O
piece	O
of	O
software	O
requires	O
it	O
.	O
</s>
<s>
Running	O
non-32-bit-clean	O
software	O
in	O
32-bit	O
mode	O
on	O
any	O
Macintosh	B-Device
can	O
cause	O
crashes	B-General_Concept
and	O
data	O
corruption	O
.	O
</s>
<s>
With	O
MODE32	B-Application
installed	O
,	O
holding	O
down	O
the	O
Esc	O
key	O
on	O
the	O
keyboard	O
as	O
soon	O
as	O
the	O
machine	O
is	O
powered	O
on	O
causes	O
the	O
system	O
to	O
run	O
in	O
24-bit	O
mode	O
for	O
the	O
current	O
session	O
.	O
</s>
<s>
MODE32	B-Application
is	O
a	O
descendant	O
of	O
Connectix	O
's	O
earlier	O
OPTIMA	O
,	O
which	O
also	O
enables	O
32-bit	O
addressing	O
but	O
for	O
System	O
6	O
.	O
</s>
<s>
Connectix	O
also	O
offered	O
three	O
similar	O
products	O
,	O
MAXIMA	O
,	O
RAM	B-Architecture
Doubler	O
,	O
and	O
Virtual	O
;	O
the	O
former	O
implemented	O
a	O
RAM	B-Application
disk	I-Application
and	O
latter	O
two	O
adding	O
virtual	B-Architecture
memory	I-Architecture
(	O
with	O
compression	B-General_Concept
in	O
RAM	B-Architecture
Doubler	O
's	O
case	O
)	O
in	O
addition	O
to	O
allowing	O
addressing	O
14	O
MB	O
under	O
24-bit	O
addressing	O
.	O
</s>
<s>
Other	O
models	O
do	O
not	O
need	O
MODE32	B-Application
because	O
they	O
either	O
do	O
not	O
support	O
32-bit	O
addressing	O
at	O
all	O
or	O
support	O
it	O
exclusively	O
.	O
</s>
