<s>
The	O
Macintosh	B-Device
IIfx	I-Device
is	O
a	O
personal	B-Device
computer	I-Device
designed	O
,	O
manufactured	O
and	O
sold	O
by	O
Apple	O
Computer	O
from	O
March	O
1990	O
to	O
April	O
1992	O
.	O
</s>
<s>
At	O
introduction	O
it	O
cost	O
from	O
to	O
,	O
depending	O
on	O
configuration	O
,	O
and	O
it	O
was	O
the	O
fastest	O
Macintosh	B-Device
available	O
at	O
the	O
time	O
.	O
</s>
<s>
The	O
IIfx	O
is	O
the	O
most	O
powerful	O
of	O
the	O
68030-based	O
Macintosh	B-Device
II	I-Device
family	I-Device
and	O
was	O
replaced	O
at	O
the	O
top	O
of	O
Apple	O
's	O
lineup	O
by	O
the	O
Macintosh	B-Device
Quadra	I-Device
in	O
1991	O
.	O
</s>
<s>
Dubbed	O
"	O
Wicked	O
Fast	O
"	O
by	O
its	O
Product	O
Manager	O
,	O
Frank	O
Casanova	O
–	O
who	O
came	O
to	O
Apple	O
from	O
Apollo	O
Computer	O
in	O
Boston	O
,	O
Massachusetts	O
,	O
where	O
the	O
Boston	O
term	O
"	O
wicked	O
"	O
is	O
commonly	O
used	O
to	O
denote	O
anything	O
extreme	O
–	O
the	O
IIfx	O
runs	O
at	O
a	O
clock	O
rate	O
of	O
40	O
megahertz	O
,	O
has	O
32	O
KB	O
of	O
Level	O
2	O
cache	B-General_Concept
,	O
six	O
NuBus	B-Device
slots	O
,	O
and	O
includes	O
a	O
number	O
of	O
proprietary	O
ASICs	O
and	O
coprocessors	O
.	O
</s>
<s>
The	O
40MHz	O
speed	O
refers	O
to	O
the	O
main	O
logic	O
board	O
clock	O
(	O
the	O
bus	O
)	O
,	O
the	O
Motorola	B-Device
68030	I-Device
CPU	B-General_Concept
,	O
and	O
the	O
computer	O
's	O
Motorola	B-General_Concept
68882	I-General_Concept
FPU	B-General_Concept
.	O
</s>
<s>
The	O
machine	O
has	O
eight	O
RAM	B-Architecture
slots	O
,	O
for	O
a	O
maximum	O
of	O
128	O
MB	O
RAM	B-Architecture
,	O
an	O
enormous	O
amount	O
at	O
the	O
time	O
.	O
</s>
<s>
The	O
IIfx	O
features	O
specialized	O
high-speed	O
(	O
80	O
ns	O
)	O
RAM	B-Architecture
using	O
64-pin	O
dual-ported	O
SIMMs	O
,	O
while	O
all	O
other	O
contemporary	O
Macintosh	B-Device
models	O
use	O
30-pin	O
SIMMs	O
.	O
</s>
<s>
It	O
is	O
also	O
possible	O
to	O
use	O
parity	B-Error_Name
memory	O
modules	O
;	O
the	O
IIfx	O
is	O
the	O
only	O
stock	O
68K	O
Macintosh	B-Device
to	O
support	O
them	O
along	O
with	O
special	O
versions	O
of	O
the	O
Macintosh	B-Device
IIci	I-Device
.	O
</s>
<s>
The	O
logic	O
board	O
has	O
a	O
total	O
of	O
8	O
RAM	B-Architecture
slots	O
;	O
these	O
must	O
be	O
populated	O
four	O
at	O
a	O
time	O
with	O
1	O
,	O
4	O
,	O
or	O
16	O
MB	O
chips	O
;	O
this	O
results	O
in	O
a	O
maximum	O
memory	O
amount	O
of	O
128	O
MB	O
.	O
</s>
<s>
The	O
IIfx	O
includes	O
two	O
special	O
dedicated	O
processors	O
for	O
floppy	O
disk	O
operations	O
,	O
sound	O
,	O
ADB	O
,	O
and	O
serial	B-Protocol
communications	I-Protocol
.	O
</s>
<s>
These	O
I/O	O
chips	O
feature	O
a	O
pair	O
of	O
10MHz	O
embedded	B-Architecture
6502	B-General_Concept
CPUs	O
,	O
which	O
is	O
the	O
same	O
CPU	B-General_Concept
family	O
used	O
in	O
Apple	B-Device
II	I-Device
machines	O
.	O
</s>
<s>
The	O
IIfx	O
uses	O
SCSI	B-Architecture
as	O
its	O
hard	B-Device
disk	I-Device
interface	O
,	O
as	O
had	O
all	O
previous	O
Macintosh	B-Device
models	O
since	O
the	O
Macintosh	B-Device
Plus	I-Device
.	O
</s>
<s>
The	O
IIfx	O
requires	O
a	O
special	O
black-colored	O
SCSI	B-Architecture
terminator	O
for	O
external	O
drives	O
.	O
</s>
<s>
Macintosh	B-Device
IIfx	I-Device
:	O
4	O
MB	O
memory	O
,	O
1.44	O
MB	O
SuperDrive	B-Device
.	O
</s>
<s>
Macintosh	B-Device
IIfx	I-Device
4/80	O
:	O
4	O
MB	O
memory	O
,	O
80	O
MB	O
HDD	O
.	O
</s>
<s>
Macintosh	B-Device
IIfx	I-Device
4/160	O
:	O
4	O
MB	O
memory	O
,	O
160	O
MB	O
HDD	O
.	O
</s>
<s>
Macintosh	B-Device
IIfx	I-Device
4/80	O
with	O
Parity	B-Error_Name
Support	O
:	O
4	O
MB	O
of	O
parity	B-Error_Name
error-checking	I-Error_Name
RAM	B-Architecture
,	O
80	O
MB	O
HDD	O
.	O
</s>
<s>
Macintosh	B-Device
IIfx	I-Device
4/80	O
with	O
A/UX	B-Operating_System
:	O
4	O
MB	O
memory	O
,	O
160	O
MB	O
HDD	O
,	O
A/UX	B-Operating_System
2.0	O
preinstalled	O
.	O
</s>
