<s>
PCI	B-Device
IDE	I-Device
ISA	I-Device
Xcelerator	I-Device
(	O
PIIX	B-Device
)	O
,	O
also	O
known	O
as	O
Intel	B-Device
82371	I-Device
,	O
is	O
a	O
family	O
of	O
Intel	O
southbridge	B-Device
microchips	O
employed	O
in	O
some	O
Intel	B-Device
chipsets	I-Device
.	O
</s>
<s>
x86	B-General_Concept
virtualization	I-General_Concept
implementations	O
often	O
support	O
emulations	O
of	O
various	O
PIIX-based	O
chipsets	B-Device
.	O
</s>
<s>
The	O
PIIX	B-Device
integrated	O
an	O
IDE	B-Protocol
controller	O
with	O
two	O
8237	B-Device
DMA	B-General_Concept
controllers	I-General_Concept
,	O
the	O
8254	B-Device
PIT	B-Device
,	O
and	O
two	O
8259	B-Device
PICs	B-Architecture
and	O
a	O
PCI	B-Protocol
to	O
ISA	B-Architecture
bus	I-Architecture
bridge	O
.	O
</s>
<s>
It	O
was	O
introduced	O
with	O
the	O
430FX	O
Triton	O
chipset	B-Device
in	O
1995	O
.	O
</s>
<s>
The	O
mobile	O
version	O
was	O
introduced	O
with	O
the	O
430MX	O
mobile	O
Triton	O
chipset	B-Device
.	O
</s>
<s>
The	O
PIIX3	O
introduced	O
a	O
USB	B-Protocol
1.0	I-Protocol
controller	O
and	O
support	O
for	O
an	O
external	O
I/O	B-Device
APIC	I-Device
.	O
</s>
<s>
It	O
was	O
used	O
with	O
the	O
430HX	B-Device
and	O
430VX	O
Triton	B-Device
II	I-Device
and	O
440FX	B-Device
northbridges	B-Device
.	O
</s>
<s>
The	O
PIIX4	O
introduced	O
ACPI	B-Device
support	O
,	O
an	O
improved	O
IDE	B-Protocol
controller	O
with	O
Ultra	B-Protocol
DMA/33	I-Protocol
or	O
ATA-4	O
support	O
and	O
an	O
integrated	O
a	O
MC146818	O
style	O
RTC	O
and	O
CMOS	B-Device
controller	O
.	O
</s>
<s>
It	O
was	O
used	O
with	O
the	O
430TX	O
and	O
the	O
440LX	B-Device
Balboa	O
northbridges	B-Device
.	O
</s>
<s>
The	O
PIIX4E	O
updated	O
the	O
ACPI	B-Device
support	O
.	O
</s>
<s>
It	O
was	O
mainly	O
used	O
in	O
440BX	B-Device
and	O
440GX	O
chipsets	B-Device
but	O
440EX	O
,	O
440ZX	O
,	O
and	O
450NX	O
chipsets	B-Device
also	O
employed	O
it	O
.	O
</s>
<s>
The	O
mobile	O
version	O
was	O
used	O
in	O
440BX	B-Device
and	O
440ZX-M	O
chipsets	B-Device
.	O
</s>
<s>
This	O
seems	O
to	O
be	O
a	O
reference	O
to	O
the	O
Itanium	B-General_Concept
460GX	O
I/O	O
and	O
Firmware	O
Bridge	O
(	O
IFB	O
)	O
chipset	B-Device
component	O
which	O
has	O
been	O
referred	O
to	O
as	O
82372FB	O
(	O
PIIX5	O
)	O
,	O
82468FB	O
,	O
and	O
finally	O
FW82468GX	O
(	O
IFB	O
)	O
.	O
</s>
