<s>
In	O
marketing	O
,	O
iAPX	B-Device
(	O
Intel	B-Device
Advanced	I-Device
Performance	I-Device
Architecture	I-Device
with	O
X	O
standing	O
in	O
for	O
the	O
Greek	O
letter	O
χ	O
(	O
chi	O
)	O
,	O
romanised	O
as	O
"	O
ch	O
"	O
)	O
was	O
a	O
short	O
lived	O
designation	O
used	O
for	O
several	O
Intel	O
microprocessors	O
,	O
including	O
some	O
8086	B-General_Concept
family	O
processors	O
.	O
</s>
<s>
Not	O
being	O
a	O
simple	O
initialism	O
seems	O
to	O
have	O
confused	O
even	O
Intel	O
's	O
technical	O
writers	O
as	O
can	O
be	O
seen	O
in	O
their	O
iAPX-88	O
Book	O
where	O
the	O
asterisked	O
expansion	O
shows	O
iAPX	B-Device
to	O
mean	O
Intel	B-Device
Advanced	I-Device
Processor	I-Device
System	I-Device
.	O
</s>
<s>
The	O
iAPX	B-Device
prefix	O
originally	O
belonged	O
to	O
the	O
Intel	B-Device
iAPX	I-Device
432	I-Device
architecture	O
,	O
alias	O
Intel	O
8800	O
.	O
</s>
<s>
However	O
,	O
as	O
this	O
radical	O
design	O
failed	O
in	O
the	O
marketplace	O
,	O
Intel	O
also	O
tried	O
it	O
on	O
its	O
more	O
conventional	O
8086-family	O
of	O
processors	O
,	O
mainly	O
used	O
as	O
a	O
kind	O
of	O
system	O
prefix	O
but	O
also	O
to	O
denote	O
individual	O
processors	O
in	O
the	O
family	O
.	O
</s>
<s>
The	O
8086	B-General_Concept
based	O
line	O
was	O
therefore	O
called	O
the	O
iAPX	B-General_Concept
86	I-General_Concept
series	O
for	O
a	O
few	O
years	O
during	O
the	O
early	O
1980s	O
.	O
</s>
<s>
The	O
industry	O
around	O
the	O
8088	B-Device
-	O
and	O
80286-based	O
de	O
facto	O
standard	O
of	O
IBM	B-Device
PC	I-Device
and	O
IBM	B-Operating_System
AT	I-Operating_System
designs	O
also	O
seldom	O
used	O
that	O
naming	O
scheme	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
the	O
iAPX	B-Device
prefix	O
is	O
now	O
,	O
again	O
,	O
more	O
closely	O
associated	O
with	O
the	O
(	O
non-x86	O
)	O
iAPX	B-Device
432	I-Device
architecture	O
(	O
which	O
,	O
although	O
a	O
commercial	O
failure	O
,	O
is	O
often	O
seen	O
as	O
historically	O
important	O
)	O
.	O
</s>
