<s>
A	O
compatibility	B-Device
card	I-Device
is	O
an	O
expansion	B-Device
card	I-Device
for	O
computers	O
that	O
allows	O
it	O
to	O
have	O
hardware	O
emulation	O
with	O
another	O
device	O
.	O
</s>
<s>
While	O
compatibility	B-Device
cards	I-Device
date	O
back	O
at	O
least	O
to	O
the	O
Apple	B-Device
II	I-Device
family	I-Device
,	O
the	O
majority	O
of	O
them	O
were	O
made	O
for	O
16-bit	O
computers	O
,	O
often	O
to	O
maintain	O
compatibility	O
with	O
the	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
The	O
most	O
popular	O
of	O
these	O
were	O
for	O
Macintosh	B-Device
systems	O
that	O
allowed	O
them	O
to	O
emulate	O
Windows	B-Application
PCs	I-Application
via	O
NuBus	B-Device
or	O
PCI	B-Protocol
;	O
Apple	O
had	O
released	O
several	O
such	O
cards	O
themselves	O
.	O
</s>
<s>
The	O
Z-80	B-Device
SoftCard	I-Device
made	O
the	O
Apple	B-Device
II	I-Device
and	O
Apple	B-Device
II	I-Device
Plus	O
compatible	O
with	O
CP/M	B-Application
by	O
way	O
of	O
a	O
Zilog	B-General_Concept
Z80	I-General_Concept
processor	O
,	O
and	O
was	O
followed	O
up	O
by	O
the	O
Premium	B-Device
SoftCard	I-Device
IIe	I-Device
for	O
the	O
Apple	B-Device
IIe	I-Device
.	O
</s>
<s>
AST	O
Research	O
released	O
the	O
Mac86	O
as	O
a	O
PDS	B-Device
expansion	O
for	O
the	O
Macintosh	B-Device
SE	I-Device
,	O
giving	O
it	O
DOS	O
compatibility	O
through	O
a	O
10	O
MHz	O
8086	O
processor	O
.	O
</s>
<s>
It	O
was	O
followed	O
up	O
by	O
the	O
Mac286	B-Device
,	O
which	O
added	O
a	O
286	O
processor	O
through	O
the	O
Macintosh	B-Device
II	I-Device
's	O
NuBus	B-Device
slots	O
.	O
</s>
<s>
Orange	O
Micro	O
's	O
OrangePC	O
series	O
of	O
cards	O
were	O
the	O
spiritual	O
successor	O
to	O
the	O
Mac86	O
and	O
Mac286	B-Device
.	O
</s>
<s>
These	O
cards	O
provided	O
support	O
for	O
386	O
,	O
486	O
,	O
and	O
Pentium	B-General_Concept
processors	O
,	O
up	O
to	O
a	O
400	O
MHz	O
AMD	O
K6-2	O
processor	O
in	O
the	O
final	O
model	O
.	O
</s>
<s>
Orange	O
Micro	O
also	O
released	O
the	O
PCfx	O
!,	O
a	O
cut	O
down	O
OrangePC	O
board	O
with	O
a	O
200	O
MHz	O
Pentium	B-General_Concept
soldered	O
on	O
.	O
</s>
<s>
Reply	O
Corporation	O
's	O
DOS	O
on	O
Mac	O
series	O
of	O
cards	O
added	O
a	O
486/5x86	O
(	O
up	O
to	O
100	O
MHz	O
)	O
processor	O
and	O
DOS	O
compatibility	O
to	O
Centris	O
,	O
Quadra	O
,	O
Performa	O
,	O
and	O
Power	O
Macintoshes	B-Device
through	O
a	O
PDS	B-Device
expansion	O
;	O
later	O
models	O
supported	O
PCI-based	O
Power	O
Macs	O
and	O
Pentium	B-General_Concept
processors	O
up	O
to	O
200	O
MHz	O
.	O
</s>
<s>
An	O
updated	O
DOS	O
compatibility	B-Device
card	I-Device
with	O
a	O
40	O
MHz	O
486SX	B-Device
(	O
underclocked	O
to	O
33	O
MHz	O
)	O
was	O
available	O
as	O
an	O
upgrade	O
for	O
the	O
Archimedes	O
 '	O
successor	O
,	O
the	O
Risc	B-Device
PC	I-Device
.	O
</s>
