<s>
The	O
Apple	B-Device
Communication	I-Device
Slot	I-Device
,	O
or	O
Comm	B-Device
Slot	I-Device
,	O
is	O
an	O
internal	O
expansion	O
data	O
interface	O
(	O
slot	O
)	O
found	O
in	O
Apple	B-Device
Macintosh	I-Device
computers	I-Device
from	O
the	O
early	O
to	O
mid-1990s	O
.	O
</s>
<s>
It	O
was	O
designed	O
as	O
an	O
inexpensive	O
way	O
to	O
add	O
communication	O
expansion	B-Device
cards	I-Device
like	O
network	B-Protocol
adapters	I-Protocol
or	O
modems	B-Application
to	O
Macs	B-Device
and	O
Power	B-Device
Macs	I-Device
.	O
</s>
<s>
The	O
original	O
Communication	B-Device
Slot	I-Device
standard	O
was	O
introduced	O
in	O
the	O
Macintosh	B-Device
LC	O
575	O
and	O
can	O
be	O
identified	O
by	O
the	O
notch	O
toward	O
its	O
rear	O
.	O
</s>
<s>
This	O
slot	O
is	O
based	O
on	O
the	O
LC	B-Device
PDS	I-Device
.	O
</s>
<s>
An	O
updated	O
PCI-based	O
Communication	B-Device
Slot	I-Device
II	O
debuted	O
with	O
the	O
Performa	O
6360	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
respective	O
expansion	B-Device
bus	I-Device
pins	O
,	O
these	O
slots	O
also	O
carried	O
audio	O
and	O
serial	O
lines	O
.	O
</s>
<s>
The	O
serial	O
bus	O
was	O
shared	O
with	O
the	O
external	B-Application
modem	I-Application
port	O
.	O
</s>
<s>
Because	O
the	O
power	O
and	O
serial	O
pins	O
remained	O
unchanged	O
between	O
the	O
two	O
slots	O
,	O
it	O
was	O
possible	O
to	O
design	O
a	O
universal	O
modem	B-Application
card	O
which	O
could	O
work	O
in	O
either	O
.	O
</s>
<s>
Network	B-Protocol
adapters	I-Protocol
,	O
however	O
,	O
needed	O
to	O
be	O
designed	O
for	O
one	O
or	O
the	O
other	O
.	O
</s>
<s>
A	O
major	O
disadvantage	O
to	O
both	O
is	O
that	O
when	O
a	O
modem	B-Application
card	O
is	O
installed	O
in	O
the	O
Communication	B-Device
Slot	I-Device
,	O
the	O
modem	B-Application
serial	O
port	O
on	O
the	O
back	O
of	O
the	O
computer	O
is	O
disabled	O
.	O
</s>
<s>
Computers	O
that	O
came	O
with	O
this	O
card	O
installed	O
had	O
the	O
modem	B-Application
port	O
blanked	O
out	O
(	O
though	O
the	O
connector	O
was	O
still	O
present	O
)	O
.	O
</s>
<s>
Further	O
,	O
due	O
to	O
its	O
unconventional	O
architecture	O
,	O
the	O
Performa	O
5200	O
's	O
printer	O
port	O
would	O
be	O
disabled	O
if	O
a	O
network	B-Protocol
adapter	I-Protocol
was	O
installed	O
in	O
the	O
Communication	B-Device
Slot	I-Device
.	O
</s>
<s>
A	O
Communication	B-Device
Slot	I-Device
(	O
some	O
documentation	O
refers	O
to	O
this	O
as	O
a	O
Communication	O
Card	O
I	O
Slot	O
)	O
is	O
found	O
in	O
some	O
68040	O
and	O
PowerPC	O
CPU	O
Macs	B-Device
.	O
</s>
<s>
The	O
Communication	B-Device
Slot	I-Device
II	O
was	O
used	O
in	O
the	O
6360	O
and	O
later	O
series	O
of	O
Power	B-Device
Macs	I-Device
and	O
Performas	O
.	O
</s>
<s>
In	O
addition	O
,	O
a	O
modified	O
Communication	B-Device
Slot	I-Device
II	O
was	O
present	O
on	O
the	O
Power	B-Device
Macintosh	I-Device
G3	I-Device
personality	O
cards	O
.	O
</s>
<s>
This	O
slot	O
only	O
provided	O
power	O
and	O
serial	O
lines	O
,	O
leaving	O
the	O
PCI	B-Protocol
pins	O
disconnected	O
.	O
</s>
<s>
For	O
this	O
reason	O
it	O
could	O
only	O
be	O
used	O
with	O
modem	B-Application
cards	O
.	O
</s>
<s>
As	O
in	O
other	O
machines	O
,	O
the	O
external	B-Application
modem	I-Application
port	O
is	O
disabled	O
when	O
a	O
modem	B-Application
is	O
installed	O
in	O
the	O
Communication	B-Device
Slot	I-Device
.	O
</s>
