<s>
The	O
clock	B-Device
port	I-Device
is	O
a	O
commonly	O
used	O
term	O
for	O
the	O
real-time	O
clock	O
interface	O
of	O
the	O
Amiga	B-Application
1200	I-Application
computer	O
.	O
</s>
<s>
However	O
,	O
it	O
was	O
later	O
widely	O
used	O
as	O
a	O
general	O
purpose	O
expansion	O
port	O
by	O
third-party	O
developers	O
for	O
devices	O
,	O
such	O
as	O
,	O
I/O	B-General_Concept
cards	O
,	O
sound	O
cards	O
and	O
even	O
a	O
USB	B-Protocol
controller	O
.	O
</s>
<s>
Although	O
a	O
real-time	O
clock	O
can	O
be	O
connected	O
to	O
the	O
port	O
,	O
the	O
clock	O
was	O
typically	O
added	O
by	O
other	O
means	O
(	O
usually	O
integrated	O
on	O
CPU	O
or	O
RAM	O
expansions	O
)	O
which	O
leave	O
the	O
clock	B-Device
port	I-Device
free	O
.	O
</s>
<s>
The	O
A1200	B-Application
was	O
the	O
only	O
Amiga	O
model	O
to	O
have	O
this	O
unique	O
22-pin	O
connector	O
(	O
some	O
revisions	O
of	O
the	O
A1200	B-Application
motherboard	O
have	O
additional	O
non-functional	O
pins	O
)	O
.	O
</s>
<s>
However	O
,	O
as	O
the	O
address	O
and	O
data	O
signals	O
used	O
by	O
the	O
interface	O
are	O
available	O
through	O
the	O
internal	O
expansion	O
connectors	O
of	O
other	O
Amiga	O
models	O
,	O
clock	B-Device
port	I-Device
adaptors	O
were	O
later	O
created	O
by	O
third-party	O
developers	O
for	O
these	O
systems	O
.	O
</s>
<s>
This	O
enables	O
owners	O
of	O
other	O
popular	O
models	O
,	O
such	O
as	O
the	O
Amiga	B-Device
500	I-Device
or	O
Amiga	B-Device
600	I-Device
,	O
to	O
use	O
the	O
hardware	O
created	O
for	O
this	O
interface	O
.	O
</s>
<s>
Due	O
to	O
the	O
popularity	O
of	O
clock	B-Device
port	I-Device
devices	O
,	O
developers	O
even	O
included	O
one	O
or	O
more	O
compatible	O
clock	B-Device
port	I-Device
interfaces	O
on	O
Amiga	O
Zorro	B-Device
boards	O
to	O
allow	O
hosting	O
such	O
devices	O
on	O
these	O
systems	O
.	O
</s>
