<s>
The	O
Personal	B-Device
System/2	I-Device
or	O
PS/2	B-Device
was	O
a	O
line	O
of	O
personal	B-Device
computers	I-Device
developed	O
by	O
International	O
Business	O
Machines	O
(	O
IBM	O
)	O
.	O
</s>
<s>
Released	O
in	O
1987	O
,	O
the	O
PS/2	B-Device
represented	O
IBM	O
's	O
second	O
generation	O
of	O
personal	B-Device
computer	I-Device
following	O
the	O
original	O
IBM	B-Device
PC	I-Device
series	O
,	O
which	O
was	O
retired	O
following	O
IBM	O
's	O
announcement	O
of	O
the	O
PS/2	B-Device
in	O
April	O
1987	O
.	O
</s>
<s>
Most	O
PS/2s	B-Device
featured	O
the	O
Micro	B-Device
Channel	I-Device
architecture	I-Device
bus	O
—	O
a	O
proprietary	O
standard	O
which	O
was	O
IBM	O
's	O
attempt	O
at	O
recapturing	O
control	O
of	O
the	O
PC	O
market	O
.	O
</s>
<s>
However	O
some	O
PS/2	B-Device
models	O
at	O
the	O
low	O
end	O
featured	O
ISA	B-Architecture
buses	O
,	O
which	O
IBM	O
included	O
with	O
their	O
earlier	O
PCs	B-Device
and	O
which	O
were	O
widely	O
cloned	O
due	O
to	O
being	O
a	O
mostly-open	O
standard	O
.	O
</s>
<s>
Many	O
models	O
of	O
PS/2	B-Device
were	O
made	O
,	O
which	O
came	O
in	O
the	O
form	O
of	O
desktops	O
,	O
towers	O
,	O
portables	O
,	O
laptops	O
and	O
notebooks	O
.	O
</s>
