<s>
IBM	B-Device
System/3X	I-Device
was	O
a	O
line	O
of	O
general	O
business	O
midrange	B-Device
computers	I-Device
that	O
were	O
developed	O
and	O
marketed	O
by	O
IBM	O
beginning	O
in	O
1975	O
.	O
</s>
<s>
The	O
IBM	B-Device
AS/400	I-Device
,	O
a	O
successor	O
system	O
that	O
was	O
introduced	O
in	O
1988	O
,	O
was	O
based	O
on	O
a	O
combination	O
of	O
the	O
System/36	B-Device
and	O
System/38	B-Device
computers	O
.	O
</s>
<s>
The	O
IBM	B-Application
i	I-Application
operating	O
system	O
running	O
on	O
top	O
of	O
IBM	B-Device
Power	I-Device
Systems	I-Device
maintains	O
backwards	O
compatibility	O
with	O
some	O
of	O
the	O
System/3x	O
series	O
operating	O
systems	O
.	O
</s>
