<s>
The	O
IBM	B-Device
3720	I-Device
was	O
a	O
communications	O
controller	O
(	O
front-end	B-General_Concept
processor	I-General_Concept
)	O
made	O
by	O
IBM	O
,	O
suitable	O
for	O
use	O
with	O
IBM	B-Device
System/390	I-Device
.	O
</s>
<s>
Official	O
service	O
support	O
was	O
withdrawn	O
in	O
1999	O
in	O
favour	O
of	O
the	O
IBM	B-Device
3745	I-Device
.	O
</s>
<s>
The	O
IBM	B-Device
3720	I-Device
is	O
unrelated	O
to	O
the	O
similarly-numbered	O
IBM	B-Operating_System
3270	I-Operating_System
display	O
terminal	O
system	O
.	O
</s>
