<s>
The	O
IBM	B-Device
5520	I-Device
Administrative	I-Device
System	I-Device
was	O
a	O
text	O
,	O
electronic	O
document‐distribution	O
and	O
data	B-General_Concept
processing	I-General_Concept
system	O
,	O
announced	O
by	O
IBM	O
General	O
Systems	O
Division	O
(	O
GSD	O
)	O
in	O
1979	O
.	O
</s>
<s>
The	O
system	O
offered	O
linked	O
text-editing	O
work	O
stations	O
that	O
shared	O
a	O
storage	O
unit	O
a	O
central	O
processor	O
unit	O
(	O
IBM	O
5525	O
)	O
,	O
CRT-based	O
display	O
stations	O
(	O
IBM	B-Device
5253	I-Device
and	O
5254	B-Device
)	O
,	O
a	O
daisy	O
wheel	O
printer	O
(	O
IBM	B-Device
5257	I-Device
)	O
and	O
an	O
ink	O
jet	O
printer	O
(	O
IBM	B-Device
5258	I-Device
)	O
.	O
</s>
<s>
The	O
processor	O
unit	O
has	O
a	O
same	O
case	O
that	O
used	O
in	O
a	O
IBM	B-Device
System/34	I-Device
midrange	O
computer	O
.	O
</s>
<s>
6670	O
Information	O
Distributor	O
,	O
Office	B-Protocol
System/6	I-Protocol
,	O
6240	O
Mag	O
Card	O
Typewriter-Communicating	O
and	O
System/370	B-Device
could	O
be	O
connected	O
for	O
electronic	O
document	O
distribution	O
.	O
</s>
<s>
While	O
the	O
Office	B-Protocol
System/6	I-Protocol
introduced	O
two	O
years	O
earlier	O
by	O
IBM	O
Office	O
Products	O
Division	O
(	O
OPD	O
)	O
was	O
focused	O
on	O
word	B-General_Concept
processing	I-General_Concept
,	O
the	O
new	O
5520	O
intended	O
to	O
complement	O
existing	O
products	O
lines	O
with	O
text	O
editing	O
and	O
data	B-General_Concept
processing	I-General_Concept
power	O
.	O
</s>
