<s>
The	O
IBM	B-Architecture
3790	I-Architecture
Communications	O
System	O
was	O
one	O
of	O
the	O
first	O
distributed	B-Architecture
computing	I-Architecture
platforms	O
.	O
</s>
<s>
It	O
preceded	O
the	O
IBM	B-Device
8100	I-Device
,	O
announced	O
in	O
1979	O
.	O
</s>
<s>
It	O
was	O
designed	O
to	O
be	O
installed	O
in	O
branch	O
offices	O
,	O
stores	O
,	O
subsidiaries	O
,	O
etc.	O
,	O
and	O
to	O
be	O
connected	O
to	O
the	O
central	O
host	O
mainframe	O
,	O
using	O
IBM	B-Architecture
Systems	I-Architecture
Network	I-Architecture
Architecture	I-Architecture
(	O
SNA	O
)	O
.	O
</s>
<s>
Although	O
its	O
successor	O
's	O
role	O
in	O
distributed	B-General_Concept
data	I-General_Concept
processing	I-General_Concept
was	O
said	O
to	O
be	O
"	O
a	O
turning	O
point	O
in	O
the	O
general	O
direction	O
of	O
worldwide	O
computer	O
development	O
,	O
"	O
the	O
3790	O
was	O
described	O
by	O
Datamation	O
in	O
March	O
1979	O
as	O
"	O
less	O
than	O
successful.	O
"	O
</s>
<s>
up	O
to	O
two	O
dial-in	O
IBM	O
2741	O
communications	O
terminals	B-General_Concept
,	O
</s>
<s>
The	O
Macro	O
Assembler	O
ran	O
only	O
on	O
an	O
IBM	B-Device
mainframe	I-Device
and	O
then	O
the	O
compiled	O
and	O
linked	O
object	O
was	O
moved	O
to	O
the	O
3790	O
for	O
testing	O
.	O
</s>
<s>
The	O
3790	O
was	O
designed	O
as	O
a	O
departmental	O
processor	O
,	O
but	O
the	O
requirement	O
for	O
an	O
IBM	B-Device
mainframe	I-Device
development	O
environment	O
inhibited	O
adoption	O
in	O
its	O
target	O
market	O
of	O
mid-size	O
companies	O
.	O
</s>
<s>
DMS	O
later	O
became	O
Cross	B-General_Concept
System	I-General_Concept
Product	I-General_Concept
(	O
CSP	O
)	O
on	O
the	O
8100	B-Device
.	O
</s>
<s>
It	O
used	O
3790	O
hardware	O
but	O
its	O
software	O
made	O
it	O
a	O
dedicated	O
shared-logic	O
word-processing	O
system	O
which	O
could	O
support	O
a	O
dozen	O
or	O
more	O
word-processing	O
IBM	O
3732	O
terminals	B-General_Concept
,	O
which	O
were	O
derived	O
from	O
the	O
IBM	B-Operating_System
3270	I-Operating_System
family	O
of	O
terminals	B-General_Concept
.	O
</s>
<s>
Defunct	O
IBM	O
3777	O
terminals	B-General_Concept
which	O
had	O
been	O
returned	O
by	O
customers	O
were	O
re-engineered	O
and	O
equipped	O
with	O
a	O
specialized	O
word-processing	O
keyboard	O
,	O
and	O
shipped	O
back	O
to	O
other	O
customers	O
as	O
part	O
of	O
the	O
3730	O
word	O
processing	O
system	O
.	O
</s>
<s>
The	O
3730	O
could	O
be	O
connected	O
using	O
Systems	B-Architecture
Network	I-Architecture
Architecture	I-Architecture
to	O
a	O
central	O
mainframe	O
running	O
IBM	B-Application
DISOSS	I-Application
which	O
was	O
a	O
centralized	O
document	O
exchange	O
software	O
running	O
on	O
CICS	B-Application
.	O
</s>
