<s>
Distributed	B-General_Concept
data	I-General_Concept
processing	I-General_Concept
(	O
DDP	O
)	O
was	O
the	O
term	O
that	O
IBM	O
used	O
for	O
the	O
IBM	B-Architecture
3790	I-Architecture
(	O
1975	O
)	O
and	O
its	O
successor	O
,	O
the	O
IBM	B-Device
8100	I-Device
(	O
1979	O
)	O
.	O
</s>
<s>
Distributed	B-General_Concept
data	I-General_Concept
processing	I-General_Concept
was	O
used	O
by	O
IBM	O
to	O
refer	O
to	O
two	O
environments	O
:	O
</s>
<s>
Years	O
before	O
open	B-Operating_System
systems	I-Operating_System
made	O
its	O
presence	O
felt	O
,	O
the	O
goal	O
of	O
some	O
hardware	O
suppliers	O
was	O
"	O
to	O
replace	O
the	O
big	O
,	O
central	O
mainframe	O
computer	O
with	O
an	O
array	O
of	O
smaller	O
computers	O
that	O
are	O
tied	O
together.	O
"	O
</s>
<s>
Hadoop	B-Application
adds	O
another	O
term	O
to	O
the	O
mix	O
:	O
File	B-Application
System	I-Application
.	O
</s>
<s>
Tools	O
added	O
for	O
this	O
use	O
of	O
distributed	B-General_Concept
data	I-General_Concept
processing	I-General_Concept
include	O
new	B-Operating_System
programming	I-Operating_System
languages	I-Operating_System
.	O
</s>
<s>
In	O
1976	O
Turnkey	O
Systems	O
Inc	O
(	O
TSI	O
)	O
/DPF	O
Inc	O
.	O
introduced	O
a	O
hardware/software	O
telecommunications	O
front-end	B-Architecture
to	O
off-load	O
some	O
processing	O
that	O
handled	O
distributed	B-General_Concept
data	I-General_Concept
processing	I-General_Concept
.	O
</s>
<s>
a	O
360/30	B-Device
.	O
</s>
