<s>
The	O
IBM	B-Device
1710	I-Device
was	O
a	O
process	O
control	O
system	O
that	O
IBM	O
introduced	O
in	O
March	O
1961	O
.	O
</s>
<s>
It	O
used	O
either	O
a	O
1620	O
I	O
or	O
a	O
1620	O
II	O
Computer	O
and	O
specialized	O
I/O	O
devices	O
(	O
e.g.	O
,	O
IBM	B-Device
1711	I-Device
analog-to-digital	O
converter	O
and	O
digital-to-analog	O
converter	O
,	O
IBM	B-Device
1712	I-Device
discrete	O
I/O	O
and	O
analog	O
multiplexer	B-Protocol
,	O
factory	O
floor	O
operator	O
control	O
panels	O
)	O
.	O
</s>
<s>
The	O
IBM	B-Device
1620	I-Device
used	O
in	O
the	O
1710	O
system	O
was	O
modified	O
in	O
several	O
ways	O
,	O
the	O
most	O
obvious	O
was	O
the	O
addition	O
of	O
a	O
very	O
primitive	O
hardware	O
interrupt	B-Application
mechanism	O
.	O
</s>
