<s>
The	O
PDP-14	B-Device
was	O
a	O
specialized	O
computer	O
from	O
Digital	O
Equipment	O
Corporation	O
’s	O
Industrial	O
Products	O
Group	O
designed	O
to	O
replace	O
industrial	O
level	O
relay	O
controls	O
for	O
machinery	O
and	O
machine	O
tools	O
that	O
performed	O
repetitive	O
tasks	O
.	O
</s>
<s>
The	O
PDP-14	B-Device
was	O
specifically	O
designed	O
to	O
be	O
the	O
first	O
level	O
of	O
factory	O
automation	O
,	O
functioning	O
as	O
a	O
programmable	B-Architecture
logic	I-Architecture
controller	I-Architecture
(	O
PLC	O
)	O
,	O
through	O
its	O
ability	O
to	O
communicate	O
with	O
a	O
standard	O
DEC	B-Device
PDP-8	I-Device
minicomputer	O
.	O
</s>
<s>
The	O
PDP-14	B-Device
was	O
designed	O
to	O
process	O
Boolean	O
equations	O
,	O
usually	O
expressed	O
as	O
“	O
ladder	O
diagrams	O
”	O
and	O
as	O
such	O
had	O
a	O
programmable	O
read-only	O
program	O
(	O
PROM	O
)	O
memory	O
.	O
</s>
<s>
Programs	O
were	O
developed	O
using	O
a	O
PDP-8	B-Device
then	O
tested	O
using	O
a	O
direct	O
connection	O
to	O
the	O
PDP-14	B-Device
.	O
</s>
<s>
The	O
PDP-14	B-Device
was	O
put	O
into	O
a	O
check	O
out	O
mode	O
where	O
instructions	O
were	O
provided	O
by	O
the	O
PDP-8	B-Device
.	O
</s>
<s>
Following	O
checkout	O
,	O
the	O
PDP-8	B-Device
provided	O
the	O
instructions	O
to	O
be	O
put	O
into	O
the	O
PROM	O
.	O
</s>
<s>
Later	O
versions	O
(	O
for	O
example	O
,	O
the	O
PDP-14/30	O
,	O
whose	O
instruction	O
set	O
was	O
not	O
binary	O
compatible	O
)	O
are	O
based	O
on	O
PDP-8	B-Device
physical	O
packaging	O
technology	O
.	O
</s>
<s>
There	O
also	O
was	O
a	O
PDP-14/35	O
and	O
a	O
lower	O
cost/reduced	O
I/O	O
capability	O
PDP-14/L	O
.	O
</s>
<s>
The	O
12-bit	B-Device
PDP-14	B-Device
could	O
hold	O
a	O
maximum	O
of	O
4K	O
words	O
for	O
instructions	O
.	O
</s>
<s>
The	O
PDP-14	B-Device
has	O
seven	O
12-bit	B-Device
registers	O
:	O
</s>
<s>
Among	O
the	O
PDP-14	B-Device
instructions	O
were	O
:	O
</s>
<s>
JMS	O
JuMp	O
to	O
Subroutine	O
at	O
the	O
address	O
specified	O
in	O
the	O
following	O
12-bit	B-Device
word	O
.	O
</s>
<s>
The	O
original	O
PDP-14	B-Device
required	O
that	O
programming	O
be	O
done	O
by	O
DEC	O
.	O
</s>
<s>
Subsequently	O
,	O
software	O
development	O
for	O
the	O
PDP-14	B-Device
was	O
done	O
on	O
another	O
system	O
,	O
the	O
PDP-8	B-Device
.	O
</s>
<s>
program	O
named	O
SIM-14	O
allowed	O
for	O
simulating	O
the	O
PDP-14	B-Device
.	O
</s>
