<s>
The	O
D-17B	B-Device
(	O
D17B	B-Device
)	O
computer	O
was	O
used	O
in	O
the	O
Minuteman	O
I	O
NS-1OQ	O
missile	O
guidance	O
system	O
.	O
</s>
<s>
The	O
complete	O
guidance	O
system	O
contained	O
a	O
D-17B	B-Device
computer	O
,	O
the	O
associated	O
stable	O
platform	O
,	O
and	O
power	O
supplies	O
.	O
</s>
<s>
The	O
D-17B	B-Device
weighed	O
approximately	O
,	O
contained	O
1,521	O
transistors	B-Application
,	O
6,282	O
diodes	O
,	O
1,116	O
capacitors	O
,	O
and	O
504	O
resistors	O
.	O
</s>
<s>
High	O
reliability	O
was	O
required	O
of	O
the	O
D-17B	B-Device
.	O
</s>
<s>
Reliability	O
of	O
the	O
D-17B	B-Device
was	O
achieved	O
through	O
the	O
use	O
of	O
solid-state	O
electronics	O
and	O
a	O
relatively	O
simple	O
design	O
.	O
</s>
<s>
Simpler	O
DRL	O
(	O
diode	O
–	O
resistor	O
)	O
logic	O
was	O
used	O
extensively	O
,	O
but	O
less-reliable	O
DTL	B-General_Concept
(	O
diode	O
–	O
transistor	B-Application
)	O
logic	O
(	O
which	O
provides	O
gain	O
and	O
inversion	O
)	O
was	O
used	O
only	O
where	O
needed	O
.	O
</s>
<s>
In	O
the	O
late	O
1950s	O
and	O
early	O
1960s	O
,	O
when	O
the	O
D-17B	B-Device
was	O
designed	O
,	O
transistors	B-Application
lacked	O
today	O
's	O
reliability	O
.	O
</s>
<s>
Reliability	O
was	O
also	O
enhanced	O
by	O
the	O
rotating-disk	B-Device
memory	I-Device
with	O
non-destructive	O
readout	O
(	O
NDRO	O
)	O
.	O
</s>
<s>
The	O
D17B	B-Device
is	O
a	O
synchronous	O
serial	O
general-purpose	O
digital	O
computer	O
.	O
</s>
<s>
Construction	O
(	O
arithmetic	O
unit	O
only	O
)	O
:	O
transistor-diode	O
logic	O
is	O
used	O
.	O
</s>
<s>
ofWords	O
Access(µs )	O
Rotating	O
disk	B-Device
2,688	O
5,000	O
avg	O
.	O
</s>
<s>
The	O
memory	O
storage	O
capability	O
consists	O
of	O
a	O
6000	O
rpm	O
magnetic	O
disk	B-Device
with	O
a	O
storage	O
capacity	O
of	O
2985	O
words	O
of	O
which	O
2728	O
are	O
addressable	O
.	O
</s>
<s>
The	O
outputs	O
that	O
can	O
be	O
realized	O
from	O
the	O
D-17B	B-Device
computer	O
are	O
binary	O
,	O
discrete	O
,	O
single	O
character	O
,	O
phase	O
register	O
status	O
,	O
telemetry	O
,	O
and	O
voltage	O
outputs	O
.	O
</s>
<s>
Special	O
features	O
of	O
the	O
D-17B	B-Device
computer	O
include	O
flag	O
store	O
,	O
split-word	O
arithmetic	O
,	O
and	O
minimized	O
access	O
timing	O
.	O
</s>
<s>
A	O
split	O
word	O
on	O
the	O
D-17B	B-Device
consists	O
of	O
11	O
bits	O
.	O
</s>
<s>
Minimized	O
access	O
timing	O
is	O
the	O
placing	O
of	O
instructions	O
and	O
data	O
in	O
memory	O
so	O
that	O
they	O
are	O
available	O
with	O
minimum	O
delay	O
from	O
the	O
disk	B-Device
memory	I-Device
.	O
</s>
<s>
This	O
software	O
was	O
programmed	O
in	O
assembly	O
language	O
into	O
a	O
D17	O
disk	B-Device
computer	O
.	O
</s>
<s>
The	O
MM	O
II	O
missile	O
was	O
deployed	O
with	O
a	O
D-37C	O
disk	B-Device
computer	O
.	O
</s>
