<s>
The	O
NCR	B-Device
Century	I-Device
100	I-Device
was	O
NCR	O
's	O
first	O
all	O
integrated	O
circuit	O
computer	O
built	O
in	O
1968	O
.	O
</s>
<s>
The	O
615-100	O
Series	O
integrated	O
a	O
complete	O
data	O
processing	O
system	O
that	O
had	O
16KB	O
or	O
32KB	O
of	O
short	O
rod	O
memory	O
,	O
an	O
80-column	O
punched	B-Device
card	I-Device
reader	I-Device
or	O
paper	O
tape	O
reader	O
,	O
two	O
5MB	O
removable	O
disk	B-Device
drives	I-Device
,	O
and	O
a	O
600-line-per-minute	O
line	O
printer	O
.	O
</s>
<s>
The	O
system	O
could	O
be	O
provided	O
with	O
a	O
punched	O
paper	O
tape	O
reader	O
,	O
or	O
an	O
external	O
card	O
reader/punch	O
,	O
and	O
also	O
allowed	O
for	O
the	O
attachment	O
of	O
multiple	O
9-track	O
,	O
1/2	O
-inch	O
,	O
reel-to-reel	O
magnetic	B-Architecture
tape	I-Architecture
drives	I-Architecture
.	O
</s>
<s>
Two	O
more	O
disk	B-Device
drives	I-Device
could	O
be	O
attached	O
to	O
the	O
system	O
.	O
</s>
<s>
The	O
Model	O
655	O
disk	B-Device
drive	I-Device
used	O
a	O
removable	O
disk	B-Device
pack	O
.	O
</s>
<s>
The	O
magnetic	O
actuators	O
were	O
later	O
replaced	O
with	O
hydraulic	O
actuators	O
,	O
and	O
later	O
yet	O
the	O
hydraulic	O
actuators	O
were	O
replaced	O
with	O
voice	B-Device
coil	I-Device
actuators	O
.	O
</s>
<s>
In	O
1972	O
NCR	O
sold	O
its	O
disk	B-Device
drive	I-Device
business	O
to	O
Magnetics	O
Peripherals	O
,	O
Inc.	O
,	O
a	O
joint	O
venture	O
with	O
CDC	O
and	O
thereafter	O
used	O
disk	B-Device
drives	I-Device
from	O
the	O
joint	O
venture	O
.	O
</s>
<s>
The	O
NCR	B-Device
Century	I-Device
100	I-Device
supported	O
several	O
programming	O
languages	O
:	O
NEAT/3	O
(	O
National	O
's	O
Easy	O
Auto-coding	O
Technique	O
,	O
a	O
later	O
version	O
of	O
the	O
NEAT/1	O
language	O
that	O
ran	O
on	O
the	O
NCR	B-Device
315	I-Device
computer	O
system	O
)	O
,	O
COBOL	B-Application
,	O
FORTRAN	B-Application
,	O
RPG-II	O
,	O
NEAT/AM	O
,	O
and	O
BASIC	O
.	O
</s>
<s>
The	O
machine	O
used	O
ASCII	B-Protocol
8-bit	O
code	O
.	O
</s>
<s>
A	O
typical	O
hardware	O
configuration	O
consisted	O
of	O
a	O
panel	O
with	O
toggle	O
switches	O
and	O
lights	O
to	O
enter	O
the	O
boot	O
loader	O
,	O
a	O
Teletype	O
writer	O
to	O
input	O
operating	O
system	O
commands	O
,	O
a	O
punched	B-Device
card	I-Device
reader	I-Device
that	O
gravity	O
feed	O
the	O
cards	O
(	O
they	O
dropped	O
into	O
the	O
read	O
station	O
,	O
and	O
were	O
ejected	O
and	O
turned	O
180	O
degrees	O
and	O
then	O
placed	O
in	O
the	O
exit	O
hopper	O
)	O
,	O
two	O
655	O
disk	B-Device
drives	I-Device
,	O
and	O
a	O
printer	O
that	O
printed	O
about	O
600	O
lines	O
per	O
minute	O
.	O
</s>
<s>
The	O
Century	B-Device
100	I-Device
lacked	O
hardware	O
sense	B-Device
switches	I-Device
,	O
which	O
the	O
Century	O
200	O
had	O
.	O
</s>
<s>
Programs	O
that	O
attempted	O
to	O
access	O
sense	B-Device
switches	I-Device
on	O
the	O
Century	B-Device
100	I-Device
would	O
simply	O
halt	O
with	O
the	O
humorous	O
message	O
:	O
"	O
You	O
find	O
the	O
switches	O
,	O
and	O
I	O
'll	O
test	O
them	O
!	O
"	O
</s>
<s>
The	O
Century	O
50	O
was	O
slower	O
than	O
the	O
Century	B-Device
100	I-Device
and	O
only	O
had	O
16K	O
of	O
the	O
thin	O
film	O
rod	O
memory	O
.	O
</s>
