<s>
Core	B-General_Concept
rope	I-General_Concept
memory	I-General_Concept
is	O
a	O
form	O
of	O
read-only	B-Device
memory	I-Device
(	O
ROM	B-Device
)	O
for	O
computers	O
,	O
first	O
used	O
in	O
the	O
1960s	O
by	O
early	O
NASA	O
Mars	O
space	O
probes	O
and	O
then	O
in	O
the	O
Apollo	B-Application
Guidance	I-Application
Computer	I-Application
(	O
AGC	O
)	O
and	O
programmed	O
by	O
the	O
Massachusetts	O
Institute	O
of	O
Technology	O
(	O
MIT	O
)	O
Instrumentation	O
Lab	O
and	O
built	O
by	O
Raytheon	O
.	O
</s>
<s>
Software	O
written	O
by	O
MIT	O
programmers	O
was	O
woven	O
into	O
core	B-General_Concept
rope	I-General_Concept
memory	I-General_Concept
by	O
female	O
workers	O
in	O
factories	O
.	O
</s>
<s>
Some	O
programmers	O
nicknamed	O
the	O
finished	O
product	O
LOL	B-General_Concept
memory	I-General_Concept
,	O
for	O
Little	O
Old	O
Lady	O
memory	O
.	O
</s>
<s>
By	O
the	O
standards	O
of	O
the	O
time	O
,	O
a	O
relatively	O
large	O
amount	O
of	O
data	O
could	O
be	O
stored	O
in	O
a	O
small	O
installed	O
volume	O
of	O
core	B-General_Concept
rope	I-General_Concept
memory	I-General_Concept
:	O
72kilobytes	O
per	O
cubic	O
foot	O
,	O
or	O
roughly	O
2.5megabytes	O
per	O
cubic	O
meter	O
.	O
</s>
