<s>
It	O
was	O
an	O
early	O
example	O
of	O
a	O
digital	O
real-time	B-General_Concept
computer	I-General_Concept
system	I-General_Concept
,	O
and	O
the	O
first	O
computer	O
produced	O
by	O
Elliott	O
Brothers	O
.	O
</s>
<s>
The	O
machine	O
used	O
16	O
bit	O
words	O
and	O
two	B-General_Concept
's	I-General_Concept
complement	I-General_Concept
binary	O
arithmetic	O
.	O
</s>
<s>
Read/write	O
memory	O
was	O
provided	O
by	O
a	O
bank	O
of	O
16	O
Williams	B-General_Concept
tubes	I-General_Concept
,	O
a	O
cathode	O
ray	O
tube	O
that	O
could	O
store	O
256	O
bits	O
of	O
data	O
–	O
the	O
total	O
memory	O
was	O
256	O
,	O
16-bit	O
words	O
.	O
</s>
