<s>
The	O
unit	O
features	O
a	O
blue-green	O
,	O
light-emitting	O
vacuum	B-General_Concept
fluorescent	I-General_Concept
display	I-General_Concept
(	O
VFD	O
)	O
.	O
</s>
<s>
The	O
display	O
device	O
itself	O
has	O
9	O
seven	B-General_Concept
segment	I-General_Concept
digits	O
,	O
8	O
of	O
which	O
are	O
used	O
for	O
numeric	B-Algorithm
output	O
,	O
the	O
9th	O
being	O
for	O
the	O
minus	O
sign	O
or	O
to	O
accommodate	O
a	O
space	O
for	O
6+2	O
scientific	O
notation	O
.	O
</s>
<s>
A	O
vacuum	B-General_Concept
fluorescent	I-General_Concept
display	I-General_Concept
(	O
VFD	O
)	O
is	O
a	O
display	O
device	O
used	O
commonly	O
on	O
consumer-electronics	O
equipment	O
such	O
as	O
video	O
cassette	O
recorders	O
,	O
car	O
radios	O
,	O
and	O
microwave	O
ovens	O
.	O
</s>
<s>
Due	O
to	O
limitations	O
both	O
in	O
working	O
with	O
rationals	O
and	O
the	O
display	O
,	O
only	O
3	O
digit	O
numerators	O
or	O
denominators	O
are	O
allowed	O
,	O
otherwise	O
the	O
value	O
reverts	O
to	O
floating	B-Algorithm
point	I-Algorithm
.	O
</s>
