<s>
The	O
Victor	B-Device
3900	I-Device
is	O
the	O
first	O
electronic	O
calculator	O
to	O
have	O
been	O
built	O
entirely	O
of	O
integrated	O
circuits	O
(	O
ICs	O
)	O
.	O
</s>
<s>
For	O
its	O
era	O
,	O
the	O
3900	O
is	O
extremely	O
advanced	O
;	O
it	O
has	O
a	O
cathode	B-Device
ray	I-Device
tube	I-Device
screen	O
to	O
produce	O
a	O
5-line	O
display	O
,	O
has	O
separate	O
memory	O
for	O
storing	O
three	O
intermediate	O
results	O
,	O
supports	O
numerical	O
rounding	O
,	O
and	O
is	O
still	O
"	O
smaller	O
than	O
a	O
typewriter	O
"	O
.	O
</s>
<s>
That	O
year	O
,	O
the	O
tube-based	O
Sumlock	B-Device
ANITA	I-Device
,	O
one	O
of	O
the	O
rumored	O
UK	O
machines	O
,	O
had	O
reached	O
the	O
market	O
.	O
</s>
<s>
By	O
this	O
point	O
,	O
transistors	B-Application
had	O
begun	O
their	O
wholescale	O
replacement	O
of	O
tubes	O
.	O
</s>
<s>
Victor	O
was	O
concerned	O
that	O
the	O
delay	O
of	O
redesigning	O
it	O
with	O
transistors	B-Application
instead	O
of	O
tubes	O
would	O
once	O
again	O
allow	O
it	O
to	O
be	O
beaten	O
to	O
market	O
.	O
</s>
<s>
In	O
June	O
1964	O
the	O
company	O
had	O
successfully	O
produced	O
its	O
first	O
metal	B-Architecture
–	I-Architecture
oxide	I-Architecture
–	I-Architecture
semiconductor	I-Architecture
(	O
MOS	O
)	O
IC	O
design	O
for	O
the	O
military	O
,	O
and	O
soon	O
branched	O
out	O
to	O
similar	O
products	O
under	O
the	O
Milliwatt	O
Logic	O
product	O
line	O
.	O
</s>
<s>
He	O
was	O
aided	O
by	O
Jay	O
Miner	O
,	O
who	O
would	O
later	O
design	O
coprocessors	O
for	O
the	O
Atari	B-General_Concept
Video	I-General_Concept
Computer	I-General_Concept
System	I-General_Concept
,	O
Atari	B-Device
8-bit	I-Device
family	I-Device
,	O
and	O
the	O
Amiga	B-Device
.	O
</s>
<s>
Had	O
this	O
used	O
the	O
standard	O
solution	O
of	O
the	O
era	O
,	O
Nixie	B-Application
tubes	I-Application
,	O
105	O
would	O
have	O
been	O
needed	O
and	O
the	O
price	O
would	O
be	O
too	O
high	O
.	O
</s>
<s>
Friden	O
,	O
Inc	O
.	O
had	O
recently	O
introduced	O
a	O
system	O
using	O
a	O
small	O
cathode	B-Device
ray	I-Device
tube	I-Device
(	O
CRT	B-Device
)	O
display	O
.	O
</s>
<s>
The	O
ICs	O
were	O
much	O
more	O
complex	O
than	O
previous	O
designs	O
,	O
each	O
containing	O
about	O
300	O
pMOS	B-Architecture
transistors	I-Architecture
,	O
compared	O
to	O
earlier	O
designs	O
with	O
perhaps	O
12	O
to	O
20	O
.	O
</s>
<s>
By	O
this	O
time	O
,	O
several	O
other	O
electronic	O
calculators	O
had	O
entered	O
the	O
market	O
,	O
including	O
the	O
Friden	O
130	O
and	O
Olivetti	B-Device
Programma	I-Device
101	I-Device
.	O
</s>
<s>
The	O
display	O
is	O
a	O
small	O
cathode	B-Device
ray	I-Device
tube	I-Device
with	O
the	O
individual	O
digits	O
and	O
symbols	O
represented	O
by	O
physical	O
patterns	O
inside	O
the	O
tube	O
.	O
</s>
<s>
It	O
is	O
similar	O
in	O
concept	O
to	O
the	O
Charactron	B-General_Concept
.	O
</s>
