<s>
The	O
TI-80	B-Device
is	O
a	O
graphing	B-Application
calculator	I-Application
designed	O
by	O
Texas	O
Instruments	O
in	O
1995	O
to	O
be	O
used	O
at	O
a	O
middle	O
school	O
level	O
(	O
grades	O
6-8	O
)	O
.	O
</s>
<s>
The	O
TI-80	B-Device
featured	O
a	O
48	O
x	O
64	O
dot-matrix	O
display	O
with	O
a	O
5	O
x	O
3	O
pixel	O
font	O
,	O
the	O
smallest	O
screen	O
of	O
any	O
TI	O
graphing	B-Application
calculator	I-Application
.	O
</s>
<s>
It	O
had	O
the	O
slowest	O
processor	O
(	O
980kHz	O
)	O
of	O
any	O
TI	O
graphing	B-Application
calculator	I-Application
.	O
</s>
<s>
The	O
first	O
revision	O
of	O
the	O
TI-80	B-Device
'	O
A	O
 '	O
contained	O
a	O
proprietary	O
Toshiba	O
T6M53	O
ASIC	O
while	O
subsequent	O
revisions	O
contained	O
a	O
Toshiba	O
T6M53A	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
TI-80	B-Device
had	O
the	O
processor	O
on	O
board	O
the	O
ASIC	O
,	O
unlike	O
later	O
calculators	O
like	O
the	O
TI-83	B-Device
,	O
TI-83	B-Device
Plus	I-Device
,	O
and	O
TI-84	B-Device
Plus	I-Device
which	O
had	O
separate	O
ASIC	O
and	O
processor	O
chips	O
in	O
certain	O
models	O
.	O
</s>
<s>
In	O
comparison	O
,	O
the	O
TI-81	B-Device
,	O
released	O
in	O
1990	O
,	O
featured	O
a	O
2MHz	O
Zilog	B-General_Concept
Z80	I-General_Concept
processor	O
.	O
</s>
<s>
However	O
,	O
the	O
TI-80	B-Device
did	O
feature	O
7KB	O
of	O
RAM	B-Architecture
(	O
compared	O
with	O
the	O
TI-81	B-Device
'	O
s	O
2.4KB	O
)	O
.	O
</s>
<s>
The	O
TI-80	B-Device
also	O
had	O
more	O
built-in	O
functions	O
than	O
the	O
TI-81	B-Device
(	O
such	O
as	O
list	O
and	O
table	O
functions	O
,	O
as	O
well	O
as	O
fraction	O
and	O
decimal	O
conversions	O
)	O
.	O
</s>
<s>
Like	O
the	O
TI-81	B-Device
,	O
the	O
TI-80	B-Device
did	O
not	O
feature	O
a	O
link	O
port	O
on	O
the	O
base	O
model	O
,	O
however	O
,	O
unlike	O
the	O
TI-81	B-Device
,	O
the	O
ViewScreen	O
variant	O
(	O
meant	O
for	O
use	O
with	O
TI	O
's	O
overhead	O
projection	O
units	O
)	O
did	O
.	O
</s>
<s>
The	O
TI-80	B-Device
was	O
the	O
only	O
graphing	B-Application
calculator	I-Application
to	O
use	O
2	O
CR2032	B-Algorithm
lithium	O
batteries	O
(	O
instead	O
of	O
the	O
standard	O
4	O
AAA	B-Algorithm
batteries	I-Algorithm
with	O
a	O
lithium	O
backup	O
battery	O
)	O
.	O
</s>
<s>
Since	O
its	O
release	O
,	O
it	O
has	O
been	O
superseded	O
by	O
the	O
superior	O
TI-73	B-Device
and	O
TI-73	B-Device
Explorer	I-Device
.	O
</s>
<s>
The	O
TI-80	B-Device
was	O
officially	O
discontinued	O
in	O
1998	O
,	O
when	O
it	O
was	O
replaced	O
by	O
the	O
TI-73	B-Device
,	O
however	O
,	O
production	O
continued	O
until	O
at	O
least	O
October	O
2000	O
.	O
</s>
