<s>
The	O
TI-55	O
is	O
a	O
programmable	B-Application
calculator	I-Application
first	O
manufactured	O
by	O
Texas	O
Instruments	O
in	O
1977	O
.	O
</s>
<s>
It	O
is	O
programmable	B-Application
to	O
hold	O
up	O
to	O
32	O
key-codes	O
that	O
allow	O
the	O
user	O
to	O
repeat	O
simple	O
calculations	O
with	O
different	O
values	O
.	O
</s>
<s>
The	O
TI-55	O
II	O
with	O
LCD	B-Device
was	O
introduced	O
in	O
1981	O
,	O
but	O
,	O
like	O
many	O
other	O
Texas	O
Instruments	O
calculators	O
of	O
this	O
time	O
,	O
suffered	O
from	O
serious	O
keyboard	O
reliability	O
problems	O
.	O
</s>
<s>
The	O
TI-55	B-Device
III	I-Device
replaced	O
the	O
TI-55	O
II	O
in	O
the	O
USA	O
in	O
1986	O
.	O
</s>
<s>
Several	O
variants	O
of	O
the	O
TI-55	B-Device
III	I-Device
exist	O
.	O
</s>
