<s>
The	O
Sharp	B-Device
EL-5120	I-Device
is	O
a	O
scientific	O
programmable	B-Application
calculator	I-Application
.	O
</s>
<s>
It	O
has	O
about	O
1	O
KB	O
of	O
total	O
RAM	B-Architecture
available	O
to	O
the	O
user	O
,	O
and	O
has	O
4	O
basic	O
operational	O
modes	O
:	O
</s>
<s>
Real	O
mode	O
:	O
it	O
is	O
the	O
basic	O
operational	O
mode	O
for	O
directly	O
performing	O
standard	O
algebraic	O
and	O
statistical	O
calculations	O
,	O
as	O
well	O
as	O
evaluating	O
user-defined	O
functions	O
and	O
numerically	B-Algorithm
integrating	I-Algorithm
them	O
.	O
</s>
<s>
NBase	O
:	O
can	O
switch	O
between	O
Binary	O
,	O
Octal	O
,	O
Decimal	B-Application
and	O
Hexadecimal	O
base	O
.	O
</s>
<s>
Program	O
mode	O
:	O
Here	O
the	O
user	O
can	O
enter	O
and	O
execute	O
short	O
programs	O
written	O
in	O
a	O
language	O
closely	O
resembling	O
a	O
cut-down	O
version	O
of	O
FORTRAN	B-Application
or	O
BASIC	O
.	O
</s>
<s>
Unlike	O
the	O
28	O
global	O
ones	O
,	O
using	O
these	O
local	O
variables	O
consumes	O
user	O
RAM	B-Architecture
.	O
</s>
<s>
1	O
and	O
2	O
variables	O
statistics	O
,	O
has	O
only	O
a	O
simple	B-General_Concept
linear	I-General_Concept
regression	I-General_Concept
analysis	O
.	O
</s>
<s>
File	O
"	O
saving	O
"	O
,	O
"	O
loading	O
"	O
and	O
"	O
deleting	O
"	O
from	O
the	O
small	O
user	O
RAM	B-Architecture
.	O
</s>
<s>
Numerical	B-Algorithm
integration	I-Algorithm
using	O
Simpson	B-Algorithm
's	I-Algorithm
rule	I-Algorithm
.	O
</s>
<s>
Uses	O
one	O
3V	O
CR2025	O
lithium	B-Language
battery	O
.	O
</s>
<s>
Programs	O
and	O
equation	O
files	O
eat	O
up	O
RAM	B-Architecture
quickly	O
,	O
especially	O
if	O
they	O
contain	O
local	O
variables	O
.	O
</s>
<s>
Lack	O
of	O
any	O
built-in	O
application	O
formulae	O
or	O
physical	O
constants	O
,	O
these	O
have	O
to	O
be	O
defined	O
and	O
saved	O
by	O
the	O
user	O
as	O
expression	O
and	O
local	O
variables	O
,	O
with	O
a	O
notable	O
expense	O
of	O
RAM	B-Architecture
.	O
</s>
<s>
The	O
programming	O
language	O
used	O
consumes	O
RAM	B-Architecture
too	O
quickly	O
due	O
to	O
weak	O
construction	O
,	O
lacking	O
a	O
proper	O
FOR-like	O
statement	O
and	O
thus	O
forcing	O
to	O
use	O
long	O
and	O
costly	O
LABEL	O
,	O
GOTO	B-Application
and	O
GOSUB	B-Device
statements	O
.	O
</s>
