<s>
The	O
Elektronika	B-Device
MK-61	I-Device
is	O
a	O
third-generation	O
non-BASIC	O
,	O
RPN	O
programmable	O
calculator	B-Application
which	O
was	O
manufactured	O
in	O
the	O
Soviet	O
Union	O
during	O
the	O
years	O
1983	O
to	O
1994	O
.	O
</s>
<s>
The	O
MK-61	B-Device
has	O
105steps	O
of	O
volatile	B-General_Concept
program	I-General_Concept
memory	I-General_Concept
and	O
15memory	O
registers	O
.	O
</s>
<s>
It	O
has	O
a	O
ten-digit	O
(	O
eight	O
digit	O
mantissa	O
,	O
two	O
digit	O
exponent	O
)	O
green	O
vacuum	B-General_Concept
fluorescent	I-General_Concept
display	I-General_Concept
.	O
</s>
