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Stats...
| .. 1976 |
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400mm
380mm
125mm
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| ?
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| AC 220V, 50Hz
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Iskra 121
© Sergei Frolov
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The Iskra 121 was the first in a series of scientific calculators,
designed in the beginning of the 1970s. This series is began with
calculators Iskra 121, Iskra 122, Iskra 123, Iskra 124, Iskra 125. A
distinctive feature of calculators of this series - algebraic logic with
hierarchy of operations. That is, to calculate expression: 2 + 3 * 4 it
is not required to fulfil at first division, and then subtraction. The
calculator understands precedence of operations, for what the push-down
memory is used.
In addition to this, in calculators the scheme of blanking of
insignificant zeros both up to a comma, and after a comma is applied.
The calculator has two registers of memory for storage of numbers, and
the second register of memory has the key of automatic addition with the
register. Also, there is a key of calculation of the square root
and key of exponentation in the whole degree.
How to Calculate
This calculator has algebraic logic, but not brackets as in the Iskra 122, 123, 124
a * b + c * d = a [X] b [+] c [X] d [=]
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