EKBM 24-71

Electronic Keyboard Computing Machine

This is the first calculator produced by the Svetlana (CBET/\AHA) factory. This factory went on to make the C3-Series machines. This machine has a similar display to the C3-07 (with rounded digits), and has a beautiful hermetic contact (magnetic) keyboard. The keyboard of the EKBM D3 is similar.

© Sergei Frolov The display. C3-07 shows similar display digits.

The calculator has only 15 keys, therefore there are special rules of operation on this calculator:

Addition, subtraction

The operation is entered after input of an operand.
The first adds with zero.

Example:

2 + 3 = 5	[2] [+=] [3] [+=] (5)
2 - 3 = -1	[2] [+=] [3] [-=] (-1)

Multiplying

After obtaining multiplicand the key is pushed [*/], the factor is entered and the key is pushed [+=].

Example:

2 * 3 = 6

[2] [*/] [3] [+=] (6)

Division

After obtaining divided the key is pushed [*/], the divider is entered and the key is pushed [-=].

Example:

3 / 2 = 1.5

[3] [*/] [2] [-=] (1.5)

Example of continuous calculation

[ (2 + 3) * 4 - 5] / 6 = 2.5

[C] [2] [+=] [3] [+=] [*/] [4] [+=] [5] [-=] [*/] [6] [-=] (2.5)

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© Sergei Frolov Backplate. The word on the bottom is "Leningrad"