ELKA: 53
Last updated: 21-apr-2001

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Display ^

Internals: keyboard (reed-switches) ^

Internals ^
IC-layout (manufacturer unknown): ^
1+4. CM8002
2. CM503
3. CM504
5. CM501
6. CM502
7. CM7301

I.C. and tube-transistors ^

Label (bottom) ^

Exported by StHU ISOTIMPEX, Sofia
Tschapaev.Str. 51

Produced by ORGTECHNIKA-Werk, Silistra

Instructions ^

Keys:

Two memory-registers, each has it's own keys ^

Decimal-setting key ^
e.g.: [DP] [3] shows 3 decimals
By power-on gives the calc. a two-decimal setting
Max. 10 decimals with [DP] [.]

Percentage-key: ^
e.g.: 33 = ?% from 40
33 [/%] 40 [=] 82.5

Recall-key: ^
Recalls the last operand

 3-position rounding-switch: ^
Upper pos.: Rounding off upwards
Middle pos.: Rounding off 5/4
Lower pos.: Rounding off downwards

5-position memory-mode-switch: ^
Pos. 0: No auto-memory-mode
Pos. A: Store result in second memory
 (lower horizontal-bar-indication on most left display-tube when stored)
Pos. B: Store first operand in first memory
 (upper horizontal-bar-indication on most left display-tube when stored)
Pos. C: Store first operand in first memory and store result in second memory
 (upper and lower horizontal-bar-indication on most left display-tube when stored)
Pos. D: Store in second memory the number of times
first memory is approached with [M+] and [M-]

Remarks:

This is a fine and straight calculator, everything you need is situated
on this machine, some keys are really useful and interesting, like the [/%]-key.
The two memories with have their own keys are rather unique.
Division by zero and overflow shows a small dot on the second tube of the display (#16),
calculations can continue after a press on the [C]-key.