 | |
Stats...
| 1966
1967 |
|
500mm x
430mm x
250mm
25kg
|
| ?
|
| 127/220V, 50Hz, 40W
|
|
|
|
EDVM, EDVM-P
Electronic "Ten-Keys" Calculating Machine [-Punch]
The EDVM-P (electronic ten-keys computing machine - with Punch) was developed on the order
of military topographers. The production of EDVM began in 1967 by the Ufa instrument-making factory. This machine was the first Soviet electronic calculator capable of automatically calculating trigonometric functions. For its day it was quite a marvel - and, even at a whopping 25kg... small!
The EDVM operated with a natural comma, and handled positive and
negative numbers, automatically evaluating balance. It has 16 decimal
digits. Power supply - alternating-current mains 127/220V with frequency
50 Hz or 12V battery. Maximum power consumption from an alternating-current mains - 40 W.
This machine has a lot of design elements in common with the very first Soviet Electronic Calculator - the VEGA.
© Sergei Frolov
|
 |
Electronic "Ten-Keys" Calculating Machine.
Note the fascinating display and unusual keyboard layout.
|
|
Display
The EDVM and VEGA share the same display system. The VEGA was one of the very first machines to use a 7-segment electroluminescent display for showing its results, and this display was re-used on the EDVM. The display consisted of 6 groups of 3-digit display segments. Each segment could display three digits, or one digit and two special signs. Together, the 6 groups were ample to display the full 16 digit capability of the machine (as opposed to the VEGA's 8 groups and 20 digits).
This image, though grainy, shows the display as it appeared in operation. The insert is from documentation, showing the layout of the segments and the decimal.
|
Capabilities
Automatically computation of: addition, subtraction, multiplying,
division, accumulation, multiplying on a constant factor, division on a
constant factor, division on a constant factor, multiplying with
algebraic accumulation, division with algebraic accumulation;
rootsquaring; calculation of sine, cosine, arctangent; translation
radian in degrees, minute and second of an arc; translation of hours,
minutes and seconds per seconds of time (or degrees, minutes and seconds
per seconds of an arc); translation of seconds of time at o'clock,
minute and second (or seconds of an arc in degrees, minute and second);
entering a constant "pi".
The machine semi-automatically: powers numbers in any whole
degree, extracts the root of any whole degree, evaluates different
trigonometrical functions (tg x, ctg x, sec x, cosec x, arcsin x and so
on).
Maximum duration of operations:
|
Transmission from the register in the register and entering the Pi
number | 0.01 sec |
| Addition, subtraction and accumulation | 0.02 sec |
| Multiplying and division | 0.3 sec |
| Translation | 1.0 sec |
| Rootsquaring | 2.5 sec |
| Calculation of sine and cosine | 3.5 sec |
| Calculation of an arctangent at |X|<=1 | 5.4 sec |
| Calculation of an arctangent at |X|>1 | 9.3 sec
|
© Sergei Frolov / Evgeny Kanevsky
| |
Inside the beast. Compare with the VEGA's internals!
|
© Sergei Frolov / Evgeny Kanevsky
|  | Ferro-Transistor unit from the EDVM (made in 1967).
The center marking is "Military Acceptance"
|
|
During calculations, the accuracy of execution of each operation is
monitored. For approximated results, its rightmost digits are rounded off, and on
the indicator the "H" character (inaccuracy) is highlighted. If the
"H" character is absent, the result is exact to the limits of all the digit in the display (16 digits). In case of overflow of a bit grid on the indicator the "P"
character is highlighted.
Keyboard Layout
© Sergei Frolov
|  | The keyboard layout, from period documentation.
|
|
The keyboard consists of 32 noncontact keys: 13 - for entering numbers
(1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 00, [,], [/-/]), one key for bit reset
(PC) and 18 keys of operations:
- 4 arithmetic operations
- +H addition with accumulation
- square root
- trigonometric function
- translation
- constant Pi
- C Output Register S on the display
- K Ouptut Register K on the display
- Move number from K to P, saving contents of K
- The Reg S, move number from Register P to Register K, saving contents of Register P
- NS, Move number from Register N to Register S, saving contents of Register N
- SK, Move number from Register S to Register K, saving contents of Register S
- SKS, Exchange contents of Registers S and K
- SS, reset register S
- Rhombus, print/punch results of input data and calculations
How to Calculate
How to calculate on EDVM.
| a + b - d | = a [+] b [+] d [-] |
| a b f | a [+] b [X] f [X] |
| k a | k [KP] a [X] |
| k b | b [X] |
| k c | c [X] |
| ab + cd + ef | = [HC] [CC] a [+] b [X] [c] [+] d [X] e [+] f [X] |
| a / b | = [CC] a [+] [b] [-:-] |
| (a ^ 2 + b) * c | = a [PT] [X] b + c [X] |
| a - b * c | = b [+] c [X] a [OB] [-] |
Peripherals
The "-P" in the EDVM-P designation stands for "punch". This machine had peripherals! The amazing pictures you see here show the add-on punch device (and what a device!). I don't think I've ever seen anything remotely similar to this, before.
© Sergei Frolov / Evgeny Kanevsky
|  | The EDVM, connected through the interface unit to the punch device!
|
|
© Sergei Frolov / Evgeny Kanevsky
| 
| Probably an interface/controller for the punch unit.
Note the contemporary slide rule!
|
© Sergei Frolov / Evgeny Kanevsky
|  | The amazing "punch", close-up.
|
The Sigma 132 Prototype
The Sigma 132, shown here, is is an unreleased prototype styling variation of the EDVM.
© Sergei Frolov / Evgeny Kanevsky
| 
| Sigma 132 Prototype
|
|
|
