Friden (Singer) EC 1117
Friden (Singer) EC 1117

Details:


This electronic calculator contains early Hitachi MOS LSI integrated circuits including a digital memory and a display of nixie tubes.

There is a mechanical construction to visualize the places of the decimal point and the thousands.  The electronic decimal point can be determined with the bottom rotary switch.  If during calculation an overflow arises this decimal point starts floating.



Usage:

Addition/subtraction:

Enter a number, then pushing  “ += “ adds the number to the result register.  “- =“ subtracts in the same way.

The “M1+” and “M1-”  key work similarly in memory.


Multiplication:

Enter the 1st number, push the “X” key, enter the 2nd number, push the “+=” or the  “- =“  key.


Division:

Similar to multiplication using the “:” key.



Function of some keys, switches etc.

Calculator InfoRepair information & pictures of internals
Front-right stack-3as.jpgKeyboard stack-s.jpgFront-left stack-2as.jpg
P1010040as.jpgP1010041a-s.jpg
P1010085as.jpg

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Assets: adverts, brochures, etc

Serial number:

Build in:

Functions:

Power:

Market-introduction:

Production until:

Price:


29447A

Ca. 1971 (20661 seems to be produced early 1971)

Addition, Subtraction, Multiplication & Division

220V

1971

1974

DM 1785 in 1973 (Source: BüromaschinenLexicon)