Details:

• The machine offers some Financial functions
• Vacuum Fluorescent Display
• Two OMRON integrated circuits: HD3687 and  an HD32614P  behind the display.
  (The codes 5M12  and 5L31 could be date codes referring to 1975)

The bottom of the machine shows a Triumph/Adler type indicator:  EC31

Usage:

• C:        Clears the input register and when pressed again clears the result register as well
• CM:     Clears memory
• Mout:   Copies memory contents to result register
• √:        calculates the square root of the vakue in the input register
• EX:     Swaps input and result register
• Kin:     Copies the displayed value into the constant memory
• RK=:   Adds the value in the constant memory to the input register

        Four sliding switches broaden functionality:

• “A”:     in A-position results of multiplication and division are automatically added in memory (*)  
• “n”:     In “n” position the number of operations +, -, X, :  are counted in digits 11 and 12
• “AM” “F” ...... 6”

• “AM”:      is intended for financial calculations. It always shows 2 digits behind the decimal point.  On input the
                decimal point isn’t  entered manually.  
                Example:  input of 12345 is shown as 123.45
• F            displays numbers with max resolution  of 12 digits
• 0 .... 6    determines the number of digits behind the decimal point

• “%+-”  .....  “PR”  determines operation of the % key:

• “±%”:     % calculation
• TAX :     Calculation of prices including tax with Tax percentage stored with “K-in”
                e.g.: store Tax percentage 12 with “K In”.  Then 100  ‘x’ ‘%’  ‘+=’  displays 112.
• Δ % :     Percentage difference between two numbers
                e.g.: 200 – 180 ‘x’ ‘%’  ‘+=’  displays 90
• MU :       Mark Up key which can be used to calculate the max. purchase price if gross margin and selling price are known
                e.g.: 100 ‘x’ 25 ‘%’  ‘+=’    displays 80
• PR :       Profitability Ratio
                e.g.:  100 ‘:’ 10 ‘%’ ‘+=’  displays 110

(*)  Remarks: An “M” in the left part of the display shows that memory does contain a value.
                       An arrow in the left part of the display indicates an overflow

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Serial number:

Built in:

Functions:

Power:

Market-introduction:

Production until:

Price:

65604914

1975/1976

Addition, Subtraction,  Multiplication,  Division, Square root

220V

1975 ?

1977  (Büromaschinen Lexikon  mentions this calculator in the 1976 en 1977 issue)

?