Triumph-Adler 121C, EC 29

Serial number 65513900N, made in Japan
Accessories Pouch
Condition Absolutely excellent! 
Repairs, Comments
Acquired 13.1.2002
Type, Precision, Input mode Simple, 12 BCD digits, no exponent, Algebraic
Programmable No
Memory 1 summation register, not permanent. 1 register for constant arithmetic (Kin, RK)
Display 13 digit 7 segment green VFD (Vacuum Fluorescent Display), one digit used for sign/memory
Special features EX key swaps arguments. Switch settings:  
n Turns on a count number in the rightmost two digits which counts the numbers of calculations made
A Automatically adds results to the summation register
AM All entered numbers are divided by 100 for easier input of cash amounts
F Floating point mode
0..2 Fixed point mode with specified number of trailing decimal digits. Result is rounded. Does not limit the precision of the square root function!
%+-  % key used for normal percent calculations
TAX % key returns the value of the constants register (set by Kin) divided by 100
D% Needs more investigation: "A + B + %" returns -100*(1+A/B) but different things happen when substraction is involved.
MU % key calculates 100*T/(100+P) where T is the first number and P the second one.
Ie. "20 x 5 %" returns 19.0476. 
The formula can be interpreted as: What base price is needed if P percent added to it give a total result of T? This is sort-of a reversed percentage calculation.
PR Returns percentage of 2nd number with regard to first number. 
Ie. "40 x 20 %" returns 50 because 20 is 50% of 40.
Original Pricing, Production Unknown, TA Vertriebs GmbH, Nürnberg, Germany
Batteries 4x AA or external 6V DC power supply, minus on center
Dimensions Length 15cm, Width 8.6cm, Height 2.6cm
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