EDF calculator by Texas Instruments

Date of introduction:  1979 Display technology:  LED-stick
New price:   Display size:  10 (8 + 2)
Size:  6.4" x 3.2" x 1.5"
 162 x 81 x 37 mm3
Weight:  8.5 ounces, 240 grams Serial No:  2378882
Batteries:  BP1A Date of manufacture:  wk 14 year 1980
AC-Adapter:  AC9131 Origin of manufacture:  Netherlands
Precision:  13 Integrated circuits:  TMC0501E, TMC0582, TMC0583, TMC0571, 2*TMC0598 
 TMC0540 (ZA5528)
Logic:  AOS - 8 Pending Operations, 9 ()    
Memories:  0-60    
Program steps:  480-0 Courtesy of:  Joerg Woerner

TI-58-EDF_Back.jpg (347191 Byte)The innovative TI-58 was the perfect base for a lot of customized calculators. This one was used end of the 70th by the EDF Group in France - a leading supplier of Electricity in Europe - to calculate the necessary energy to heat rooms and houses.

SSSM_EDF5_PCB.jpg (34800 Byte)SSSM_EDF5.jpg (33106 Byte)The idea behind these products was the novelty of the Solid State Software Modules with up to 5000 program steps. This software was written by the SW-engineers of the EDF SA company and programmed into the modules by Texas Instruments.

TI-58-EDF_PCB.jpg (427183 Byte)TI-58-EDF_1.jpg (68853 Byte)The customized keyboard hides most functions available on the standard TI-58 and allows only access to the basic calculation functions and the programmed functions of the EDF module. 
Dismantling the calculator reveals a standard TI-58 calculator manufactured in April 1980.

An almost identical Energy Calculator was sold by Sanilabel Belgium CV.

Compare it with a similar product by the insurance companies Agrippina, Allianz, LVM, Lloyd, Nordstern and Victoria or the CAL-Q-TAX calculator.

Another approach to customize a calculator could be found in the Goulds Pumpulator.

Tired from insurance calculators? View the USMC HARRIER calculator!

A colorful calculator appeared with the Pool Water Analysis module.


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Joerg Woerner, June 5, 2005. No reprints without written permission.