Date of introduction:  1982 Display technology:  LCD
New price:   Display size:  8
Size:  2.8" x 6.0" x 0.30"
 71 x 153 x 8 mm3
Weight:  2.8 ounces, 79 grams Serial No:  
Batteries:  2*LR44  Date of manufacture:  mth 11 year 1983
AC-Adapter:   Origin of manufacture:  Taiwan
Precision:  8  Integrated circuits:  NEC uPD1831G
Memories:  3    
Program steps:   Courtesy of:  Joerg Woerner

Hoffmann-La Roche, a Swiss multinational healthcare company, launched in 1981 during a press conference in a New York City the Fitness 3 program as segment of the Vitamin Education Program. The three parts of the Fitness 3 program were fitness, nutrition, and health. Fitness 3 was established when Hoffmann-La Roche received the results of a national/exercise survey conducted for them by a large market research firm. The study indicated that Americans have a great deal of interest in fitness and quality of life. However, their perceptions of the benefits and the meaning of exercise, a good diet, and health habits differ greatly from actual behavior in these areas.

Hoffmann-La Roche applied on July 13, 1981 for a trademark for the phrase FITNESS 3. We assume that the FITNESS 3 MICRO COMPUTER was related to the trademark.

Dismantling the featured FITNESS 3 MICRO COMPUTER manufactured in November 1983 by National Semiconductor in Taiwan reveals a printed circuit board (PCB) marked with 103C-12. Obviously a reference to the NS103A Data Checker introduced in 1980 and its sibling Novus Electronics NS101A sporting just one Memory.

Please find an overview of the PCB-Marks we discovered so far on Account Manager calculators.

Comparing the FITNESS 3 MICRO COMPUTER with the NS101A reveals two basically identical products with just cosmetic differences: The [1], [2] and [3] keys correspond to the [DEP/M+], [CHK/M-] respectively [BAL/MR] keys. The red [%] key is labeled CALORIC RATIO with the FITNESS 3 MICRO COMPUTER and even the [DS] key to toggle between two entry modes is still present:

Indicator (--) Floating decimal with manual insertion of the decimal using the [.] key
Indicator (AM) Add mode with the decimal automatically put in the dollars and cents position (0.00

The featured FITNESS 3 MICRO COMPUTER reveals a clean design centered around a NEC uPD1831G single-chip calculator circuit powered by two LR43 batteries. We located the uPD1831G chip in the Texas Instruments TI-18 calculator, too.

Learn more about single-chip calculator circuits used in Account Manager Calculatorss.

If you have additions to the above article please email:If you have additions to the above article please email:

Joerg Woerner, December 2, 2019. No reprints without written permission.