Longines Symphonette Electronic Calculator (TI-2500B)

Date of introduction:   Display technology:  LED-stick
New price:   Display size:  8
Size:  5.5" x 3.0" x 1.7"
 139 x 76 x 42 mm3
Weight:  6.7 ounces, 191 grams Serial No:  2500B313624
Batteries:  3*AA NiCd or 4*AA Alkaline Date of manufacture:  1973
AC-Adapter:  AC9130 or AC9120 Origin of manufacture:  USA
Precision:   Integrated circuits:  TMS0119
Program steps:   Courtesy of:  Joerg Woerner

This calculator sold by Longines Symphonette could be easily recognized as a Texas Instruments Datamath calculator. 

Compare-Back.jpg (51688 Byte)Compare-Front.jpg (52869 Byte)The main differences between the original and the badged calculators are the olive-green color of the housing, the grey keys and the Longines Symphonette label. 

A more detailed comparison between the seven known Datamath Versions could be found here. Currently three of them are reported to be sold under the Longines Symphonette label:

TI-2500 Version 1
TI-2500 Version 2

Datamath™ is a trademark of Texas Instruments.

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© Joerg Woerner, December 5, 2001. No reprints without written permission.