DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Longines Symphonette Electronic Calculator
| Date of introduction: | 1972 | Display technology: | LED-modules |
| New price: | Display size: | 8 | |
| Size: | 5.9" x 3.5" x 1.5" | ||
| Weight: | 10 ounces | Serial No: | 4579 |
| Batteries: | 4*NiCd AA | Date of manufacture: | year 1972 |
| AC-Adapter: | unknown | Origin of manufacture: | USA |
| Precision: | Integrated circuits: | TMS0103 | |
| Memories: | |||
| Program steps: | Courtesy of: | Peter Muckermann |
This boxy calculator does not look like a Texas Instruments
product.
Nevertheless
is the proof simple, just read the label on the back of the Electronic
Calculator carefully.
This Longines EC is once again a calculator using the famous
Texas Instruments Klixon™
keyboard technology.
This knowledge reveals Texas Instruments Incorporated,
Dallas immediately as manufacturer of the Radio Shack EC-200.
The main difference is the lack of the lens above the display to
magnify the size of the digits. This construction gives an idea of the date of
introduction about June to September, 1972.
A similar calculator was sold by Montgomery Ward with the P800.
Within few month this Electronic Calculator was replaced with a well know design. Don't miss the next Electronic Calculator based on the Datamath.
Klixon™ is a trademark of Texas Instruments.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.