DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Montgomery Ward P800 alias TXI-8642A
| Date of introduction: | Display technology: | LED-modules + lens | |
| New price: | Display size: | 8 | |
| Size: | 5.9" x 3.5" x 1.4" | ||
| Weight: | 10 ounces | Serial No: | 37B-24919 |
| Batteries: | 4*AA | Date of manufacture: | year 1973 |
| AC-Adapter: | Origin of manufacture: | USA | |
| Precision: | Integrated circuits: | TMS0109 | |
| Memories: | |||
| Program steps: | Courtesy of: | Joerg Woerner |
This boxy calculator does not look like a Texas Instruments
product. To identify it you have to know something about the coding used by
Montgomery Ward:
Models starting with
 | TXI were produced by Texas Instruments |
| DAN were produced by APF |
| DNS were produced by National Semiconductors (later Novus) |
| GLE by Lloyd's |
If you look deeper into the calculator you'll notice that the
P800 is very similar to the TI-2500 Datamath.
The circuit diagramms look identical, the integrated circuit is either the TMS0109
borrowed from the TI-3000 or the TMS0103 found in the Bowmar
901B.
The keyboard is clearly identified as a standard Klixon™
product manufactured by Texas Instruments. The colour of the housing, the LED-modules and some
other details like the rubber feets are known from the Datamath calculator.
A similar calculator was sold by Longines Symphonette with the
Electronic Calculalator and by Radio Shack with the EC-200.
Don't miss the rare TXI-8661A based on the Exactra 23 calculator.
Datamath™ and Klixon™ are trademarks 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.