DATAMATH CALCULATOR MUSEUM
Montgomery Ward P800 aka 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 NiCd||Date of manufacture:||year 1973|
|AC-Adapter:||Origin of manufacture:||USA|
|Program steps:||Courtesy of:||Joerg Woerner|
This boxy calculator does not look like a Texas Instruments product. To identify it, you have to know more 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
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: email@example.com.
© Joerg Woerner, December 5, 2001. No reprints without written permission.