DATAMATH CALCULATOR MUSEUM
Radio Shack EC-200
|Date of introduction:||October 1973||Display technology:||LED-modules + lens|
|New price:||$89.50||Display size:||8|
|Size:|| 5.8" x 3.5" x 1.8"
148 x 88 x 45 mm3
|Weight:||7.4 ounces, 211 grams||Serial No:||A2 039058|
|Batteries:||4* AA or NiCd AA||Date of manufacture:||mth 11 year 1973|
|AC-Adapter:||unknown||Origin of manufacture:||USA|
|Precision:||8||Integrated circuits:||TMS0109 or TMS0103, 2*SN75491, 2*SN75492|
|Program steps:||Courtesy of:||Peter Muckermann|
boxy calculator followed the EC-100 and doesn't look like a Texas Instruments product.
To identify it you should compare it with the Montgomery Ward P800 or the Longines Symphonette Electronic Calculator.
If you look deeper into the calculator you'll notice that the EC-200 is very similar to the TI-2500 Datamath but uses with the TMS0103 an other member of the TMS0100 single-chip calculator circuit family. A later model with serial number A2043934 manufactured in 1974 uses a TMS0109 chip.
This Radio Shack EC-200 is once again a calculator using the
famous Texas Instruments Klixon™
The battery compartment of the EC-200 sports a small sliding switch to select between "RECHARGABLE NI-CD BATTERIES" and "ALL OTHER BATTERIES". This switch prevents the AC-Adapter from providing a charge to the batteries if the switch is set to "ALL OTHER BATTERIES".
With the EC-300 a great change in the design of the calculator happened.
Datamath™ and Klixon™ are trademarks of Texas Instruments.
Known serial numbers:
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.