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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:  year 1973
AC-Adapter:  unknown Origin of manufacture:  USA
Precision:  8 Integrated circuits:  TMS0103 
Memories:      
Program steps:   Courtesy of:  Peter Muckermann

EC-200_1.jpg (23589 Byte)This boxy calculator followed the EC-100 and doesn't look like a Texas Instruments product. 

First_TI.jpg (52283 Byte)To identify it you should compare it with the Montgomery Ward P800 or the Longines Symphonette Electronic Calculator.

EC-200_2_SN4442.jpg (56517 Byte)If you look deeper into the calculator you'll notice that the EC-200 is very similar to the TI-2500 Datamath but uses an other calculator chip from the TMS0100 series. A later model with serial number A2043934 produced in 1974 uses a TMS0109 calculator chip.

This Radio Shack EC-200 is once again a calculator using the famous Texas Instruments Klixon™ keyboard technology.

EC-200_Switch.jpg (59513 Byte)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.

EC-200_Label.jpg (41840 Byte)Known serial numbers:

Serial Number Calculator 
MOS-IC
MOS-IC
Datecode
MOS-IC
ROM-Code
A2 4442 TMS0103 7307 ZA0067
A2 4801 TMS0103 7250 ZA0067
A2 9215      
A2 24407 TMS0109 7315  
A2 039058       
A2 043934       
A2 044598 TMS0103 7328  
A2 048739 TMS0103 7328  



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If you have additions to the above article please email: joerg@datamath.org.

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