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Radio Shack EC-425

Date of introduction:  1974 Display technology:  LED-stick 
New price:  $79.95 Display size:  8 + 2
Size:  6.3" x 3.1" x 1.5"    
Weight:  10 ounces Serial No:  10737
Batteries:  3*AA NiCd Date of manufacture:  wk 31 year 1974
AC-Adapter:  AC9130 Origin of manufacture:  USA
Precision:  8 digits Integrated circuits:  TMS0120
Memories:      
Program steps:   Courtesy of:  Peter Muckermann

This EC-425 distributed by Radio Shack (A Tandy corporation company) could be easily identified as a restyled SR-10. The LED display vary from calculator to calculator, this one uses a Bowmar Optostic.

The mold of the housing looks very similar to other restyled Wedge area calculators like the Montgomery Ward P200.



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

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