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Additional Pictures 

 

This Radio Shack EC-425 was manufactured in October 1974 by
Texas Instruments  (Date code 454 » wk 45 yr 1975.
The printed circuit board (PCB) of the Radio Shack EC-425
is identical with the PCB of the SR-10.

Close-up view of the TMS0120 calculator circuit and the four display drivers.


horizontal rule

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

© Joerg Woerner, May 11, 2011. No reprints without written permission.