DATAMATH CALCULATOR MUSEUM
This Radio Shack EC-425 was manufactured
in October 1974 by
|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
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© Joerg Woerner, May 11, 2011. No reprints without written permission.