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Additional Pictures 

 

This Radio Shack EC-423 was manufactured in June 1988 by 
Inventa Electronics Corporation in Taiwan (Date code 06A8 » mth 06 yr 1988).

 

The printed circuit board (PCB) of the EC-423 is centered
around an unknown single-chip calculator circuit.

 Close-up view of the unknown single-chip calculator circuit.

 Close-up view of the PCB-Mark of a EC-423.


horizontal rule

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© Joerg Woerner, April 6, 2024. No reprints without written permission.