DATAMATH PICTURES

This Radio Shack EC-425 was manufactured in August 1974 by Texas Instruments (Date code 314 » wk 31 yr 1974.
The double-sided printed circuit board (PCB) of the Radio Shack EC-425 is centered around a TMS0120 single-chip calculator circuit.
Close-up view of the TMS0120 (TMS0720) single-chip calculator circuit.
Close-up view of the SN75493 Segment Driver.	Close-up view of the SN27423 Digit Driver.
Close-up view of the Bowmar Optostic 175 Twelve-Digit Calculator Seven-Segment display.