calculator.org

the calculator home page

Radio Shack EC-421

The Radio Shack EC-421 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 12 functions, 29 keys, and a VFD (vacuum fluorescent) display. The power source is 2xAA.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions12
Keys29
Precision8
LogicAlgebraic
Display typeVFD
Length133mm
Width76mm
Power Source2xAA
Year introduced1976
Year discontinued1978

Replacements:

If you have a Radio Shack EC-421 that is no longer working, you can first try replacing the 2xAA batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements:

See other calculators by Radio Shack