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Radio Shack EC-21 (Blackjack 21)

Radio Shack EC-21
Image: Joe Haupt, CC BY-SA 2.0

The Radio Shack EC-21 is an arithmetic calculator with 10 digits precision and algebraic logic. It has 6 functions, 23 keys, and an LCD (liquid crystal) display. Note: game

Facts at a glance:

FeatureValue
TypeArithmetic
Functions6
Keys23
Precision10
LogicAlgebraic
Display typeLCD
Year introduced1985

Replacements:

If you have a Radio Shack EC-21 that is no longer working, 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