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Unisonic 840-E

Unisonic 840-E
Image: Joe Haupt, CC BY-SA 2.0

The Unisonic 840-E is an arithmetic calculator with algebraic logic. It has 7 functions, and a VFD (vacuum fluorescent) display. The power source is 4xAAA.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions7
LogicAlgebraic
Display typeVFD
Length127mm
Width76mm
Power Source4xAAA
Year introduced1975

Replacements:

If you have a Unisonic 840-E that is no longer working, you can first try replacing the 4xAAA 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 Unisonic