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Royal 81CS

The Royal 81CS is an arithmetic calculator with 8 digits precision and algebraic logic. It has 11 functions, 27 keys, and a VFD (vacuum fluorescent) display. The power source is 2xAA.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions11
Keys27
Precision8
LogicAlgebraic
Display typeVFD
Length152mm
Width76mm
Power Source2xAA
Year introduced1978

Replacements:

If you have a Royal 81CS 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 Royal