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Royal 91S (UA123)

Royal 91S
Image: Joe Haupt, CC BY-SA 2.0

The Royal 91S is an arithmetic calculator with 8 digits precision and algebraic logic. It has 9 functions, 27 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAAA.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions9
Keys27
Precision8
LogicAlgebraic
Display typeVFD
Length114mm
Width70mm
Power Source4xAAA
Year introduced1976
Year discontinued1976

Replacements:

If you have a Royal 91S 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 Royal