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Royal 90K (UA120)

Royal 90K
Image: Joe Haupt, CC BY-SA 2.0

The Royal 90K is an arithmetic calculator with 8 digits precision and algebraic logic. It has 5 functions, 19 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAAA. The calculator was manufactured in Japan.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions5
Keys19
Precision8
LogicAlgebraic
Display typeVFD
Length114mm
Width70mm
Power Source4xAAA
CountryJapan
Year introduced1975

Replacements:

If you have a Royal 90K 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