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:

Feature Value
Type: Arithmetic
Functions: 9
Keys: 27
Precision: 8
Logic: Algebraic
Display type: VFD
Length: 114mm
Width: 70mm
Power Source: 4xAAA
Year introduced: 1976
YearDiscontinued: 1976

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