Royal 91S (UA123)
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 batteries.
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 batteries |
| Year introduced | 1976 |
| Year discontinued | 1976 |
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: