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National Semiconductor 99A

The National Semiconductor 99A is an arithmetic calculator with 8 digits precision and algebraic logic. It has 7 functions, 24 keys, and an LCD (liquid crystal) display. The power source is 1.5V mercury cell.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions7
Keys24
Precision8
LogicAlgebraic
Display typeLCD
Length101mm
Width61mm
Thickness6mm
Power Source1.5V mercury cell
Year introduced1980

Replacements:

If you have a National Semiconductor 99A that is no longer working, you can first try replacing the 1.5V mercury cell. 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 National Semiconductor