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National Semiconductor CM IV

The National Semiconductor CM IV is an arithmetic calculator with algebraic logic. It has an LED (light-emitting diode) display typical of calculators of this era. The power source is PP3 9V.

Facts at a glance:

FeatureValue
TypeArithmetic
LogicAlgebraic
Display typeLED
Length140mm
Width70mm
Power SourcePP3 9V

Replacements:

If you have a National Semiconductor CM IV that is no longer working, you can first try replacing the PP3 9V battery. 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