calculator.org

the calculator home page

APF MARK 84

APF MARK 84
Image: Joe Haupt, CC BY-SA 2.0

The APF MARK 84 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 5 functions, 19 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is PP3 9V.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions5
Keys19
Precision8
LogicAlgebraic
Display typeLED
Length131mm
Width66mm
Thickness24mm
Power SourcePP3 9V
Year introduced1977

Replacements:

If you have an APF MARK 84 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 APF