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APF MARK 23 (Electronic Slide Rule Calculator)

APF MARK 23
Image: Joe Haupt, CC BY-SA 2.0

The APF MARK 23 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 9 functions, 20 keys, and a VFD (vacuum fluorescent) display. The power source is Sealed battery pack. The calculator was manufactured in Japan.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions9
Keys20
Precision8
LogicAlgebraic
Display typeVFD
Length159mm
Width76mm
Power SourceSealed battery pack
CountryJapan
Year introduced1974
Year discontinued1975

Replacements:

If you have an APF MARK 23 that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements:

See other calculators by APF