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Keystone SC 656

The Keystone SC 656 is a scientific calculator with algebraic logic. It has 18 functions, 30 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is Sealed battery pack.

Facts at a glance:

FeatureValue
TypeScientific
Functions18
Keys30
LogicAlgebraic
Display typeLED
Length152mm
Width81mm
Power SourceSealed battery pack
Year introduced1975

Replacements:

If you have a Keystone SC 656 that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current model as a replacement:

See other calculators by Keystone