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National SemiConductor 4640

The National SemiConductor 4640 is a scientific calculator with unknown digits precision and RPN (reverse polish notation) logic. It has an unknown number of functions, 36 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:

Type Scientific
Functions unknown
Keys 36
Precision unknown
Logic RPN
Display type LED
Display size
Length 150 mm
Width 75 mm
Thickness 31 mm
Weight unknown g
Power Source Sealed battery pack
Original price unknown
Est. current value unknown
Year introduced
Year discontinued

See other calculators manufactured by National SemiConductor.