Introduced in 1974 by National Semiconductor. It could do the basic four arithmetic operations. It is of great interest however, as it like Hewlett Packard, was using the RPN notation, instead of the common algebraic notation found in most calculators. Decimal point hard coded to give two fractional digits. The calculator in build with a two chip set and one LED module of National Semiconductor:


Serial number: 051488 
Backside of the calculator 
Zoom in on the backside label 
Manual 
See also my Novus 650 inside page.