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===scientific and financial models===
Just like monochrome graphic calculators, HP scientific and financial calculators are also a big family of products sharing similarities while each product has its unique features.
Older models run on in-house developed 4-bit "Nut" processors. Some newer models have an unusual practice (especially for scientific calculators) that emulates the Nutprocessor via an ARM processor so technically speaking those calculator models are actually emulation boxes, while some other models use ASICs as their kernel.
==Casio==
