which was actually programmable using a built-in magnetic card reader. By comparison, the HP-15C was a pocket-sized scientific calculator with “built-in support for complex numbers, matrix math ...

When the band support on [David]’s Casio CFX-400 Scientific Calculator Watch finally broke ... The result of his endeavors was the µWatch, a programmable watch based on a PIC24 with both ...

Pictured above is the HP 12C Financial Programmable Calculator, available from the ... which is “HP’s longest and best-selling product, in continual production since its introduction in ...

[Piotr Patek] ran into this issue when he obtained an Elektronika MK-85 programmable calculator with a broken CPU. Unable to find a replacement, he decided instead to build a pin-compatible CPU ...

In 1976, Steve Wozniak sold his HP-65 programmable calculator for $500 to start a computer company with Steve Jobs. It wasn’t a huge sacrifice. As a calculator engineer at Hewlett-Packard ...