Fixing Decades Old Bugs in the HP-35 The original "Microcode-Level HP-35 Emulator" post seems to Be lost in the MSDN shuffle ...

An Arduino library that is an HP-35 emulator. The bulk of this code comes from an Instructables project where enurdag created an Arduino-based HP-35 emulator: https ...

The HP-35 calculator, first introduced by the Hewlett-Packard Corporation in 1972, provided the four functions of arithmetic, as well as the transcendental functions of trigonometry and logarithms, to ...

Fifty years ago, Hewlett-Packard introduced the first handheld scientific calculator, the HP-35. It was quite the engineering feat, since equivalent machines of the day were bulky desktop affairs ...