IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This programmable handheld electronic ...

If you like Nixie tubes and/or DIY calculators, checkout this interesting talk from the HP Handheld Conference in Orlando last month by [Eric Smith] from Brouhaha and [John Doran] from Time Fracture.

Nerds of the world jump of happiness, for HP has brought the legendary HP 15C Scientific Calculator and the HP 12C Financial Calculator for the iPhone and iPod touch, complete with custom skins and ...

A year ago, I finally added an example of the very first handheld scientific calculator – the HP 35 – to my collection. If you don’t insist on a pristine unit, they can be had for quite reasonable ...

Today’s supply chain issues can make it hard to buy microcontrollers, or really any kind of semiconductor. But for those keeping retrocomputers alive, this problem has always existed: ancient ...

We take wireless charging for granted with many of the gadgets we use today, such as smartphones, among others. Four decades ago, electronics like calculators were relatively new inventions, and most ...

This device is part of a series that included the HP-31E, the HP-32E, the HP-33E, the HP-33C, the HP-34C, the HP-37E, the HP-38E and the HP-38C. Compare 1987.0435.09 (an HP-25) and 1987.0435.11 (an HP ...