When it comes to simple math, you can always use your smartphone ... about the physical buttons and single-function design of a calculator that still makes it a useful item to keep in your ...

The early days of modern computing were downright weird, and the HP 9830B is a strange one indeed: it’s a gigantic calculator, running BASIC, on a CPU implemented over a dozen cards using ...

It also has an amazing number of applications including a complete symbolic math system ... And a calculator still makes a nice project. Not all homemade calculators are simple.