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.

Some of the greatest electronic calculators of all time, including the venerable HP-16C, included functionality to convert numbers between different bases. 3735928559 might not mean much in base 10, ...

It says a lot about me, I suppose, but when I was younger I thought a calculator-watch was possibly the coolest thing you could have on your wrist. Pro-electronics engineer David Jones obviously feels ...

Good grief – where does the time go? For months and months (and months) I've been meaning to write an incredibly interesting paper on Binary Coded Decimal (BCD). The strange thing is that a lot of ...

Remember those Casio scientific calculator watches? Yeah, yeah . . . we got roughed up for wearing one too. Anyway, engineer David Jones is launching a DIY site for building one using ...

Do you, like me, recall playing with some of the first personal computers? Of course we had machine code and assembly language to work with, but the first “high-level” language of any note was some ...

What do you do when your trusty, 45 year old calculator finally needs to be retired? If you’re a programmer with a knack for making things — like Simon Boak — you custom build a replacement. This is ...

What if your calculator could do more than crunch numbers? Imagine a pocket-sized device that not only solves equations but also doubles as a retro gaming console, a basic computer, and a platform for ...

If you thought the original calculator watch was nerdy, get a load of this DIY gem from designer David Jones. According to his website, the “uWatch” is the “world’s most powerful programmable ...

Hoboken, NJ, September 19, 2005 – Global publisher John Wiley & Sons, Inc., today announced the publication of the new book, "The Definitive Guide to How Computers Do Math: Featuring the Virtual DIY ...

Building a mechanical calculator for multiplication: DIY to CNC precision! Posted: February 2, 2026 | Last updated: February 2, 2026 Watch as a frustrating math problem inspires a creative journey ...